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Hammond Organ Service Manual - Early Models (A,B,C series, B3

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2. WR inv ava DES IER 2 TEE Rp T NY MIMD Set both the vibrato controls and all per cussion tablets to their OFF positions d Depress the swell pedal to the position of maximum volume Disconnect tone cabinet from console f Connect one end of a test lead to the 5th preset panel bus bar from the bottom g Place the organ in operation h Check the AC input voltage at the console preamplifier terminal board the voltage should be 117 volts or 234 volts Any variation of in put supply voltage will give a corresponding increase or decrease of reading as shown in Table V Check the output voltage of each coil assembly by touching the prod end of the test lead to each terminal in turn on the main gen erator terminal board The frequency numbers are not indicated For location of exact fre quency see figure 3 4 j Compare each voltage obtained with the appropriate voltage listed in Table V Do not try to adjust to these voltages unless the values deviate more than 30 percent 4 7 Ifit is ascertained tha
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10. 5 3 105105 631935 001 350 Ll 1dWY79 3510914 Ig sues OM oases BH 2 E NAS gt Wo wr ZS 40 3215 y Ey vane 1 12 Pins ELO AME 1 qae BISEWHD ATadnS HIMOA 3 68 NOTE THE FOLLOWING INFORMATION PERTAINS SPECIFICALLY THE MODELS B 3 amp C 3 HOWEVER DUE TO THE SIMILARITY OF THE CON SOLE MODELS IN THIS MANUAL MUCH OF THE INFORMATION WILL APPLY TO THEM ALSO TROUBLE LOCATION 3 1 TROUBLESHOOTING 3 2 GENERAL When troubleshooting use all of the aids included in this handbook block diagram figure 3 1 overall schematic figure 3 3 amplifier schematic figure 5 10 illustra tions of components figures 1 4 1 5 and 3 2 stage as shown in schematic figure 3 3 Make all capacitor checks with capacitor analyzer if available Always disconnect capacitors before making tests otherwise the readings will be affected by a possible shunt circuit Replace any capacitor which shows a deviation
11. NOLON Luvs BACK VIEW OF CHORUS GENERATOR NUMBERS SHOWN ARE FREQUENCY NUMBERS CHORUS GENERATOR MAGNET LOCATIONS 2 14 Figure 3 CONSOLE POWER WIRING Main and Chorus Generators Starting and Synchronous Motors A shaded pole induction motor is used for atarting the generator and is located at the right end of the generator as viewed from the back The rotor of this motor will slide endwise when current 15 supphed and engage a pimion on its shaft wath a gear on the generator driving shaft bringing the tone generator up to slightly greater than syn chronous speed When the organ is started the starting switch is turned on and held for about amp seconds while the starting motor brings the system up to speed The run switch is then turned on This switch simultaneously connects the synchronous motor and introduces resistor aeres with the starting motor Figure 1 thus reducing its driving power Wath a braking action of the synchronous motor and a loss of power of the starting motor the system slows to synchronons speed and the synchronous motor hegins to carry the load A period of abont 8 seconds should he allowed for this to take place after which the starting switch be released The starting switch springa beck to the off position and turns off the starting motor which 15 disengaged from the rotating shaft hy Spring It should he noted that the synchr
12. 38 539 777 3LON 598088 QNS 845 HAHO ifldNI 915 6 6 6 s 61 81 41 910 dev NO IL 3735 OL zl NINN HO LON Sv 0357 Say 35 3H1 131 ANNOYS 310502 ONNOWS BIW 345 3105 2 5702 1 5 2 LIND NOLLV38H3A38 OL LANE 580151538 22 3SION 2 S089 U 1 9 Gnansnray EE loswz2 wi ERE 2 d 92 2 ENO Wows 1YNDIS DAID 15 Niv5 9253 LNBW39Y 1030 AYOLIVISILVS 1 6204 BLON 0 209 8223 VIA 3 63 SWIOSNOD 001 NI 5 vv 93112345 SSN WO SOTIN TY Q000f Y 20 TY v XALO QV SION OV MHI4TIdINV OILYWAHOS S SUL j Asit Wan o ta ni 1 asite gt 3 64 SW IOSNOO 001 SAIHAS H3LLV I NI CASN HSLITIdWV OLLVIWSHOS VS bi
13. SIOVLIOA TW 9 9142 0 M31142 LAOO 04621 D e WALA HUM SAVIO 1 Sore z 1 mo ot Neale 3 45 Tan Noi 3125143228 sativa 7793912 ama 1 332 pe 272 20 Refe to card underside of bench for console installation and instruc nons CAUTION PACKING FOR MOVING OR SHIPMENT The Reverberation Umt must be locked before moving cabinet or unit otherwise delicate parts will be damaged because of bouncing of the three coil springs when hanging free To lock the Reverberation Unit insert screwdriver in stot at end of lock rod sbuwn Fig 1 and turn turn counteruckwise It cabinet has rear grile opening os provided in grille Gath to allow access to lock rod Never remove tubes from them sockets without frst turcing off pawer at console INSTALLATION Unlock Reverberaa n L nu by serong screwdriver in slot at und of lock shown and turning UA turn clock wise so that slat is vertical If cabinet har rc ir grille an opening is provided in grille h te allow ac
14. 20 11 4 staro lt ew ine it 1 3 acer Lo NE EC neyn 063900 QC c Vanes E Wt emeivemmenes e E n t m x i al ot ES 2 p yapay d i ong ame gt _ fal ATT BIS yel r P 1801 dang sod 3 54 P30 FRONT 110 FRONT IMPORTANT When cabinet ss to be shipped or moved from room tighten nuts at cach end of spring mounted amplilier to prevent damage Never remove tubes from thor sockets without first turning off power at console Always supply model designatian and aera number when wnting factory regard ing console of cabiaet This informa tion can be obtained rom nameplates INSTALLATION Set up cabinet for as follows 1 Loosen nut at each end vf amplifer amplifier floats freely on mounting springs Leave ch nut un stud with mt 1 16 clearance to chasse to loosen nuts may hum in tane cabinet In cas
15. PARTS LIST FOR EARLY CONSOLES BEGINS ON PAGE 6 23 PARTS LIST ON EARLY HAMMOND TONE CABINETS BEGINS ON PAGE 6 31 FIGURE 1 FRONT VIEW 3 WALNUT MUSIC PANEL 138295 BENCH ASSEMBLY MUSIC PANEL HINGES o PEDAL w1 TEH COVER MISIC PANEL HINGE SCREWS STRETCHER PAR FALLBOARS MOUNTING HOVEABLE PANEL MOUNTING BLOCK HARDWARE Screw STATIONARY TOP PANEL 0 Washer Seckwaahor ENDBLAGKS RIGNT HAND N ENDBLOCK SCREWS LEFT HAND LEG SCREW RIGHT KAND LEG E STATIONARY FRONT RAIL PEDAL CLAVIER COVER LEFT HAND NDELOCK NEEL REST MUSIC PANEL HEEL REST BRACKETS BROWNI WP PANEL HINGE LONG NUMAE AK PANEL HINGE LSHDRTI MACKEY MOUNTING DARE M FELT FOR MSIE Ede e MAMUAL BOLT 1 CABINET COVER ov WASHER 4 USED REAR COVER THUMESCAEW BRASS LOCKWASMER 14 USED PEDAL REAR COVER BUMPERS BLACKI PEBAL REAR COVER BUMPERS BROWNI 22 25 24 25 26 30 32 GENERATIA FILTER FILTER FILTER FILTER FILTER FILTER FILTER FILTER FILTEX FILTER FILTER FILTER FILTER FILTER FILER FILTER FILTER FILTER FILTER TRANSFORMER FRERUEMEY eS TRANSFORMER FREQUENCY RANSCURMER FRERUENCY TRANSFORMER FRCAUENCY TRANSFORMER FREQUENCY TRANSFORMER FREQUENCY TRANSFORMER FRERDENC THANS FORMER FRERUEM TRANSFORMER FREBUEMC TRANSFORMER FRERUENC TRANS FORMER FREBUENC TRANSFORMER FRERUEME TR
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17. E SECTION OF H PRE AML FIER acts emer weve AE z mul Hp enno 4 ill PLAYING on 5 2 pra 3 wor _ 5 em en p TES CONTACTS 1 medir NORMAL oer OUTPUT OF PEDAL SOLO UNIT AT 2 ONLY Ins MASTER 1 FREQUENCY FREQUENCY prom ux mets Hr MODEL P n FEB sas 1 CONTROL YO WARE PEGAL NOTE 560 FIGUREIB BLOCK DIAGRAM OF ORGAN MODEL B2 B3C 2C3RM2 OR WITH SELECTIVE VIBRATO SYSTEM ANO C MODELS NDT HAVE PERL SOLO UNIT 3 24 HOLVH3N39 0105 308v 0061 ON 2 2 7300 19 ION Menem i ia iS E iia RETIER 1 eomm T PY versati s ari IMS LO I wa 1219895 sna Lasu z M Due oq Somos Sg Go UJ
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19. input FRO ANAT Scanner FTO genes Dimes EH at ac tont A USED REVISED HATCHING TRANSFORMERS 3 HESTON ameoa rany wa ase lt o TAGES MEASURED METES ERR NTA BOOMS DUM PER VOLT METER PREAMPLIFIER MODELS B2 C2 21 2 CREAMER TIPE DEFE p 7 eer x w Bass CHANNEL TRANSFORMERS foni HET iue Fanar sey sees iri Sass VIEW OF AMPLIFIER HENRY dure ALL VOLTAGES ARE PROG GROUNE UNLESS BTHERWISE NOTED SLL VOLTAGES 74024 PEE VOLT METER FIGURE 22 POWER AMPLIFIER TYPE 15 usto in CODE A SERIAL NOS 30500 32015 rse d diu T 16812 a i Be md on 726 OF AMPLIFIER ALG ARE FEM GROUND UNLESS ETHUDNOSE UTES MEASURED w 24009 PEE VOLT METER SERES er p Ed fiet outeur Sieste Hav
20. C The manual chassis assembly Fig 1 wbich includes the upper and lower manuals and the preset panel has a terminal strip under each manual made up of 82 or 91 terminals depending on the generator being used to accommodate the frequencies from the tone generator assembly Each manual has 61 ptaying keys 9 preset keys and 2 adjust keys each of which operates nine small bronze contact springs with precious metal points See Figure 2 When a key is pressed these points make contact with nine busbars extending the entire length of the manual The busbars also have precious metal contact surfaces The nine contact springs under each key carry the nine harmonics of the particular note with which they are associated See Figure 3 and are connected by resistance wires to the proper terminals on the terminal strip Therefore all key contacts are alive whenever the generator running See schematic diagram of console Section 2 RESISTANCE WIRE CONTACT SPRING Figure 2 ACTUATOR FOR ONE KEY HARMONIC v AN J IU CONTACT SPRING HARMONIC STH HARMONIC ATH HARMONIC 2ND HARMONIC Fo BOTTOM ARRANGEMENT OF MANUAL CONTACTE Figure 3 2 17 2 18 When a playing key 15 pressed tts mne frequencies impressed on the nine busbars of the manual As there wires connected to these bus bars a pres
21. Toes 1 4 4 D 4 UT BLACK 10 3 0 BRO Q Ra TRRMULANT CENTROL BLACK TREMULANT SWITCH SWELL 1 Hz E Ima K REN XN GG 13 227323 IRANGE 11000700508 j warcasa GREAT MATCHING TRANSFORMER SWELL P PILOT LAMP MINIATURE BASE LEV 41 Pz PEDAL LAMP MEDIUM BASE low 150 259 Cup CONSENSEK 9S MFR Cig CONDENSER 600 O09 MED 200 23 NPD 200 D C 1 290 onus 2590 omas 5900 ones Rip RESTOR 5 050 omes 17500 omas HDRES 117000 16956 ames 1022 onus 80200 Quis 119200 Qmd amd 0195800 ones 182022 ame Ra RENTON 350 000 102002 18990 ames 740 owe zow ATO 9923 sar is ded EET EE IP 2 gc on 3 19 3 20 PEDAL SOLO UNITS CONCERT MODEL CONSOLES The Model RT Hammond Organ console is similar electrically to the Model CV coneole but differs in the following respects 1 The console woodwork 15 larger and somewhat different in
22. ime 2 ALL VOLTAGES APE FROM GAOUME UNLESS eTHERMISE 5 m R Moree wt se vormers wine FIGURE 4 POWER AMPLIFIER HR i See ar USED IN 49 TONE CAMME Pe NRL P SE THEE VIEW a im some MODELS RE CHORES ARE INSERTED WERE AND RESISTORS AND RIA ARE 7 m a 80888 880 E dU finds MERAL MO MAT mal reris 3 42 3 43 ov 0 595891 Od fi 60999 93 20005 TINTS 6666 20005 ON TYIW3S 0 H 4A2 09 06 062 iemod tI 242 04 05 ASTI seamed 11 SLANIGYD 3NOL NI CFSN NI 22607 OY 1242 OF 3955 2 90tt2 Ov 24 6351 65 396 0v H SS amp oN 9 06si2 vie 2018 33440 HIVI SAHO 9 9 57102 3210 33w345 80565 00565 Jag ok H Tu 54955 556155 Op WH I enor 9NI193NN03 304 9124
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26. SERVICE MANUAL MODELS INCLUDING A PARTS LIST A 100 AB BA BC BCV BV B2 B3 C CV C2 C 2G C3 D DV D 100 E G GV RT RT 2 RT 3 SAFETY NOTICE Great care has been tsken In the design end menufecture of this product to aseure that no shock hazard exists on any exposed motel parts Internal esrvica operatione can expose the technician to hezerdous line voltages end accidentally causa these voltages to appear on exposed matel during repair or reassembly of product components prevent this work on these products should only be performed by those who ere thoroughly families with the precautions necessary when working on this type of equipment To protect the user required that ali enclosure perte snd safety Intertocke be restored thelr original condition and tha fotlawing teste be performed before returning the produci to the awner efier eny service operation Plug the AC line cord directly Into line voltage AC receptacle do not uea isolation transtormer for this test and turn the product on Connect the network ehown below In with all exposed metel end known earth ground euch es water pipa or condult Use an AC of 5 000 ohms volt or higher sensitivity to measure the voltage drop the network Move the nel work connection to each exposed metal metel chasis ecrew heads knobs end contro shsfta eecutchson
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30. Witt Ti 2 LTD an 8 TENSION ADJUSTING NUT PEDAL KEYBOARD 05 2043 Figure 14 Preset Panel Models A AV BA BC CV D DV G RT The tone signals from the preset keys on both manuale are carried by color coded wires to the preset panei in the back of the console The preset pane 15 a set of nine bars wired to the taps on the matching transformer correspoading to different intensities of sound as shown by numbers stamped on the bars Each preset wire carrying single harmonic is fastened under screw on the bar which represents the desired intensity of that harmonic This is equivaient to setting a harmonie drawbar to the corresponding number When shipped each organ has its presets set up as shown in the booklet Creating Beautiful Tone Colors with the Harmome Drawbars which may be obtained free on request Preset combinations may be changed at will by removing the consoie back and foiiowing the directions on card inside This card is reproduced beiow Figure 15 Preset B 2 B 3 2 RT 2 AT 3 A 100 0 100 amp In these modeis the preset panel is divided into two sets nine bare each connected to a separate matching transiormer One setis used for the swell upper manuai 3nd the other for the great iower manual and pedals The preset panel on E is slightly longer than the
31. 1000 000000 6J7 635 SWELL LEVER amp BUSHING ASSEMBLY MODEL 100 100 060 029990 B2 C2 RT2 060 021406 TRIMMER 99 02146 PEDAL SWITCH ASSEMBLY 32PEDAL 1 2 3 4 5 MODELS D100 AND RT SERIES PEDAL SIGNAL 5 012 033530 BUSBAR CONTACTS PUSHER PINS 017 001746 ACTUATORS PEDAL FELT 042 030749 CINFORMATION ON 25 PEDAL PEDAL SWITCH ASSEMBLY IS FOUND ON PAGE 6 11 AMPLIFIERS MODEL 100 40 39 MODEL D 100 0 33 5 1 2 3 POWER TRANSFORMER 0 39 DOMESTIC 120V 60CY EXPORT 234V 50 60CY 003 036754 OUTPUT TRANSFORMER A0 39 003 024897 0 33 5 TREBLE T1 T3 003 025349 BASS 2 003 025346 FILTER CAPACITOR A0 39 DUAL 30MFD 450V A0 33 5 40 40 30 450 450 040200 ROOH 5 2 SWITCH 0 33 5 POTENTIOMETER 0 33 5 REV GAIN 2 676 000107 39 BALANCE 100 OHM 0 39 SIGNAL BALANCE 250 OHM AC PLUG 2 PRONG 0 39 5 PIN RECEPTACLE 0 39 005 020790 4 40 39 005 020864 VACUUM TURES 12AX7 ECC83 002 012301 6BQ5 002 006700 504 5 3 002 005201 1247 002 012300 12 amp 7 002 012302 10 TRANSISTOR AO 33 5 001 021070 REVERB AMPLIFIER HODEL 100 40 35 EARLY SERIES 126 000111 007 A0 44 LATER SERIES 1 POWER TRANSFORMER 0 35 0 amp 4 D
32. SAVY SJU ax PMS sz xv ds 243 uo 874 e eur Bursn si 814 si0j2hpuoo ut oq uwo saayvads o 3essooou 54250243 9 210 sioip duie oow d Tova 31049 CUm T4 EC Mog MONTI AS ou 5 2 2v EI 5 mis WO te 5 TTT RET TT TYE OT TITTY mos wos 2y amos 2w PE x lt 135 w 5 2 tano x MOUS i CH MOTTA ayes awe dude d s EMISIT EE ON VESTRI JININ 22985 jo x2W o amp n oaq 1 t 1 UT Ut 1906 02 SYaaVvads TECHNICAL SECTION MAIN GENERATOR GENERAL DESCRIPTION Each Hammond Organ console has a main generator within it and in some cases depending on the model a chorus ge
33. mA 4906 609L E E inus gem TW St DON O SOANS P Sang awy wya aO pr uem T Su3wwi3dS ONY w3inlawv 3 70 Figure 1 4 Rear View of Console 3 71 YOLOW lHVlS S13NSVNW 8939 55 48 Figure 1 5 Tone Generator 3 72 BUS BAR x MANUAL SHIFTER KEY CONTACTS 4 inb ERE n GUIDE LOCKING AND PLAYING STOP TRIP ASSEMBLY KEYS Figure 1 6 Manual Chassis Partially Disassembled Figure 1 7 Preamplifier 3 73 resistors differing by as much as 30 percent from their rated values TABLE RESISTOR COLOR CODE O Black 4 Yellow Brown 5 Green 2 Red 6 Blue 3 Orange 7 Violet 3 6 COIL MEASUREMENTS For the DC direct current resistance value of chokes and audio transformers refer to the appropriate circuit diagram An open winding in the choke or transformer will be indicated by no ohm meter indication Check
34. 35 35 as 5 3 38 5 n 5 so s saj o 2 47 sa 2 39 30 41 sa ao 0 si n 32 51 j n a sj sa 0 95 35 1 se e1 E 5 e Se n CM s D n mn Q 40 5 32 a n 42 a2 ot mu a re 4a 5 da aa ve n al s s 5 E c 49 5 5 aj E 50 55 5 a E n 3 Sroqunuey Number FREQUENCIES USED IX MANUALS figure 4 2 19 2 20 PEDAL SWITCH ASSEMBLY Figure 5 Pedal Switch Assembly All Models with 25 Hote Pedal Keyboard The peda switch shown in Figure 5 is similar in construction to the manuals except that only four busbars are included instead of nine Each of the 25 pedals ac
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36. Circuite Figure B thru 12 2 21 2 22 Switch Assembly RT 1 2 3 amp 0 100 2 224 Circuits Pedal Keyboard Models RT 2 RT 3 amp 0 100 Model E amp Frequency Chart Figure Pedal Keyboard Figure 14 PANELS Model BC 0 OV 6 2 24 8 2 8 3 2 RT 2 RT 3 4 100 0 100 Charts Figure 18 Matching Trensformere Preset Keys Preset Cradle Figure 18 TREMULANT A C 0 amp 6 Mode E Rhaostat Circuits Figure 7 thru 6 VIBRATO Vibrato Diagram Figura 1 Una Box Figura 2 amp Vibrato Swrtch Figure 4 Scannar Figura Schamatics Figure 8 thru 9 PERCUSSION Oparation gt Percussion Cut Off REVERBERATIOB lilustration Figura 1 5 2 Filing Adjustment Installation of S Cabinets Suggastions Earlier Tone Cabinets Self Contained Units ECNO eere 245 Eche Organ Kit Block Qiagrams Figure 1 amp 2 lastell Kit in Earty Model 6 amp Model Echo Kit Figure 5 8 Earphones SECTION III LIST OF ILLUSTRATION ANO ROEX Models A 8C 0 B 6 Wiring
37. Tanri 30103796 NOl wa 3923533 sx ONW __ i NO 1v33da3 3u 304 372v14323x NO iwa3gu3 33 204 312v1413233 1007 ENGUTJNNO2 X04 224143232 ONY ANDES atcere yae ONT Sirus roy amp means v EE E M a m om Me LE AMPLIFIER 4222262 Am ABOVE prd SEEOBAEN EE VOLUME TABLET 000024 000000 4 cis Jr MS jene os RESISTOR USED IN CORE PMPLIFIERS win 58 555 VEW OF AMPLIFIER AMPLIFIERS CONSOLE MAM NUMBERS xem FUNCRON PART Moc 2 55200 P nw se MODEL 433700 41509 2036 VOLTAGES MEASURED WITH 20000 OHM PER VOLT METER PREAMPLIFIER MODELS B2 CZAT Z 10 Qul NO ERAT saur 0888 ISP REACTOR S a 22 1 vota Tem eT E Ex MO ama na PET qu Gree f o WEE ET
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42. end measure the voltage drop the network Reversa the plug end repeat the measurements reading of 4 volts RMS more excessive and Indicates potentie shock hazard which must be corrected before returning the product to the user AC SCALE MWF CERAMIC RF BYPASS CAP TEST CLIPS CONNECTED TO NONN EARTR ERDUNG TU EXPOSED METAL PARTS TASLE OF CONTENTS NECTION GENERAL BRIEF OEXCBIPTION ANO SOME ILLUSTRATIONS OF THE FOLLOWING MOOEL ORGANY ANO TOBE CABIBETS ORGANY PAGE Models AB 1 Models 8C B 2 amp B3 Modal Rall Player Organ 1 2 C CV 2 0 amp 12 Models 6 2 26 36 Consoles 5 5 40 406 Tone Cabinets Model E Concert Modele RT RT 2 amp AT 3 Modala 4 100 0 100 Modal 4 20 Modal 4 40 Modal B 40 C 20 Model C 40 Model 0 20 Model ER 20 Model F 40 Modals H 40 HR 40 K 40 40 Model 38 20 aoe Model FR 20 Modal P 40 0 40 Modal 40 08 40 THEORY OF OPERATION Oesenption Preset Kays Pedal Pistons Model Console 1 15 Solo Unit Echo Swatch Tremulent Percussion Generator Tone Cabinets Rotor Power Amphifier Raverberation
43. 002 006305 6527 002 006502 REVERS AMPLIFIER USED IN MODELS OR ER FR TONE CABINETS 1 TRANSFORMER A0 16134 003 016134 2 COUPLING TRANSFORMER 0 16135 3 HEATER TRANSFORMER 0 16133 1 4 TUBES 6 75 617 000 000000 6 77 6587 002 006306 6507 002 006502 PLUGS AND RECEPTACLES OOE OGOLE 5 PIN RECEPTACLE 005 016032 6 PIN PLUG 005 016156 6 PIN RECEPTACLE WAFER 005 020757 6 PIN CONNECTOR WAFER TYPE 005 020758 7 PIN PLUG 005 016121 7 PIN 005 016126 CABLES AND CONNECTORS 1 5 CONDUCTOR CABLE 011 036408 2 BULK CABLE 5 CONDUCTOR SPECIFY LENGTH 200 000022 a CONNECTOR CONSOLE 4005 016018 CONNECTOR TONE CABINET END 005 016032 c CONNECTOR CAPS 4 USED 060 020560 6 CONDUCTOR CABLE NOT SHIELDED 30 511 017277 50 511 017277 050 100 511 017277 100 BULK CABLE 6 CONDUCTOR SPECIFY LENGTH 511 010298 a CONNECTOR PLUG 505 061721 b CONNECTOR SOCKET 504 029546 CONNECTOR CAP PACKAGE 2 USED 505 137457 AC LINE CORD CONSOLE TO WALL OUTLET 011 035752 SPEAKER REPLACEMENT IN EARLY TONE CABINETS USING ELECTRODYNAMIC SPEAKERS SPEAKER REPLACEMENT IN EARLE eee Electrodynamic speakere are no longer being manufactured They can be replsced with Permanent Magnet PM speakers in early Hemmond tone cabinets Good results will b
44. 48 3 4 WIDE SIZE 47 DEEP 46 NIGN FINISH WALNUT MODEL CV IN PRODUCTION SEPTEMBER 1945 TO DECEMBER 1949 SAME AS MODEL BUT EQUIPPED WITR HAMMOND VIB INCLUDING VIBRATO CHORUS FINISH WALNUT MODEL C 2 IN PRODUCTION DECEMBER 1949 TO DECEMBER 1954 SAME AS MODEL BUT WITH CONTROLS WHICH PRO VIDE VIBRATO ON EITHER OR BOTH MANUALS ALSO ADDITIONAL CONTROL FOR NORMAL OR SOFT OVERALL VOLUME FINISH WALNUT MODEL C 3 IN PRODUCTION JANUARY 1955 TO SAME AS MODEL C 2 BUT WITH HAMMOND PERCUSSION PEATURE FINISH WALNUT OAK LATER VERSION IN BOTH FINISHES LESS QUATREFOIL MODEL D FINISH MODEL DV MANUALS PEDAL KEYBOARD TONAL CONTROLS HOME MODEL XN PRODUCTION JUNE 1939 TO NOVEMBER 1942 SAME AS MODEL RUT WITH ONE ADDITIONAL TONE GENERATOR AND APPROPRIATE SWITCHING TO CREATE CHORUS EFFECT SIMILAR TO MODEL BC WALNUT SAME AS MODEL D BUT WITH HAMMOND VIBRATO IN CLUDING VIBRATO CHORUS SEE NONE PRODUCED KIT ADDED IN FIELD SWELL AND GREAT 61 PLAYING KEYS RACH 25 NOTE RADIATING DETACHABLE 9 PRESET KEYS AND 2 SETS 9 ADJUSTABLE HARMONIC DRAWBARS FOR EACH MANUAL 2 ADJUSTABLE DRAWBARS 16 AND 8 FOR PEDALS EXPRESSION PEDAL CONTROLLING SWELL GREAT INPUT WEIGHT AND PEDALS APPROXIMATELY 40 TO 60 WATTS PLUS WATYAGE RE QUIRED BY CABINETS AS ILLUSTRATED APPEOXIMATELY
45. 0 16134 1 003 016134 003 0 20927 1 003 036899 0 20927 2 0 20927 3 0 16681 5 0 16682 2 0 16134 1 003 016134 003 020927 4 A0 20927 5 0 20927 6 0 21106 1 0 16682 2 003 036899 0 20927 7 003 036899 0 20927 8 0 20927 9 0 21264 0 0 21106 3 003 021106 003 0 21268 0 0 16682 3 0 16134 2 003 016134 003 0 15 1 POWER TRANSFORMER 115V 60Hz 0 20927 10 115V 50 60Hz 0 20927 11 230V 50 60Hz 0 20927 12 2 OUTPUT TRANSFORMER TREBLE 0 21566 1 003 021566 001 BASS 0 16681 6 003 016681 006 3 FILTER CHOKES 2 5 HENRY 0 16682 5 15 HENRY 0 16682 4 003 016682 004 4 REVERB TRANSFORMER A0 16134 3 003 016134 003 0 40 1 POWER TRANSFORMER 115V 60Hz 0 23514 1 003 023514 001 115V 50 60Hz 0 23514 2 230V 50 60Hz A0 23514 3 2 OUTPUT TRANSFORHER TREBLE 0 21264 BASS 0 21106 6 3 FILTER CHOKES 6 HENRY A0 21268 1 18 HENRY A0 16682 3 SPEAKERS NOTE ELECTRO DYNAMIC SPEAKERS ARE NO LONGER AVAILABLE USE PART 014 021270 AS A REPLACEMENT ALONG WITH 250 OHM 10 WATT RESISTOR FOR THE FIELO COIL SEE PAGE 6 36 FOR MORE DETAILS MODEL JR20 HR40 KR40 H40 K40 10 6 8 014 021075 12 8 OHM 014 021270 8 MODEL PR20 15 4 OHM 014 0 28923 8 12 8 014 021270 MOOEL PR40 QR40 P40 Q40 15 4 014 023421 12 8 014 021270 56 625 6 6 002 006703 514 002 005201 6567 002 006306 65 7
46. INSTALLING IN MODEL CONSOLES in this modei the preamph ier is located so far from the hme panel that the blue green and biack wires from the echo panel must be extended to reach the preamplifier in addition the black and red cable wires must be extended to reach the echo panel Otherwise the installation may be made a described above ES FE e d n FRA t EE us re 5 WASTER FROM ECHO rur HH exi vo ri err FIGURE 3 SCHEMATIC DIAGRAM OF ECHO KIT WIRING r Note On consoles with siart and run swiiches in wood end block 8 3 C 3 and RT 3 increase this dimension to 3 17 32 MIU j 25 RIGHT END OF 5 5 MUSIC RACH BASE 32 pia FIGURE 4 HOLES TO BE PROVIDED FOR MOL NTING ECHO SWITCH INSTALLING KIT IN EARLY MODEL B AND BC CONSOLES WITH NO OUTLET BOX When installing an echo kit in one of these consoles it is preferable that an outlet box be installed the same a Order from the service department of Hammond Organ Co one out lei box with 6 conductor receptacle 2 conductor plug and mounting screws one 6 conductor plug and one plug cap stating the model and serial number of the console b Follow steps 1 2 3 and 4 above c Mount echo receptacle in outlet box see figure 5 Cut off 6 cond ductor cable to prop
47. 5 d i 12 cR 3 w DLS ra o Ss Sina SOLOW HOLIMS 2029 e sue x mor 5 VO n 5 2 eec WO Saat waq nos 4 cd eT eq Seg We SA ee am icoray N Y m Ti Wher ING Staley yO JO OD wale Gv etl BONO 40 ao 15 341514 ONOAWYN 9NIMIA Tole 86 0v SEPE Old 33 WIA omi 49 Soa 4 Downe 241022902 wi 2D Tat 2 3NO tut iirksttRltua ci DI EEE
48. TNS jina X 3r ose SET LS UH oyag SEN vos 5 m e WHINE DARD AR ART XXE mE DE LESS 14 E Power Amplifier 25 40 491 gt N 5 SEEKS E Oe gg A Se S 37938 UT PA Da ans 3 i m 5 pa sta 5 E 5 i m gt 5 ND qu pu Sa 20002 120082 Sunes i Bae E MN H MES Ds RES Uo COMO a E ves we Natya e e H GARG OL quede 820 53 77 95 S 39 ees N m E ov siv He 5 It pane an a ome E ae neum 51 4 EERE 12380 HSL Adang secure the generator assembly to the console
49. VIBRATO LINE BOX MODEL BV CV RT 2 2 2 121 021860 001 100 0100 121 000083 1 COIL MODEL B2 C2 RT2 003 021842 003 EARLY MODEL 100 0100 3 003 016924 001 LATER MODEL A100 D100 RT3 003 033303 VOLUME CONTROL ASSEMBLY RHEOSTAT BOX 1 CAM 5 045 002013 EXPRESSION PEDAL MODEL B2 RT2 123 000009 MODEL 2 4100 0100 3 123 000010 FOR ADDITIONAL INFORMATION SEE PAGE 6 15 OF B 3 C 3 PARTS LIST TABLE OF CONTENTS EARLY HAMMOND TONE CABINETS MAJOR ASSEMBLY TONE CABINET CROSS REFERENCE rowr AMPLIFIER G REVERB AMPLIFIER 6 PLUGS AND RECEPTACLES 5 CABLES AND CONNECTORS TNE PART INFORMATION FOR TONE CABINETS 15 BROKEN DOWN BY AMPLIFIER TYPE PLEASE REFER TO THE CROSS REFERENCE ON BACK OF THIS PAGE TO DETERMINE THE AMPLIFIER TYPE BEFORE PROCEEDING TONE CABINET CROSS REFERENCE SERIAL AMPLIFIER TYPE 1000 amp ABOVE F 2400 amp ABOVE 2400 to 19841 INCL 2400 amp 4348 to 25109 INCL 25110 to 26968 INCL 26969 amp ABOVE 15007 to 22399 22400 to 35303 35304 amp ABOVE ALL 27001 to 28709 37001 to 37659 37660 amp ABOVE 35001 to 35623 35425 amp ABOVE 35624 amp ABOVE ALL 55002 to 59999 50002 to 59999 K 6000 amp ABOVE LR 60660 amp ABOVE LR CODE 55002 to 56499 JR 50002 to 56499 K 56500 amp AROVE LR 80061 amp ABOVE LR CODE 3
50. CORENCTORS WEAR VIEW TYPE F POWER AMPLIFIER FIGURE it vor ue aw Ae wam tee me ws casera Dove SERAL Ente SARL Fa SERIAL NO yan iont Paat piar Haye fhe MEHAC NO TO ress CL oiL icc 60 21590 amruirier TuS SPEAKER INSOE VIEW OF AMPLIFIER ALL WOLTAGES ARE FROM GROUND UNLESS OTHERWISE NOTED ALL DC VOLIAGLS MEASURED WITH 20000 PER VOLT METER SOME RE CHOKES ARE INSERTED MERE AND RESISTORS AND KIZ ARE OMITTED Ys E OIL BLOCK 2590 0 19 50 ap I powek As 3 PEE FIGURE POWER AMPLIFIER H A WARD IN 5948 an TONE CABINETS Lj SERIAL NO 26265 ABOVE i NO Aow END 35628 AND ABV INSIDE VIEW ALL VOLTAGES ARE ROM GROUND UNLESS OTHTUWISE AIL VOLTAGES MEASURED WITH 20 000 OHM PIR MOLT METER 3 41 Li E SPEAKER
51. OVERALL VOLUME WALNUT TN PRODUCTION JANUARY 1955 10 SAME AS MODEL RT 2 WITH HAMMOND PERCUSSION FEATURE WALNUT CONCERT MODELS RT RT 2 AND 3 MANUALS PEDAL KEYBOARDS 1 PEDAL SOLO SYSTEM TONAL CONTROLS EXPRESSION AC INPUT WEIGHT SWELL AND GREAT 61 PLAYING KEYS EACH 32 NOTE CONCAVE RADIATING DETACHABLE BUILT TO ACO SPECIFICATIONS HAS PEDAL SOLO SYSTEM WITH SEPARATE VOLUME CONTROL PROVIDING FOLLOWING SOLO EFFECTS 32 FOOT BOURDON 32 BOMBARDE 16 SOLO 8 SOLO 4 SOLO 2 and 1 SOLO ALSO TABLETS FOR MUTE CONTROL AND PEDAL 9 PRESET KEYS AND 2 SETS OF 9 ADJUSTABLE MONIC DRAWBARS FOR EACH MANUAL FOR PEDALS TWO ADJUSTABLE DRAWSARS 16 AND 8 ONE EXPRESSION FEDAL CONTROLLING SWELL GREAT AND PEDALS APPROXIMATELY 110 TO 130 WATTS PLUS WATTAGE REQUIRED BY TONE CABINETS AS ILLUSTRATED APPROXIMATELY 525 POUNDS MODEL CABINET SIZE FINISH OUTPUT AC INPUT A 100 A 101 102 105 100 A 101 102 A 105 A 100 A 101 A 102 105 IN PRODUCTION 1959 1965 HOME STYLE CONSOLE SAME AS C 3 BUT WITH BUILT IN SOUND SYSTEM INCLUDING REVERB CONTROL IN PRODUCTION 1962 TO 1975 CHURCH STYLE CONSOLE SAME AS C 3 BUT WITH BUILT IN SOUND SYSTEM INCLUDING REVERB CONTROL WITH PEDAL KEYBOARD AND BENCH 47 12 WIDE 45 32 HIGH 43 DEEP SAME AS MODEL C
52. RED MAHOGANY LIGHT WALNUT BROWN MAHOGANY GRAY MAHOGANY BLACK LIGHT CHERRY DARK CHERRY LIGHT OAK DARK WALNUT 27 WATTS 2 AMPLIFIERS 3 12 SPEAKERS APPROXIMATELY 200 WATTS 1 4 MODEL D 100 CABINET SIZE FINISH D 152 0 155 OUTPUT AC INPUT WEIGHT 1 48 E n EVI cw IN PRODUCTION 1963 TO 1969 SAME AS RT 3 BUT WITH BUILT IN SOUND SYSTEM INCLUDING REVERB CONTROL SAME AS WALNUT OAK 50 WATTS AMPLIFIERS 2 12 SPEAKERS 2 18 SPEAKERS APPROXIMATELY 330 WATTS AS ILLUSTRATED APPROXIMATELY 543 185 MODEL 20 PRODUCTION OCTOBER 1935 JULY 1939 CABINET 27 WIDE 30 HIGH 15 DEEP SEE FINISH AMERICAN WALNUT WEIGHT 113 POUNDS OUTPUTs 20 WATTS 1 AMPLIFIER 2 12 SPEAKERS AC INPUT APPROXIMATELY 180 WATTS THIS SMALL DECORATIVE TONE CABINET IS USED FOR HOMES MORTUARIES AND SMALL CHURCHES SEATING NOT OVER 100 PERSONS WHERE A LIMITED AMOUNT OF POWER IS REQUIRED MODEL 20 TONE CABINET MODEL A 401 IN PRODUCTION OCTOBER 1935 TO OCTOBER 1947 CABINET 26 1 2 WIDE 28 HIGH 19 DEEP SIZE FINISH BLACK LACQUER WEIGHT 155 POUNDS OUTPUT 40 WATTS 2 AMPLIFIERS 12 SPEAKERS INPUT AFPROXIMATELY 360 WATTS A NON DECORATIVE DOUBLE SERENGTH CABINET DE SIGNED FOR USE IN BANKS FOUR OR MORE IN LARGE INSTALLATIONS WHERE THE CAUINETS CONCEALED MODEL A
53. The switch has one less contact in each position and so neither the vibrato line nor the vibrato switch 15 interchangeable with earlier types The preamplifiers are the same as those used with the circuits of Figures 7 and 8 The scanner has somewhat different wiring harness MODEL VIBRATO SYSTEM The vibrato system 1n the Spinet Model M Series is somewhat different from those described aboye The line box 15 slightly smaller the scanner is slightly different mechanically and a completely different switching mechanism 15 used A full description givea in the service books for these models Bato Sia THESE contacts THERE contacts DP TAS CONTACT OFF 155444 a EE at VIBRATO PHASE SHIFT LINE FIGURE VIBRATO SYSTEM SED ALL EV ev PCU Cv DV AMP RT CONSOLES contact oma 2 PHASE SWIFT LINE FIGURE 7 VIBRATO SYSTEM MOVEL CONSULES BELOW SERIAL 37001 NUMBER AVI BELOW SERIAL NUMBER TORY 2 35 2 36 DES oso IE E VR FIGURE 8 VIBRATO SYSTEM qms comamits AL mann arsos anaoa AGI Ta SALES SER
54. able that any or series cabinets be connected to the console ahead of any cabinets having type F type or type amplifiers in order that reverber ated mgnals may not enter the base amplifier channel Otherwise there may be objectionable irregularities in the response of the lower pedal notes Further information on the use of reverberation may be found in the section covering Acoustics FILLING AND ADJUSTMENT OF FLUID LEVEL When installing a reverberation umt or tone cabinet the damping fluid fur nished in bottles with the unit should be added with care following directions on the tone cabinet instruction card The level in the three long tubes 18 not critical for best damping it should be near the top but not high enough to spill 1f the unit 18 moved Enough fluid furnished to fill each tube to about inch from the top The short tube should be filled to exactly 3 1 4 inches from the top using the special suction buib supplied This amount of fluid gives the best rever beration effect for average conditions If acoustic conditions are very unusual or if an orgamst has a definite pref erence for greater or leas reverberation the level in the short tube may be set higher or lower Lower fluid level will give longer reverberation time and higher fluid level will give shorter time There 18 temperature effect due to change in viscosity of the fluid lower temperatures will shorten the reverberation time a
55. assemblies These bakelite gears rotate freely with the tone wheels on separate shafts and are connected to their respective assemblies by a pair of compression type springs The bakelite OME SIDE OF COIL GROUNDED gears are provided in 12 different sizes corres ponding to the 12 driving gears of different sizes Consequently 4 of the tone wheel subassem blies each containing 2 tone wheels operate at each of 12 different speeds Each driving gear with its associated bakelite gears and 4 tone wheels is contained in a separate compartment magnetically shielded from the rest by steel plates which divide the generator into a series of bins See figure 5 2 All four tone wheels in any one compartment run at the same speed 5 5 Each tone wheel is a steel disk about 2 inches in diameter and contains a predetermined number of high and low points on its outer edge See figure 5 1 Each high point is called a tooth There are 12 wheels with 2 teeth 1 wheel to operate at each of the 12 speeds reference paragraph 5 4 similarly 12 wheels each have 4 teeth 8 teeth 16 teeth 32 teeth 64 teeth and 128 teeth also 7 tone wheels have 192 teeth A 2 tooth wheel and a 32 tooth wheel form an assembly giving 2 frequencies 4 octaves apart The 4 and 64 tooth wheels COIL OUTPUT TERMINAL TOME WHEEL TONE GENERATOR CI com mp 1 BAKELITE GEAR DRIVING GEAR WHEELS BAKELITE GEAR
56. dicaled in figures 2 2 B and 2C This divider circuit is capable of operating satisfactorily with wide variations in voltage input frequency and values of components and therefore 15 remarkably stable and requires no adjustments Stop Tablets _ From preceding we see that whenever avy one of the three G pedals for instaoce is depressed the frequency dividers together with the oscillator provide a series of G notes in exact octave relations The particular divider whose output is to sound ts selecled by the stop tablets 2 1 4 8 16 32 BOMBARDE and 22 BOURDON Thus the stop tablets act as register controls to shift the pitch range of the pedal solo unit to five different positions two or more of these controls are turned on simul taneously composite tone wall be heard consisting of the output of several divid ers simultaneously sounding in their octave relations tablet is on when the while dot 15 visible Note With Regard To The 32 foot Stops In playing care must be exercised by the organist in using the 32 BOURDON and 32 BOMBARDE pedal stops They are useful in permitting fhe player fo obtain deep bass notes the second octave of pedals As the player descends into the first octave of pedals he will find that the A and pedals have a definite pitch like the higher pedais However below the pedal it becomes difficult to ascribe deftn ite pitch to
57. necessary to make the upper lever assembly level Then solder the wire to the small tube passing through the voice coil When only the upper or lower lever assembiy 18 replaced the wire need not he unsoldered but the upper level must be made level by ad justing the single tube reverberation unit OPERATION OF DRY TYPE A later reverberation device Figure 3 is an improved unit which employe dry damping means instead of the liquid previously used It has improved driver and pickup elements and has three transmission epringe instead of the one formerly used The device about fourteen inches high thirteen inches wide and two inches in depth 1 28 incorporated in the new PR 20 PR 40 and QR 40 tone ceahinets It 19 also supplied as part of a kit which is designed for inetellation in Spinet and Chord Organs In operation an electrical signal from an amplifier 18 applied to the driver unit in the reverberation device which then converts the electrical signal into mechanical energy which 1s fed into the three springs of different lengths The signal takes 1 22 second to traverse the shortest spring to the pickup which reconverts part of the energy to an electrical signal and reflects most of the energy back along the spring to the driver where again most of the signal reflected back along the spring to the pickup This transaction continues until the signal energy at the pickup 18 reduced to one millionth of its original v
58. the fluid level in the short tube ie left stant at the position recommended the tone cabinet instruction card and the switch is used to select the beat amount of reverberation for each installation The photograph of the reverberation unit Figure 1 shows a reverberation pre of the type used in for installation in some non reverberation tone cabinets In later reverberation type tone cabinets the power amplifier wired that this preamplifier ie unnecessary Amplifier circuits associated with the reverberation unit are shown in the section containing amplifier diagrams INSTALLATION OF FLUID TYPE In installations of tone cabinets using type F type and type H power ampli fiers only single reverberation unit is necessary for any installation regard leas of the number of tone cabinets used The reverberation unit 15 connected to the first power amplifier the one to which the console cable connects and the reverberated signal s supplied from that amplifier to additional cabinets exception occurs n the case of type HR 40 KR 40 and JR 20 tone cabinete which reverberated signal is available for additional cabmets because the separate bass and treble channels reverberation is desired on several H J or K series cabinets each must be equipped with a reverberation anit When two or more types of cabinets are ueed in installation it ia preter
59. 1s pushed to the left normal vibrato 16 obtained with the vibrato ewitch in positions 1 2 or 3 When the lever 1s pushed to the right a chorus or ensemble effect combining foundation organ tone with vibrato tone is obtained The center position of this switch 16 not intended to be used No harm will result from leaving the switch ths position but reduced volume will be obtained Models B 2 B 3 2 3 RT 2 RT 3 A 100 amp D 100 have the seleclive vibrato teature which makes tha vibrato effect availsble on either manual saparataly or on both together Two tilting tsblets Figure 3 control the vibrato for the two manuals while the rotary switch selects the degrees of vibrsto or vibrato chorus effect The Grest tsblet controls the vibrelo for the pedals as well as for the Great manual The vibrato is not present on modele having the tremulant PERCUSSION The Percussion feature Models B 3 C 3 RT 3 A 100 amp D 100 is controlted by tour tilting tablets Fig 8 at the upper right side of the manuals Percussion iS available only on the upper and only when the prasat key is deprassed The four tablets from left to fight select Parcussion on or off or soft Volume fast or elow Decay and second or third Harmonic tona quality Percussion tones are produced by borrowing the second or third har momc signal from the correspond ing manual drawhar emplifying 16 returning part of the signal t
60. 37 38 39 40 and 41 only a single active tone wheel is on each shaft If the 2 magnets associated with the dead notes are together tone wheel is probably jammed against the magnet tip To correct this condi tion proceed as follows a Loosen the set screw on the magnet to be adjusted then move the magnet back slightly 6 9 6 8 X BACK VIEW OF MAIN GENERATOR ANI YOLOW LUVLS YOLOW FRONT VIEW OF MAIN GENERATOR NUMBERS SHOWN ARE FREQUENCY NUMBERS Figure 3 5 Generator Magnet Locations 3 79 Do not twist it b Strike the proper playing key The note should now sound c To make the final adjustment strike and hold down the playing key for the note being adjusted Then tighten the magnet slightly in position and tap it gently until it moves close to the tone wheel to bring the intensity up to the intensity of the adjacent notes Tighten the set screw so that the magnet is held firmly in position SYMPTOM d Do not remove main tone generator assem bly from the console unless absolutely necessary Should this be necessary proceed as directed in paragraphs 5 63 to 5 71 inclusive 3 27 TROUBLESHOOTING CHART 3 28 The following troubleshooting chart contains general information to aid in the loca tion of trouble When the trouble stage is sec tionalized refer to Section V for deta
61. 5 38 Typical Circuit Before Pre amplifier 5 39 Lach voltage of predetermined frequency produced by the tone generator is connected to one or more key contacts When the associated playing key is depressed this voltage is impressed upon the bus bar and 15 carried through the pre set key switch to the preset panel The voltage is then fed to one of the several taps of the mix ing transformer which is associated with the manual being played From high impedance secondary of the mixing transformer this volt age combined with others which may be fed through simultaneously passes to one of the preamplifier input circuits Vibrato ON or OFF circuit 5 40 Power to operate the preamphilier and power amplifier i5 supplied through the switch circuit as shown in figure 3 3 5 41 Preamplitier Circuit Input 5 42 The sgnal from cach mixing transformer is sent to the Vibrato ON OFF tablet associ ated with Hs particular manual and ys then carried to the VIBRATO NO VIBRATO preamplifier depending on the position of the tablet 5 43 Phe circuits aje with one extra stage of amplification in the VIBRATO chaunel to compensate for the loss that occurs through the phase shift network and associated scanner The input tube V4 receives the signals from VIBRATO and NO VIBRATO cir cuits and further amplifies them The signal then is impressed on the LOUD
62. 620 watts input This is the maximum AC power which can be supphed through the console without damaging the console switch or wiring The name plate on each cabinet Shows its wattage rating If the tone cabinet power requirements exceed 620 watts some of the cabineta must be supphed from a aeparate AG source as indicated in figures 2 and 3 Figure 2 is the preferred method employing a relay to turn on the additional cabinets The relay must have a coil of the same voltage and frequency rating as the organ and must have contacts suitable for carrying the amount of power drawn by the additional cabinets Allen Bradley Bulletin 700 relays are suitable for this purpose and may be obtained from your electrical supplier When the AG power 1s supplied separately to additional cabinets as in figures 2 and 3 a 3 conductor cable 1s sufficient to carry the signal between cabinets DETAILED WIRING DIAGRAMS Figures 4 5 and 6 are detailed versions of figure 1 In figure 4 the console 18 connected to one tone cabinet having a single amplifier and figure 5 shows tions to a cabinet with two power amphfiers connected together by a 5 conductor coupling cable Additional amplifiers up to maximum of 620 watts AC input may he connected as shown in figure Figure 7 18 a detailed diagram of the arrangement in figure 2 The 3 conductor cable carries signal all cabinets while each cabinet has its own AC power cord In this the 6
63. A chart is shown in Figure 1 giving the area of tone opening required to furnish one second reverberation time when the voiume of the chamber is known This chart 15 for chambers with dimensions m the ratio of 2 3 4 1 2 only however in practice the areas of tone opening shown are generaliy satisfactory The tone opening should be located m the largest wall surface of the chamber if possible and preferably near the center of the wall area INSTALLATION AND MAINTENANCE The organ must be connected to regulated frequency source of the voltage and frequency specified on the name plate If the frequency 15 not regulated the pitch of the organ will be irregular When a console 15 set up for operation the anchoring must be loosened so that the generator will float freely on its spring suspension system No damage will result 1f this is not done but the console will sound noisy and the same 18 true f the anchoring is loosened but the console 15 not level If the console is to be moved a long distance the anchoring should be tightened during such moves Several different types of anchoring have been employed and instructions loosening and tigbtening the generator in any particular console are given on the instruction card contained in tbe bench which accompanied that console Each power amplifier bas anchoring which sbould be loosened on installation and tightned for shipping If the cabinet has a reverberation unit it sbould be loc
64. CABINET WITH PEDAL KEYBOARD 57 WIDE 46 7 8 HIGH SIZE 47 5 8 DEEP FINISH WALNUT MANUALS SWELL AND GREAT 61 PLAYING KEYS EACH PEDAL 32 NOTE CONCAVE RADIATING DETACHABLE BUILT KEYBOARD TO AGO SPECIFICATIONS TONAL 9 PRESET EUTTONS AND 2 SETS OF 9 ADJUSTABLE HAR CONTROLS MONIC DRAWBARS FOR RACH MANUAL FOR PEDALS 4 NUMBERED AND LABELED TOE FISTONS 2 ADJUSTABLE DRAWBARS 16 AND 8 AND GREAT FEDAL 8 COUPLER EXPRESSION 2 EXPRESSION PEDALS ONE FOR SWELL AND ONE FOR GREAT AND PEDALS VISUAL POSITION IN DICATORS OF SLIDING ROD TYPE SEPARATE ADJUSTABLE TREMULANTS FOR SWELL AND GREAT MANUALS STANDARD MAIN 4ND CHORUS GEN ATOR UNITS ON AND OFF SWITCH FOR CHORUS FEATURES AC INPUT APPROXIMATELY 50 WATTS PLUS WATTAGE REQUIRED BY TONE CABINETS APPROXIMATELY 579 1 85 WEIGHTS AS ILLUSTRATED MODEL RT CABINET SIZE FINISH MODETL RT 2 FINISH MODEL RT 3 FINISH PRODUCTION JULY 1949 TO SEPTEMBER 1949 EQUIPPED WITH HAMMOND VIBRATO PROVIDING THREE DEGREES OF TRUE VIBRATO AND AN OFF POSITION EFFECTIVE SIMULTANEOUSLY ON BOTH MANUALS TO GETHER WITH VIBRATO CHORUS USABLE IN THREE DIFFERENT DEGREES AND WITH PEDAL KEYBOARD 47 5 8 DEEP 57 WIDE 46 7 8 WALNUT IN PRODUCTTON NOVEMBER 1949 TO JANUARY 1955 SAME AS MODEL RT BUT WITH CONTROLS WHICH PRO VIDE VIBRATO ON RITHER OR BOTH MANUALS ALSO ADDITIONAL CONTROL FOR NORMAL OR SOFT
65. CONTROL INPUT FROM SWELL MANUAL TO PRE AMPLIFIER MATCHING TRANSFORMER SWELL 105 GREAT RHEOSTAT MEG TO PRE AMPLIFIER GREAT TREMULANT CONTROL GREAT TREM SWITCH ON MAN GEN CIRCUIT OF RHEOSTAT BOX MODEL E CONSOLE FIGURE 2 31 2 32 THE HAMMOND VIBRATO TRE HAMMOND VIBRATO Hammond Organ consoles equipped with vibrato differ from tremulant models 14 the omission of the tremulant switch tremulant control and non vibrato preampiifier and in the addition of the vibrato line box scanner vibrato switch and vibrato preamplifier Three degrees of vibrato are available and 4150 different degree of chorus or celeste effect with each of the three degrees of vibrato Console models with the suffix 2 and 3 in their mode designation have the selective vibrato feature with tliting control tablets permitting the player to place the vibrato effect on either manual or both PRINCIPLE OF OPERATION The vibralo effect is created by a periodic raising and lowering of pitch and thus is fundamentally different from tremolo or loudness variation lt is comparable to the produced when violimst moves his finger back and orth on a string while playing varying the frequency while maintaining constant volume SECTIONS OF VIERATO LINE OF PREAMPLIFIER TO SECOND perc Fig 1 FUNDAMENTAL DIAGRAM OF
66. Connections from the pedals to the manual are indicated in Figure 12 A low voltage line from the pre amplifier heater transformer operates the 2 5 volt pedal preset indicator lamps through the external contacts on the pedal switch Severalfilter chokes and resistors mounted on the pedal switch are wired series with leads from the lower pedal harmonics Harm 6th Harm 8th Harm 10th Harm 12th Harm 16th Harm 5 gt gt Frequency Number Pedals 26 tg 32 Used In Modei RT RT 2 RT 3 amp D 100 Only For Barmonics Used In a Given Console See Fla 8 9 10 11 12 FREQUENCIES USED IN PEDAL SWITCHES Figure 13 2 23 2 24 Busbar Shifters Pedal switches in all consoles except Model A consoles below serial number 995 are equipped with busbar shifters similar to those on the manuals The pedal busbar shifter is a slotted stud on the rear surface of the pedal ewitch near the left end as you look in at the back It should be adjusted as described under Manual Busbar Shifters on a previous page Pedal Keyboard Pedal keys are at the factory for average tension but adjustable to fii the requirements of the individual organist Adjustment is accomplished by removal of the top cover at the back of the pedal keyboard sod setting the tension nuts as desired l swir CH PUSHER PARAN A
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68. GUIOED THROUGH THE HOLE OF THE SCANNER HOUSING TO SEPARATE THE MOTOR ANO SCANNER REMOVE TWO SCREWS FROM THE REAR COVER OF THE SCANNER BEFORE REMOVING THE COVER NOTE THAT THERE IS A SHIELDED WIRE ATTACHED TO THE COVER THIS WIRE IS CONNECTED INSIDE THE SCANNER AND THERE IS VERY LITTLE SLACK IN THE WIRE REMOVE THE COVER AND TIP IT BACK CAREFULLY SO YOU CAN SEE INSIOE LOCATE THE CARBON BRUSH AUDIO PICK UP ASSEMBLY J THE CARBON BRUSHES MUST BE REMOVED BEFORE THE MAIN HOUSING ASSEMBLY COVER M 15 52491 IN ORDER TO PREVENT DAMAGE TO THE CARBON BRUSHES ANO TENSION SPRINGS LIFT BRUSH AND SLIP THE TWO CARBON BRUSHES OFF THE ROTOR CONTACT PIN BE EXTREMELY CAREFUL OF THE ROTOR CONTACT PIN DURING DISASSEMBLY SO YOU DO NOT BEND OR BREAK THE PIN 7 8 9 10 12 13 14 SHOULD IT NECESSARY REMOVE THE CARBON BRUSH AUDIO PICK UP ASSEMBLY J DESOLDER THE AUDIO WIRE FROM THE BRUSH ASSEMBLY AND THE Two 2 screws 10 RE MOVE THE END BRUSH 1 REMOVE SCREW L ANO SEPARATE FROM THE BRUSH ASSEMBLY REMOVE THE FOUR 4 SCREWS AND SLIP THE HOUSING COVER OFF THE MAIN ASSEMBLY NOTE MARK THE HOUSING COVER AND THE MAIN ASSEMBLY CHASSIS U TO INDICATE THE START ING POINT OF THE SCANNER CABLE ALSO MARK THE LOCATION OF THE CABLE CLIP 0 STATIONARY PLATES AND ROTOR 0 ARE MOUNTED ON THE MAIN ASSEMBLY CHASSIS U REMOVE TWO 2 oF THE STATIONA
69. SECTION OF MAIN GENERATOR Figure 5 1 Construction of Main Generator 4 AND 64 16 AND BLANK 4 AND 64 16 AND 192 4 AND 64 16 AND BLANK AND 64 LS T 16 AND 192 A wm 4 ANO 64 16 AND BLANK 2 AND 32 8 AND 28 2 AND 32 8 AND 128 8 AND 128 2 AND 32 2 AND 32 8 AND 128 2 AND 32 8 AND 128 2 AND 32 Ses 8 128 2 2 AND 32 8 128 2 AND 32 8 AND 128 2 AND 32 I6 AND 192 AND 128 So Ys NOTE NUMBERS REFER THE NUMBER OF 5 TEETH ON EACH TONE WHEEL LJ t W Lec Figure 5 2 Tone Wheel Tooth Count in Generator are assembled together as are the 8 and 128 tooth wheels and the 16 and 192 tooth wheels Five 16 tooth wheels are mounted with blanks to maintain the balance of the rotating unit See figure 5 2 Only 91 frequencies are re quired for the organ for identification purposes these frequencies are numbered 1 to 91 inclusive 5 6 A magnetized rod about 4 inches long and 1 4 inch in diameter is mounted near each tone wheel See figures 5 1 and 5 2 A small coil of wire is wound near one end of the magnet The tip of the magnet at the coil end is ground toa sharp edge and mounted near the edge of the associated tone wheel Each time that a tooth of the wheel passes the rod the magnetic circuit changes and a cycle of voltage is induced in t
70. SPRING LONG ee 012 035754 SHORT 3 WHITE PEDAL ASSEMBLY ALL EXCEPT 10 C D Hi E F G 050 035756 4 DOWNSTOP FELT 4 HOLE 2 USED 6 HOLE 6 USED 042 002666 8 HOLE 4 USED PARTS INFORNATION ON 25 PEDAL KEYBOARD IS FOUND ON PAGE 6 10 OF B 3 C 3 PARTS LIST MATCHING TRANSFORMER MODEL 100 0100 RT3 003 022020 PRESET PANEL SEE PAGE 6 13 OF B 3 C 3 PARTS LIST GENERATOR 1 FLYWHEEL COUPLING SPRING 2 USED 012 002345 2 GEARS COUPLING SPRING 012 031463 3 COUPLING DRIVE 5 064 035768 SER PAGES 6 6 AND 6 22 OF THE B 3 C 3 PARTS LIST FOR ADDITIONAL INFORMATION PREAMPLIFIER NOTE PARTS INFDRMATION FOR THE PREAMPLIFIER 9 USED ON MODELS 100 D100 AND IS FOUND ON PAGES 6 11 AND 6 12 OF THE 3 3 PARTS LIST VIBRATO LINE TRANSFORMER MODEL BV CV RT 003 016906 001 VIBRATO OUTPUT TRANSFORMER BV CV RT 003 016906 002 MEATER TRANSFORMER MODEL 003 016907 001 MODEL 003 017831 001 FOR 56 57 PREAMP OUTPUT TRANSFORMER MODEL E OR 56 57 003 017826 MODEL AV BV BCV RT 003 016906 002 MODEL B2 C2 RT2 003 024895 POWER TRANSFORMER MODEL B2 C2 RT2 003 021414 001 POTENTIOMETERS CONTROL MODEL A B C D G BV CV RT 1 MODEL E DUAL 100K MODEL B2 C2 RT2 300 676 000126 VACUUM TUBES 56 57 6547 002 006502 6SN7 002 006306 6567 002 006305 647
71. Table indicates all key uumbers and notes aud the corresponding fre quency numbers for each drawbar 3 18 Return the first brown drawbar to its original position and then pull ont the last white drawbar ouly in the same drawbar set Refer ence paragraph 3 16 Start at the second note frequency No 61 and strike each higher note on the upper manual in succession until the second note from the top of the keyboard is reached This note corresponds to fre quency 91 the highest frequency produced by the generator Note the frequency number of all weak or dead notes 3 19 Repeat the procedures of paragraphs 3 15 to 3 18 inclusive on the lower manual Use the No 1 brown and No 9 white drawbars in the first set of drawbars in the right haud drawbar group 3 75 Note D E F CH gt 9 eu feine Bega TABLE FREQUENCY NUMBERS ASSIGNED TO KEYS AND PEDALS Frequency number assigned to keyboard harmonics Drawbar Drawbar 2 Drawbar Drawbar 4 Drawbar 5 Drawbar 6 Drawbar 7 Drawbar8 Drawbar 9 subfund Sub 3d fund 24 harm 4th harm Sth harm 6th harm 8th harm TABLE FREQUENCY NUMBERS ASSIGNED TO KEYS AND PEDALS Continued Frequency number assigned to Keyboard harmonics Drawbar Drawbar 2 Drawbar Drawbar 4 Drawbar 5 Drawbar 6 Drawba
72. Uv ON USED IN ALL VIBRATO CONSOLES MODELS AV BV BCY CV NAME PART ML VOLIAGES ERON GADUMP UNLESS OTHERWISE NOTED DV AND AT WITH 26 000 JeMS PERVERT SUPUT ML VOLTAGES MEASURE m QUUM Im HEATER 230V soeacy EATER ancy RESISTORS RESISTANCE Ters Prat m wama 4032 0 GONTROL HEATERS 6 3 15 MEG 82 1157 14 Filament transformer 17826 0 USED 1N MODEL E CONSOLE SERIAL NO 8000 TO 472 INCL 5 Output transformer 17831 1 DUAL CONTROL 1MEG 16532 PRE AMPLIFIER FIGURE 7 E 5 z 5 t TONE CONTROL cus mA 4 5 va 09 15 30 000 E E S z 5 i 8 000000000 225 4 0 Outpat Transformer 17826 0 T5 Filament Transformer AO 17831 1 Dual Control 1 16333 0 USED IN MODEL E CONSOLE SERIAL NUMBER 173 4561 INCL PRE AMPLIFIER FIGURE 8 7 3 y 2 5 gt i EI 52 es 380 7 400 9 afe z gt aN 1 s du 1 MEG ee nere 5 52 M Ro 50 050 4 400 INPUT ic NL ae 115 3 cap 9 8 USED IN MODEL CONSOLE T 4
73. VIBRATO EQUIPMENT The Hammond Organ vibrato equipment see simplified block diagram Fig 1 varies the frequency of all tones by continuously shifting their phase It includes phase shift network or electrical time delay composed of a number of low pass filter sections and capacity type pickup or scanner which is motor driven so that it scans back and forth along the line Electrical waves fed into the line ere shifted in phase by each line section the amount per section being proportional to frequency so that at any tap on the line the phase is retarded relative to the previous tap The scanning pick up traveling along the line will thus encounter waves in creasingly retarded in phase at each successive tap and the signel it picks up will contmuousiy change in phase The rate at which this phase shift occurs will depend on how many ime sections are scanned eech second Since a cycle is equivalent to 360 electrical degrees a frequency shifl of one cycle occurs for each 360 electricai degrees scanned per second For example if the scanner passes over the line 2t such a rate that 3600 electrical degrees are scanned each second there will be a frequency change of 10 cycles For the widest vibrato the whole line is scanned from beginning to end in about 1 14 second and this rate of change of phase causes about 1 1 2 decrease in frequency Note that the frequency remains constantly 1 1 2 iow as long as the moving pick
74. WITH CONTROLS WHICH PRO VIDE VIBRATO ON EITHER OR BOTH MANUALS ALSO ADDITIONAL CONTROL FOR NORMAL OR SOFT OVERALL VOLUME IN PRODUCTION DECEMBER 1949 TO DECEMBER 1954 WALNUT MODEL B 3 IN PRODUCTION JANUARY 1955 TO SAME AS MODEL 2 BUT WITH HAMMOND PERCUSSION FEATURE FINISH WALNUT CHERRY MANUALS SWELL AND GREAT 61 PLAYING KEYS EACH PEDAL KEYBOARD 25 NOTE RADIATING DETACHABLE TOMAL 9 PRESET KEYS AND 2 SETS 9 ADJUSTABLE HAR CONTROLSs MONIC DKAWBARS TOR EACH MANUAL 2 ADJUST ABLE DRAWBARS 16 AMD FOR PEDALS EXPRESSION ONE EXPRESSION PEDAL CONTROLLING SWELL GREAT AND PEDALS AC INPUT APPROXIMATELY 30 TO 50 WATTS PLUS WATTAGE KE QUIRED BY TONE CABINETS WEIGHT AS ILLUSTRATED 425 185 MODEL IN PRODUGTION JANUARY 1938 TO DECEMBER 1938 THIS INSTRUMENT IS TONALLY AND ELECTRICALLY SIM TO THE MODEL BC CONSOLE DESCRIBED ON TEE PRECEDING PAGES IN ADDITION TO MORMAL PLAYINC IT COULD ALSO BE PLAYED WITR ROLLS SIMILAR TO A PLAYER PIANO FLOOR DIMENSIONS ARE ALSO SIMILAR TO THE BC WITH SOMEWHAT HIGHER BACK SECTION TO ACCOMODATE PNEUMATIC ACTION CHURCH MODELS C CV C 2 C 3 D AND DV MODEL IN PRODUCTION SEPTEMBER 1939 TO JUNE 1942 SAME AS MODEL AB BUT WITH DIFFERENT STYLE WOODWORK ONE TONE GENERATOR ONE ADIUST ABLE TREMULANT AFFECTING BOTH MANUALS AND PEDALS EQUALLY CABINET WITH PEDAL KEYBOARD AND
75. and then remove the rack by pulling outward b Remove the two oval head bolis from the ends of the stop base Pull out drawbars to position 8 d Til the upper manual as far back as the top of the console will allow and then wedge or block it in this position e Complete the replacement of the playing key on the lower manual by following the same procedure given above for upper manual keys 5 76 PEDAL SWITCH ASSEMBLY 5 77 Replacement of pedal switch assembly will be accomplished as follows a Remove the pedal clavier by lifting it up in front and then pulling straight back See figures 1 3 and 3 1 Be careful to prevent damage to the de licately constructed pusher levers switch pushers at the end of each pedal b Unsolder the pedal cable wires from ter minals on the generator Disconnect the brown and black leads from the filter located on the rear surface of the up per manual assembly d Disconnect the orange red and yellow pedal signal leads from the resistor strip on the surface of the upper manual assembly e Use small wooden blocks to raise and sup port the entire console a few inches off the floor to provide the necessary clearance for the re moval of the pedal switch assembly f Loosen and remove the screws which hold the wiring tube through which the pedal wiring 5 11 cable passes to the tone generator to the con sole shelf the 3 oval head and hexagonal head s
76. and ts recognized as an echo When music played a large room however the sound echoes and re echoea repeatedly until absorbed by the surroundings The Hammond reverberation control is an electro mechanical device which introduces multiple echoes by meana of reflections within a network of springs and thereby provides adequate reverberation in locations where the natural reverberation 18 not sufficient OPERATION OF FLUID TYPE The fluid type reverberation unit see figure 1 about 4 x 5 in crosa sectien and about 4 feet high is counected to reverberation preamplifier built into the power amplifier In some models of tone cabinets the reverberation preamphfier 1 a separate unit connected to the power amplifier by cables The entire equip ment 14 attached to the organ tone cabinet Reverberation is applied to the organ music after it leaves the console Part of the console signal goes directly to the power amplifier and part goes into the reverberation channel after suitable amplification The electrical eignal fsd into the reverberation unit converted into mechanical energy by a moving coil driver omit similar to dynamic apeaker without a cone The mechanical waves are transmitted through coi springs which have the property of conducting sound vibrations much more slowly then the speed of eound waves in air in this way a spring of convenient length can introduce a delay equivalent to that obta
77. capacitors for frequencies 49 to 54 inclusive are 0 255 mf and the capacitors for frequencies 55 to 91 in clusive are 0 105 mf Both capacitors and re actors are used with frequencies numbered 49 to 91 inclusive On frequencies 44 to 48 inclu sive the capacitors are omitted bnt the reactors used have a greater number of turns Below frequency 44 neither capacitors nor reactors are used length of resistance wire shunts each gen erator output This resistance wire is wound on the appropriate magnet coil 5 11 The tone generator filters are mounted on top of the generator at an angle to minimize re action between them Wires connect the filters to the coil assemblies and to the terminal strip on the generator Ninety six terminals are pro vided on this strip 3 terminals are grounded to the generator frame and serve to ground the manuals and pedals and 91 terminals carry the various frequencies 5 12 The start motor is a shaded pole induc tion motor The synchronous run motor used on 60 cycles has a 2 pole field and 6 pole armature and a synchronous speed of 1 200 rpm revolutions per minute For 50 cycles a 4 pole armature is used which has a speed of 1 500 rpm When the organ is placed into oper ation the start switch is first operated to apply power to the start motor The rotor of the start motor slides endwise and engages a pinion on its shaft which a gear on the generator drive shaft See figure 5 3 When th
78. control Will be found under the cap marked Hi IMP INPUT Selective vibrato consoles have the tone contro located midway on the preamplifier chassis A microphone or phonograph pickup may be used with the organ if special circumstances make it desirable On type coneoles the input terminal marked on the preamplifier goes through a screen by pass condenser to the sereen of the input tube This terminal is normally grounded and the input device should have an impedance of 500 ohms or less in order not to reduce the volume of ihe organ A signal level of a volt or more is required to drive this point and therefore it is suggested thal the microphone or phonograph be connected through suiisble preamplifier having an output impedance of about 200 ohms vibrato consoles the input terminal located under the cap marked Hi IMP INPUT on the preamplifier goes to the grid of oce input tube This circuli has an input of 1 megohm impedance and requiree an input signal of about 60 millivolis maximum Most preamplifiers used on seiective vibrato type consoles are equipped with Standard pbonograph input jack The input impsdance is approximately 1 megohm and the circuit requires maximum inpui signal of about 1 2 volt The push pull signal line from the preamplifier output transformer to the tone cabinets has total impedance of approximately 200 ohme ie connected direcily to the grids of t
79. coupled to their respective assemblies by a pair of coil springs There are 12 sizes of bakelite gears corresponding to the 12 sizes of driving gears Thus 4 of the tone wheel assemblies each witb 2 tone wheels run at each of 12 speeds Each tone wheel 13 a steel disc about 2 inches in diameter accurately machined with a definite number of high and low pointe on its edge See Figure 3 Each high pont a tone wheel 18 called a tooth The number of teeth on each of these tone or phonic wheels in conjunction with the speed at which the tone wheel 15 revolving determines the fre quency of the tone generated Each driving gear with its twa bakelite gears and four tone wheels runs separate compartment magnetically shielded from the rest by steel plates which divide the generator into a series of bins All four tone wheels in any one compartment run at the same speed The individual tone wheel shafts are mounted hearings made of a special porous bronze and each of these bearings 1s connected to the oiling system by a cotton thread from the trough Thus oil from the trough 1s carried by capillary action to all bearings penetrating them and lubricating the actual bearing surface The drive shaft and both motors are lubricated in a similar manner s very important to use the recommended grade of oil regularly as itis essential to the proper operation of the organ that the generator he well lubricated If oil of varying
80. design 2 The pedal keyboard 1 concave with 32 pedal keys 3 The pedal solo unit is added 10 provide deep and rich pedal tones desired by the concert organist The Model RT 2 console includes the above features and also has the selective vibrato system as used in Model 2 The Model RT 3 Coneole is similar to Model RT 2 with the addition of the percussion feature The Model D 100 Console is similar to Model RT 3 with the addition of built in power empli fier and speakers PEOAL SOLO UNIT The pedal solo unit incorporated in these consoles provides a series of bright pedal solo tones tn addition to the usual pedal accompaniment tones available on other models The pedal solo tones generated by a vacuum tube oscillator circuit are controlled by a volume control knob and eight tilting stop tablets of which one turns all the pedal solo tones on or off and the others provide various pitch and tone colors The pedal solo unit is independent of the electromagnetic tone wheel generator and can be turned off without affecting the remainder of the organ Only one pedal solo note will play time if two pedals are depressed at a time only the higher one plays but this does not affect the foundation or eccompamment tone controlled by the two pedal drawbars It is possible therefore for the left fool to play bass accompaniment note set up on the pedal drawbars while at the same time the right foot plays peda sol
81. grades is used it s likely that the generator may be sluggish in starting and in time the threads may gum up and prevent the proper flow of oil The two spring couplings on the motor shaft the flexible couplings between sections of the drive shaft and the tone wheel spring couplings all contribute to absorbing variations in motor speed The synchronous motor does not deliver absolutely stsady power but rather operates wlth a series of pulsations one with each half cycle If the tone wheels were rigidly coupled to the motor this slight irregularity would carry extra frequencies into each tone wheel In addition hunting s suppressed by the resilient couplings and inertia members of the synchronous motor proper 2 9 2 10 Associated with each tone wheel 18 a magnetized rod about 1 4 of an inch an diameter and 4 inches in length with a coil of wire wound near one end See Figure 3 The tip of the magnet at the coil end 18 ground to a sharp edge and mounted near the edge of the tone wheel Each time a tooth passes this rod t causes a change the magnetic field which induces a small voltage in the coal the frequency bexng determined by the number of teeth and the wheel speed Small coils are used on the higher frequency magnets and larger coils on the lower frequencies It 1s found that large pole pieces are needed on the low frequency magnets to give good frequency output but is necessary to use smaller ones on the
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83. high frequencies to prevent excessive iron losses Some of the coils have copper rings mounted on them for the purpose of reducing harmonics As these are used only on fairly low frequency coils the eddy current loss in such a ring 1s small for the fundamental frequency of that coil but high for its harmonice This has the effect of reducing the relative intensities of any harmonics which may be produced by ir regularities in the tone wheels The wheels are cut so to give as nearly sine wave as possible but the generated voltage seldom reaches that ideal condition since even change the air gap will change the wave form The tip of each magnet as well aa the edge of each tone wheel 1s coated with lacquer to prevent corrosion for should oxidation set in the change in tooth shape would introduce irregular frequencies Locations of the various magnet and coil assemblies are shown in Figure 4 They are identified by their frequency numbers and the broken line between any two numbers indicates that these two frequencies are supplied by one tone wheel assembly Each magnet 18 set at the factory wath the set screw partially loosened while observing an output meter Experience has shown that the magnets seldom need adjustment and that setting them without proper equipment involves danger of damaging both magnet and wheel Therefore t 18 not recommended that the service man attempt the adjustment As a means of eliminating an
84. is located on the lower shelf of the console It receives the signal from the preamplifier and furnishes power to drive the 2 12 speakers and 2 8 speakers REVERBERATION SYSTEM To the left of the amplifier are the reverberation amplifier and reverberation unit A portion of the output signal of the power amplifier passes through the reverber ation unit to the reverberation amplifier and this drives a third 12 speaker housed within the console The degree of reverberation heard can be regulated by rotating the knob marked Reverberation Control shown in Figure 5 To the left of the pedal solo generator is the Hammond Reverberation unit Sig nals from the preamplifier are applied to the treble with reverberation channel of the power amplifier and are heard from the 8 speaker located to the right of the player In operation an electrical signal from the reverberation drive channel is ap plied to the driver unit in the reverberation device which then converts the electrical signal into mechanical energy This energy is transmitted throngh springs to a pickup unit where a part of it is converted back to electrical energy The remaini g portion is reflected back to the driver and again back to the pickup at a time interval determined by the spring lengths This trans action continues until the signal energy is reduced to one millionth of its ori ginal value The transfer time from driver to pickup and the reflections within the system
85. is used as a fulcrum the entire assembly being mounted perpendicular to ihe preset keys A spring and bumper hold ihe cradle at 600 angle toward the front of the console Once a key has been depressed the soft spring remains under ihe tube s backed by the short stiff spring to give it sufficient tension to hold the key down When the next preset key is depressed the cradie forced down and out ward permitting the previously actuated key to come up but agam locking the one last depressed If two preset keys are depressed at once both will lock down The cancel key with its long stiff spring 15 then used and forces the cradle down causing preset keys depressed to return to their normal position As there is no lock ing spring on ihe cancel key it will immediately return to its normal position PRESET CRADLE RETURN SPRING instruments had springs of various types to perform the functioo of returning the cradle assembly to its rest position and replacement when necessary became rather involved more durable spring has been devised and is used on the later instruments It can also be used for servicing the earlier coosoles Replacement is made as follows If it is delermined that a new return spring necessary on either manual the left hand end block of the manual needing ihe replacement should be removed The upper or lower manual assembly have to be raised to gain access to
86. laminated bakelite atrip so as to alternately make and break 6 contacts in order Five resistors are connected to these contacts ranging in value from 15 000 to 450 000 ohms together with a lengtb of copper wire of very little resistance At one extreme position of the eccentric all contacts are broken and the circuit is open At the other extreme all contacts are closed and there ia practically no resistance 10 the circuit The tremnlant control a 130 000 ohm variable resistor mounted on the manual chassis assembly is 1n parallel with the tremulant switch When this control turned to a position of no resistance the tremulant awitch 16 shorted out Conversely when the control ia turned to its maximum resistance the movement of the eccentric varies tbe resiatance of the circuit periodically from 0 to 130 000 ohms This parallel circuit is in with the signal from the cooaole ahead of the pre amplifier Tbere fore the aignal ia varied during eacb revolntion of the eccentric by an amount depending upon tbe adjnatment of the tremolant control Tbe tremulant aystem 1s not used in console models having vibrato Model E The tremulant aystem for Model E organ ia the same that on other modela except that two switches used Each swiich is mounted on one of the two aynchronous motors that pert of the main geoerator and chorua generator respectively and each ia connected to one manual The switch moun
87. leads from the mixing transformers where they connect to the preset panels d Unsolder green and yellow shielded wires at mixing transformers e Remove the two wood screws which secure the mixing transformer assembly to the chassis block f Secure the replacement mixing transformer assembly in place by reversing the procedures given above 5 73 PLAYING KEY 5 74 Replacemeut of playing key on upper mauual will be accomplished as follows a Remove the four screws from the left and right hand side panels of music rack Tilt the bottom of the rack by lifting the side panels and then remove the rack by pulling outward b Remove the 2 wood screws and the 2 oval head bolts from the ends of the drawbar base Lift and block up the entire drawbar base d To remove a black key loosen its key mouuting screw unhook key from screw and lift out key e To remove a white key loosen its key mounting screw and those of adjacent black keys Unhook these keys from screws push them back and lift out white key f Insert a replacement key and install by reversing the directions given above for removal g Adjust the tension of the replacement playing key by comparison with the adjoining key 5 75 Replacement of playing key on lower manual will be accomplished as follows a Remove the four screws from the left and right hand side panels of the music rack Tilt the bottom of the rack by lifting the side panels
88. negative pulses fo actuate symmetrical feed back tripping comprising two triodes Either one but only of these two triodes can be coaducting at a time for by drawing plate current it holds the other a cut off condition Suppose for example that the first triode conduct ng and the second ia cut off Now negative input pulse impressed on the grids of both triodes will not affect the second one which s already cut off buf will cut off the first This produces positive pulse at the plate of the first triode which is spplled to the grid of the second triode through its feedback connection The second triode thea suddenly conducts eurreut producing a negative pulse at its plate This negative pulse applied to the first triode grid through its feed back connection msures that the first triode remains cut off The situation 15 now exactly revsrsed with the first triode cut off and the second conducting The next input pulse will act on the second triode cutting it off again and making the first conductive and thus two input cycles are required to produce one cycle Each frequency divider circult therefore divides its input frequency in half produc ing an oufput signal one octave lower than fhe preceding divider One triode plate of each divider stage furmshes signal of rectangular wave shape to the following driver tube aod output signals are taken from the driver and dividar plates as in
89. organ combinations The chorus control should not be confused with the vibrato chorus effect described under vibrato The two effects are similar musically but are produced by completely different means EXPRESSION SWELL PEDAL The swell pedal located in the customary position 18 operated by the right foot and with it the volume of the organ may be controlled over wide range 1t operates on the two manuals and pedals equally that 18 to say once the manuals and pedals are balanced they retain their relative balance over the entire swell pedal range Two expression pedals are provided for the Model E Console Both are equipped with adjustable clamps to regulate the tension and the distance through which they move Adjustable pedal indicators operated by wires from the rheostat box are located at the extreme right side of the console above the Swell manual ECHO SWITCH Located above the starting and running switches on some consoles 1s the echo switch Fig 6 Wath ths switch it 18 possible to use two tone cabi nets and have either cabinet or both speak de pending on the position of the switch Generally one tone cabinet 15 placed rather distant from the console and is called the echo organ This feature can be added to a Hammond Organ by installation of an Echo switch kat FIGURE 6 TREMULANT The tremulant or tremolo 1s a periodic variation in intensity of all tones without change in pitch is
90. pole input plug in each additional cabinet is used for power input only and the signal 13 fed into the 5 pole coupling receptacle switch may be connected 1n place of the relay contacts to convert this circuit to the arrangement of figure 3 ECHO ORGAN WIRING Some desirable musical effecte may be secured by an echo tone cabinet in stalled at a location aome distance from the main cabinet or cabinets As indicated in the block diagram figure 8 an ecbo switcb on the console controls only the tone cabinet signal circuits and all cabinets remain energized so that they will sound instantly when desired Figure 9 shows the cable connections required REVERBERATION EQUIPMENT Some types of tone cabinets have reverberation units and reverberation preamplifiers built into them In this case sec the instruction card attached to the cabinet for correct cable connections While there are several different styles of wiring it will be found that every cabinet has 6 pole input plug and 5 pole output receptacle for connecting additional amplifiers Some reverberation preamplifiers employ a special detachable coupling cable wired as shown at the bottom of figure 10 reverberation equipped tone cabinets type GR 20 DR 20 ER 20 FR 40 and G 40 reverberation 15 applied to all organ frequencies In this case only one reverberation unit 13 required for any installation no matter how many tone cabinets are used The reverberation unit
91. preset or adjust key is pressed The Volume in soft position shunts resistor R46 across the percussion output transformer reducing percussion signal and also shorts out upper manual matching transformer compensating resistor Ri thus restoring upper manual sig nal strength to provide proper balance between the manuais The Decay in last position shunts resistor R57 across the slow decay resistor R58 reducing time for decay capacitor C31 to discharge and for V7 control grids to reach cut off Also to preserve the same effective loudness fast decay position as slow decay the control tube bias is reduced by dis Connecting R59 and allowing control tube grids to become more positive which increases output signal about 50 The Harmonic Selector Tablet does three things to the signals of the upper man ual B adjust key drawbar group In Second Position connects the 2nd harmonic signal wire to percussion amplifier b It connects the 3rd harmonic signal wire to the 3rd harmonic drawbar c It connects the signal Irom terminal J to 2nd harmonic drawbar In Third Position It connects the 3rd harmonic signal wire to the percussion amplifier tnput b It connects the 2nd harmonic signal to the 2nd harmonic drawbar It connects the signal from terminal J to 3rd harmonic drawbar The Percussion Cut off Contro which is located on the amplifier should be re adjuste
92. should be the cabinet which is con nected directly to the console in order that reverberated signal may be supphed by it to all other cabinets In Multi channel tone cabinets type JR 20 HR 40 KR 40 PR 20 PR 40 and QR 40 a reverberated signal is not available to drive succeeding cabinets For this reason an installation using several such cabinets must have a reverher ation unit each cabinet zf it 18 desired that reverberation be present n all cabinets It 1s not recommended that Multi channel cabinets be driven reverber ated signal from a preceding cabinet because irregularities n the bass response of the reverberation system may be emphasized by the bass amphher channel In case one of these cabinets 18 to be used with one or more reverberation cabinets of other types tt should be connected directly to the console with the other cabinets following it in the usual way Further information on types of reverberation equipment will be found in the section dealing with this item AC LINE son MORE 5 CABINETS TOTALING gt NOT OVER 620 wat TS INPUT FIGURE BLOCK DIAGRAM OF BASIC OF INSTALLATION FOR DETALED CONNECTIONS SEE FIGURES 4 5 AND 338 SNOMIINNOD AV 1381 ONISN LON NOLLY TIVISN GOHLSW 31VNHSI V 131100 20 WwuSvid
93. time a pedal 15 played Hum An excessive 120 cycle hum in the output will result from failure of one of the filter capacitors C75 C76 C77 and C78 Tuning of individual notes The individual note tuning system consists of 32 small inductance coils each of which 15 adjustable by moving the on ifs iron core This tuning system very stable because it has practically no aging effect and is insensitive to ordinary humidity and temperature changes However after long use under adverse climatic conditions it 1s possible that some pedal solo notes may not be exactly in tune with each other Always tune first with the tuning knobs as indicated above Keep in mind the fact that it 1s generally desirable to have the pedal solo umf slightly out of tune with the organ you are sure some notes actually require tuning proceed as follows a Oisconnect the two cable leads fram the G G terminals on the preamplifier and ground the two wires Connect one set of oscilloscope plates either horizontal or vertical to one terminai and ground b Connect the other set of oscilloscope plates to ground and ta pin 3 of V6 through a blocking condenser Remove the cover of the tuning coil box at the rear of the console exposing the numbered tuning colls The wiring diagram shows the location of these coils Set the fine and rough tuning knobs to their center positions d Push in the pedal drawbars turn the vibrato off and tu
94. to its grid circuit When any pedai 15 pressed its control contact grounde this bias circuit the PEDAL SOLO ON tablet is thereby removing the bias and causing the note to sound A condenser and resistor C81 and R112 make the tonal attack smooth The contro tube is connected to an output transformer whose second ary feeds the pedal solo signal through the volume control to the organ preeet panel Where it 5 combined with the other tonee of the organ Tuning notes of the eolo onit are simultaneously tuned by edjustiog two tuning knobs located on the pedal solo generator These change the frequency of the master oscilia tor by shunting small additional capacitors across the main tuning condenser To tune the pedal solo unit to the organ proceed as follows Press only the 4 and PEDAL SOLD tablets and hold down the middie D pedal The pedaldrawbars must be pushed and the vibrato should be off Pull out only the first white drawbar for either manual and prese the correspond ing preset key Hold down the D key above the middie C with the drawbar and the volume contro knob set to give approximately equal volume c Set the fine tuning knob the pedal solo generator to its center position and edjust the rough tumng knob to the point which brings the two notes most neer ly in tune elowest beat between them Then adjust the fine tuning knob to ma
95. 0 Models B 2 0 2 2 Figure 204 POWER AMPLIFIERS SCHEMATICS USED IN TONE CABINETS Modat 28 20 Figure 22 Modal 18 20 Figure 224 Model JR 20 Figure 228 PRE AMPLIFIERS RCHEMATICS Models 8 3 0 3 RT 3 Figum 24 3 50 POWER AMPLIFIERS SCHEMATIES USED TONE CABINETS Models PR 40 40 Figure 26 Models 20 Figure 28 TOME CABINETS Models PR 40 3 52 Models PR 40 08 40 Figure 204 Schematic Models PR 40 08 40 Figure 274 Schematic later units Models 40 0 40 Models 40 0 40 Figure Schematic 356 20 3 57 Model PR 20 Schematic 3 58 POWER AMPLIFIERS USED IN CONSOLES MOOEL 4 100 Schamatic Winng Diagram Figure 33 Model D 100 Figure 36 REVERBERATIDR AMPLIFIERS USED IN CONSOLES Modal 4 100 Figure 34 Figure 35 Figure 354 TROUSLE LOCATION Trouble Shooting Sactionalizing Trouble Troubls Shooting Chart RES Repair Disassembly of Vibrato Scanner 8 82 3 41 342 3 42 343 3 47 3 47 347 3 55 36 3 61 3 1 O Q228 8 v 51 913 788 me BE TOT RIS TORT 3 1 i T W m Tewa Eu via
96. 0 OHMS WIRING OF PEDAL CIRCUITS 2 22 MODEL CONSOLE Figure 12 SIGNAL BUSBAR 2 PICKUPS PEDAL SHIFTER FOR PEDAL SOLO SWITCH ON REAR ACTUATOR lt PINS i pe 4 9953 8313333 ANANG 42 DOWN STOP FELT FIGURE 21 MODEL RT RT 2 RT 3 and D 100 Pedal Switch Assembly The pedal switch shown in Figure 21 is similar in internal construction to the manuals Figure 22 Each of the 32 pedals actuates a set of contact springs making nine contacts available for each note Each note consists of a funda mental and a number of harmonics no sub harmonics being used The pedal contact springs are connected to terminals by resistance wires similar to those used the manual assembly and cable connecte these terminals to the pro per terminals on the generator terminal strip Only seven contacts are used for the mechanical generator notes the other two contacts are used by the ped al solo unit as explained later in this book Four colored wires carry the pedal tones from the busbars to the pedal draw bars The wires are connected first to a resistor panel on the back of the manual assembly small choke coil and resistor mounted on the manual assembly are wired to the lower drawbar see Figure 23 and serve to filter out any higher harmonics or transients which might be present in the lower pedal frequencies Figure 24 is wiring
97. 00 5320 000 Stopped Flute 00 4432 000 Dulc ana 00 8740 000 French Horn 00 4544222 Salicional 00 5403 000 Flute 8 amp 4 00 4675 300 Oboe Horn 00 5644 320 Swell Diapason 00 6876540 Trumpet 32 7645 222 Full Swell Adjust harmonic drawbars for Ist Group Upper Manual Adjust harmonic drawbars for 2nd Group Upper Manual G G A Cancel 00 4545 440 Cello 004423220 Flute amp String 00 7373 430 Clarinet 004544220 Diapason Gamba and Flute 006644 322 Great no reeds 00 5642200 Open Diapason 00 6845 433 Full Great 008030000 Tibia Clausa 427866244 Great with 16 Adjust harmonic drawbars for Ist Group Lower Manual Adjust harmonic drawbars for 2nd Gronp Lower Manual EO 0 aoe ajosuo 5 0 PON Suum 71 amig 26 tnit ahiman OLIVA 1 LUE E ME BIO P UI Svamenwaanona taye toeroe BF Gy grine exes 38 MOIVM3N39 aN vada II RNA
98. 000 cubic feet 3 4 000 to 8 000 cubic feet 6 2 000 to 4 000 cubic feet 10 LOCATION OF TONE The back of this tone cabmet must be at least 1A inches from the wall on order to provide adequate ventilation The location of the tone cabinet in the room a of great acoustic importance Con sult 2 Hammond service man for recom mendations The cabinet must always be placed at soma distance from the console hot only acoustic reasons but also be cause the magnetic feld from the amphber produce hum n the console circus gt 940 REAR f the two ure ver close together In case of bum make ortun that no piece of clecernal ippiatus havmg strong magnetic held 1s close t the counsole lor example an lok or a fluorescent hight ou the console can some produce loud hum in the speakers Some bum the bass channel may be caused by unbalawed AVe tubes Four new tubes of same make will generally be satufacturily balanced Sometimes hum level can be seduced by terchanging tubes 23465 0 HAMMOND ORGAN COMPANY 4200 W Diversey Ave Chicage 39 SL3NISVO 3NOL OVD Ord O3SN Y3IsITdWY Or 0v 62 201 2953 0v Andino AANIH 3 09212 04 sogni sanas 204200 55 8 oa os ROZ amoa 4209 0 AS 0310N 4309 SAMOA EL
99. 0500 to 32015 A0 15 32016 amp ABOVE A0 15 CODE 75877 amp ABOVE 15 CODE ALL A0 40 ALL A0 40 FOR PARTS INFORMATION ON THE MODELS PR4O QR40 AND PR20 TONE CABINETS 6 16 OF B 3 C 3 PARTS LIST POWER AMPLIFIERS TYPE r 1 POWER TRANSFORHER 2 OUTPUT TRANSFORMER 3 FILTER CHOKE TYPE c 1 POWER TRANSFORHER 115V 60Hz 115V 50 60Hz 230V 50Hz 2 OUTPUT TRANSFORMER 3 FILTER CHOKE 11 12 40 OHM TYPE H 1 A 1 POWER TRANSFORMER 115V 60Hz 115V 50 60Hz 230V 50Hz 2 OUTPUT TRANSFORMER 3 FILTER CHOKE 11 14 40 OHM TYPE HR 1 1 POWER TRANSFORMER 115V 60Hz 115v 50 60Hz 230V 50 60Hz OUTPUT TRANSFORMER 3 FILTER CHOKES 4 REVERB TRANSFORMER TYPE JR 1 POWER TRANSFORHER 115V 60Hz 115 50 60 2 230V 50 60Hz OUTPUT TRANSFORMER 3 FILTER CHOKES REVERB TRANSFORMER TYPE K 1 POWER TRANSFORMER 115V 60Hz 115v 50 60Hz 230V 50 6 0Hz 2 OUTPUT TRANSFORMER 3 FILTER CHOKES TYPE LR 1 POWER TRANSFORMER 115V 60Hz 115V 50 60Hz 230V 50 60Hz OUTPUT TRANSFORMER TREBLE BASS 6 HENRY 18 HENRY REVERB TRANSFORMER 2 40 OHM 2 40 40 OHM 2 3 FILTER CHOKES 4 REFER TO PAGE 0 16670 1 003 016670 002 0 16681 1 003 016681 001 0 16682 1 0 16670 5 003 016670 002 0 16670 6 0 16670 7 0 16681 2 0 16682 1 0 20927 1 003 036899 0 20927 2 0 20927 3 A0 16681 4 0 16682 2 A0 20927 1 003 036899 0 20927 2 0 20927 3 0 16681 3 003 016681 003 0 16682 2
100. 0811 amp 00 030921 602 050061 800 020771 600 9030672 600 030991 429 020763 600 021334 415 010252 00 0210112 600 020651 600 020041 400 021071 600 030931 425 010532 601 070262 400 021172 41 0082533 600 021031 600 020351 600 021191 600 020951 607 080017 400 020731 800 021091 500 021151 0 021311 423 010582 625 010542 425 030522 625 010662 3 010113 400 9210 51 06 010282 406 010042 600 021231 400 0091 407 010028 413 010062 800 020791 600 030351 RESISTOR 33K TRANSISTOR ELECT CAP 1400 25 100 25 25 25 25 25 ELECT 3 3K ELECT 560 5 RESISTOR VARIABLE RESISTIR sak iw CAPACITOR FILM 10 000 of CERAMIC 10000 90 CERAMIC Pf CERAMIC CAF 2200 ef CERAMIC 150 wf CERAMIC CA 100 of AND RESISTOR ASSY AND HESISTOR PANEL ASSY RESISTOR PANEL ASSY REVERB ORIVE TRANSFORMER TREBLE OUTPUT TNANSFAAMER BASS OUTPUT TRANSFORMER T2 TREBLE OUTPUT TRANSFORMER T3 POTENT LOMETER POT CONTROL TREBLE REVERB SWITCH BASS REVERB SWITCH ROOM SIZE SWITCH TERMINAL FAMEL POST TERMINAL COVER TERMINAL PAMEL FILTER CAPACITOR TUBE TUBE SOCKET EBES TUBE TUBE SOCKET 2 TUBE TUBE SOCKET TUBE TUBE SOCKET A2AX TUBE TUBE SOCKET 600 020852 001 021070 1450 0402 600 020411 600 020431 676 000107 400 030731 413 010142 415 0183 25 1512 625 030583 425 010292
101. 12 KEM naa NIST Y NOMA GNhOWO NOS Jary CON SIDVLIOA Tw OO NOL yw SEVE 30 29719618457 IYE 96990 0000000 RINNE 4 JIWO 3134476 CU OND Mos LON 55062 E OA suyu sew 2 AINNYHI JAVE __ OL WNAS i E 25 SSO dae Shuwa q 1 EIS NO H 8 2 ue ee re a N SA E Sn 2 Yo RO ue 7 ne eus faic CEND m ETE 52 40 40 FRONT to card undermde of bench for console insiallabon and oiling tnstruc CAUTION PACKING FOR MOVING OR SHIPMENT The Reverberation Uor must be locked before moving cabinet unit otherwue delicate parts will be damaged because of bouncing of the three spnngs when hanging free lock the Reverberation Umt insert screwdriver in slot at end of lock rod A shown in Fig and turn 1 4 turn counterclockwise If cabinet has rear grille an openiog provided in grille cloth sn allow acce
102. 143234 1 A 9555 9 00055 494 ir SANL rnarno DNIAYH SS3SV33S LON ANY HIIM 50 SI WY 4 09 GIAOWTY LSNW T 19T OV isurrojeuwi 4H L OL NOD OL 5414 NSSHOS 219 0 9 OF nding 21 SYM 0 66191 Ov 8444105 11 AGATA WY SIHL JO STSGOW WSITHYS NI 55 A29 2979 NOILY TTVLSNI SYM E SAF SYF CIF SLSNISVO 3NOL 3 AOS NI 0517 QC VICO CO 4822 ON 5 02 59 WING Pue ON 02 SLENIGVD SNOL 50 Me 9152 MIA NOLLOQ NMOHS wNO iov 0n d ONY 5410 14304 ALON gt m Z ay aus 3 7 Ov 9 E A fi aes 009 82 099 001 T
103. 160 pt 500 RESISTOR 1 2K CERAMIC CAP 380 wf 5007 CERAMIC 500 CERAMIC CAP 1 5K et 500 mom in 40 450 40 400 30 350 ELECT 30 310 50 230 30714 3011 4 POWER TRANSFORME 2300 50421 POWER TRANSFOR 7 PERCUSSION QU OUTPUT TRAMEF MMER FERDUSSIUN INPUT TRAMSFONMER PERCUSSION MATCHIMG TRANSFOR CERAMIC CAP 24 pt 500V SWELL CAPACTTOR ASSY COVER SHORT COVER LOMG AC TERMIMAL FAMEL TERMINAL PANEL 1 LONG RAINAL pai FIGURE 9 PRESET PANEL ASSEMBLY 122 000001 HARKER PLATE e 034 036050 MARKER PLATE 034 025050 LOCHW TRE 013 021376 SCREW 4 USED 414 070814 847 000001 BUSBARS E 029 03605 BUSBAR 029 03605 7 4 SCREW 189 USESI INSULATAR ROD ASSEMBLY 062 021 36 LOCKMIRE 0132021243 VIBRATO LINE ASSEMBLY 121 000083 CAPACITOR 0 0056 1007 408 010252 CAPACITOR 0 010 100V 406 010072 4 RESISTOR 00 20791 CAPACITOR 0027 100 406 010222 1936 EARLY MODELS 18 USED 003 016924 001 RESISTOR 22K 600 020811 COIL LATER MODELS 18 USED 003 033303 10 START TOGGLE SWITCH TOGGLE SWITCH SWITCH PLATE LAMPHDIDER amp SSEMELY HAMDLE FOR START amp SWITCH LENS CIMDICATOR LIGHT SCREWS Ie NM moon n 12 7 4 12 9 12 10 12 14 1242 12 13 i
104. 244 12 15 02 16 12 17 EXPRESSION PEDAL ASSEMBLY RUNDER MAT BROWN BLACK PEDAL 3 BEARING BRACKET WASHER LOCHMASHER QLD STYLE LOCKWASHER SCREW PEDAL SEARING SLOTTED BEARING BRACKET SCREW SCREW WASHER WASHER SCREW SAVARE NUT LOCKWASHER SCREW SCREW FIGURE 12 123 000010 043 031436 043031437 920 021725 035 031429 993 000025 999 000733 99 031251 646 100512 017 031431 035 031420 635 050211 216 030611 999 000725 999 001121 850 080512 999 001343 999 000729 843 081113 635 050211 Pc A PEDAL ARM HARDWARE ASSY FOR CONNECTING ROD CONNECTING 500 EXTENSION SPRING BRACKET SCREW LOC WASHER WASHER SPACER HARDWARE FOR LOWER MOUNTING OF CONNECTING ROL SCREW LOCRWASHER THRUSTWASHER SPR INEWASHER 060 021732 012 021845 035 021399 850 110916 18 080914 999 001171 929 000725 993 000071 017 021427 616 090411 999 000728 389 000149 598 0001 PR 40 TONE CABINET SPEAKER 16 SPEAKER ems 12 TRANSFORME FIGURE 13 ELECT CAPACITAR t40 450 40 450 30 350 TUSE POWER SUPPLY ASSY 115V 8OHZ POWER SUPPLY ASSY 230W 30HZ RECEPTACLE CONNECTOR CONSOLE TONE CABINET CABLE COMPLETE CABLE ONLY SPECIFY LENGTHS CONNECTOR ONLY CONSOLE END CONNECTOR ONEY TONE CABINET END CONNECTOR CAPS 4 REGUI
105. 3 PRE AMPLIFIER FIGURE 3 3 36 ms CONTROL e 40 USED IN CONSOLES MODEL A SERIAL 2560 TO 2646 INCL MODEL SERIAL 5940 TO 10032 INCL MODEL SERIAL 1203 TO 1212 INCL MODEL D SERIAL NO TO 1208 INCL PLAYER SERIAL NO 9000 TO 9123 INCL PRE AMPLIFIER FIGURE 4 mr TONE CONTROL HEATERS 4 400 4 400 USED IN CONSOLES MODEL A SERIAL NO 2647 TO 2711 INCL MODEL B SERIAL NO 10033 TO 11205 INCL MODEL SERIAL 1213 TO 1298 INCL MODEL D SERIAL NO 1809 TO 9268 INCL PLAYER SERIAL NO 9124 amp 9210 MODEL G ALL PRE AMPLIFIER Filament transformer 115 v 40 cy AO 17830 1 T4 Output tranaformer Primary 1300 ahma Secondary 15 DC Resistance AO 17826 1 CONTROL 4 AO 20293 23 R il CONTROL IMEG 20293 23 13 Filament transformer 5 66 17830 1 Outpat transformer AQ 17120 1 3737 VIBRATO SWITCH ANO SCANNER TERMINAL Locate ECR FI esv an HEATERS S ENEMMPLITERS WITH FOLLOWING CODE MARKS DEFER FOLLOWS A CODE b ANO BELOW RESISTORS RW AND RII ANE S COPE 6 INCLUDES 2 ONLY CA OMITTED SCREENS OF VI ANG V TIED TOGETHER RU It 13 MES AND R75 2700 A AND Re ARE LS MEG ANE RT V 3308 X cost R BALY 25V TRANSFORMERS
106. 4 shows one of harmonic drawbars by which the organist s enabled BTH HARMONIC 6TH HARMONIC JIRU HARMONIC FIGURE 4 ONE HARMONIC DRAWBAR GROUP to mix the fundamental and any or all of eight different harmonics various proportions The third bar from the left controls the fundamental and cach of the other bars is associated with a separate harmomc If drawbar is set all the way in the harmonic it represents 18 not present in the mixture Each drawbar may be set in eight different positions by the organist in addition to the silent position Each position as marked on the drawbars represents a different degree of intensity of the harmonic 16 controls When drawn out to position the harmonic t represents will be present with minimum intensity when drawn out to position 2 with greater intensity and on up to position 8 tone color 16 logged by noting the numerical position of the various drawbars For instance the tone set up on Figure 4 is known as tone 34 630 5210 After a tone 15 logged it may be made available again by setting the harmonic drawbars to that number The drawbars in earlier consoles have distinct intensity positions with silent spots between them Later consoles are equipped with continuous contact drawbars which move smoothly with no interruption in tone HARMONIC DRAWBARS FOR THE PEDALS in the pedals the harmonic resources have been combined into two drawbars which ma
107. 40 TONE CABINET MODEL 2 40 IN PRODUCTION NOVEMBER 1936 TO DECEMBER 1947 CABINET SIZE 36 WIDE 36 HIGH 28 1 2 DEEP FINISH WEIGHT OUTPUT AC INPUT MODEL C 20 CX 20 AND CXR 20 TONE CABINET 1 6 WALNUT STAIN 225 POUNDS 40 WATTS 2 AMPLIFIERS 4 12 SPEAKERS APPROXIMATELY 360 WATTS SEMI DECORATIVE DOUBLE STRENGTH CABINET DE SIGNED FOR USE INDIVIDUALLY OR CROUPS 2 40 18 FOUND DESIRABLE FOR MANY CHURCHES AND FOR LARGE INSTALLATIONS FOR IT MAY BE ISED APPHOPRIATELY IN ALMOST ANY SETTING MODEL CR 20 MODEL CX 20 MODEL CXR 20 MODEL B 40 TONE CABINET IN PRODUCTION 1937 TO MARCH 1942 IN PRODUCTION 1939 1942 EQUIPPED WITH REVERBERATION UNIT IN PRODUCTION JANUARY 1939 TO MARCH 1942 EQUIPPED WITH ROTOR TREMULANT SEE MODEL CXR 20 FOR PICTURE OF THIS FEATURE IN PRODUCTION NOVEMBER 1939 TO MARCH 1942 EQUIPPED WITH ROTOR TREMULANT AND REVERSER ATION UNIT 29 WIDE 53 HIGH 18 1 4 DEEP MATCHED AMERICAN HUTT WALNUT AND ANTIQUE BRASS HARDWARE 153 POUNDS 20 WATTS 1 AMPLIFIER 2 12 SPEAKERS APPROXIMATELY 200 WAT MODEL 401 CABINET SIZE FINISH WEIGHT OUTPUT INPUT OF THESE MODEL C 40 TONE CABINET MODEL 0 20 MODEL 0 20 MODEL DR 20 IN PRODUCTION JUNE 1936 TO DECEMBER 1937 38 WIDE 71 27 1 2 DEEP WALNUT STAIN 313 POUNDS 40 WATTS 2 AMPLIFIERS AND 4 12 SPEAKERS APERO
108. 450 135 U S GOVERNMENT PURCHASED EQUIPMENT The Model consoles and tone cabinets were built for the Government and now will be found in uee throughout the United States and foreign countries in chapels af all ser vices Officers Clubs or recreation service buildings The console is identical to the Model D except for the decorative woadwork and provision for detachable handles The tone cabinet Model G 40 contains two emplifiers and four speskers mounted in z horizontal row and is electri cally similar tc Model 8 40 tone cabinets but has a re verberation control unit Produced from June 1941 to NOVEMBER 1944 MODEL G CONSOLE AND TONE CABINET MODEL C 26 3 CONSOLES AND 406 These consoles are identical in appearance to the 2 except that s monitor speaker 18 located on the lower left hand side The preesplifier in the C 2C is designed to operate the monitor apeaker In the 36 the preamplifier is the same in the C 3 A small suciliery amplifier drives the monitor speaker In both Models B voltage from the tone cabinet required to make the monitor spesker operative The HR 40G is identical ta the HR 40 except that it is equipped witb standard 6 conductor cable which must be used in conjunction with the 26 1 2G in production June 1952 to March 1953 C 36 in production January 1955 to CONCERT MODEL E MODEL Et IN FRODUCTION JULY 1937 TO JULY 1942
109. 5 65 Remove the four screws from the left and right hand side pauels of the music rack Tilt the bottom of the music rack by lifting the side panels and remove the rack by pulling outward 5 66 Remove the 4 chassis bolts underneath the console and the 2 machine screws under the front lower manual rail that hold the entire manual chassis in place 5 67 Discounect the 79 manual leads 68 pedal leads 4 ground wires and the pedal filter leads The pedal filter is located on the rear surface of the upper manual assembly 5 68 Pull out all drawbars to position 8 and then tilt the manual chassis from the front as far as the top of the console will permit Place suitable wedges or blocks on both sides of the manual chassis to hold it in this position The manual chassis must be tilted to provide ade quate clearance for the bolts in the corners of the main generator assembly 5 69 Unhook the four suspension springs on which the generator assembly rides 5 70 Lift up the generator assembly and move it at the rear of the console 5 71 Install a replacement generator assembly by reversing the procedure given above for re moving it 5 72 MIXING TRANSFORMER ASSEMBLY The Assembly of two mixing transformers is provided complete with all leads to the preset panels and can be removed as follows a Remove the rear panel b Remove the two screws which secure the transformer cover in place c Label and disconnect all
110. 625 010253 063 038402 063 023504 053 023911 003 025327 003 022349 003 025344 003 02549 674 000107 025 022607 008 036398 008 023470 004 023472 1008 02275 044 031434 041 038569 006 022725 450 040401 002 012302 004 021609 002 006700 004 021506 002 012300 006 021609 002 006300 004 021013 002 012301 004 021609 LEVELING TABS DRIVER 3 LOCKING CAM LIME T CHANNEL TWISTED PAIR SHIELDED LEAD ORIVER INPUT PICK UP OUTPUT SPRING LIMIT CHANNEL CLIP FIGURE 16 REVERRERATEDN UNIT ASSENBLY RING ASSEMBLY SPRING LONG SPRING 2 IMED 3 CASE ASSEMBLY STATIONARY MOVEABLE ASSEMELY FALLBOAD ASSEMBLY HINGES 1 USED HINGES 4 USED MUSIC PANEL MUSIC PANEL MSE BUMPER MUSIC PANEL HINGER MUSIC PANEL HINGE SCREWS FIGURE 17 ATA PLATE 032 01577 PAM 050 000930 BENCH Lock KEY OLD LOCK KEY LATE LOCK KEY MBST RECENT ASSENWLY tFLUSH ML CLAVIER ASSY FOR PARTS SEE 4559 BREAKDOWN 00019 22 28 E TYPICAL 4 PLACES FIGURE 18 CONSOLE REAR VIEW C 3 FREAMPLM PREAMPLIFIER aS a SCREW YE TURE SWELL CARACTIOR NCAA FIXTURE LIE YNCHAO YNCURUNDUS OF CONTENTS HAMMOND CONSOLES MAJOR ASSEMBLY FRONT amp REAR VIEWS OF MODEL RT3 REAR VIEWS OF MODEL A100 amp D100 REAR VIEW OF MODELS WITH TREMULANT REAR VIEW OF MODELS WITH VIB
111. 7 22 23 24 9 37 FIGURE 4 MANUAL ASSEMBLY COMPLETE KEY s uas as 223 av LIE 2 a s w n ay 1 n vo O 11 mo D 2 2 s nez 1 MEET 4 RIGHT HAND ENDELECK be A P FRONT 5 TWEEN 51 Dh PRESET W FRONT STRIP FLOWER MANUAL BLACK 4 40 MANUAL HATCHING TRANSFORMER PRESET K no ngea 2 41 DRAWEAR ASSEMBLY BLACK RESET D SLIDE xv L KE u1 VIBRAT CHORUS SWITCH u HARF PR 479 4 amp PENCUS CONTRO win B MANUAL CONTROL SWITCH ASSE w T 1 amp VIBRATO SWITCH ASSEM wl IREAT STRING WITCHI wt ON OFF m E ORAWKAR BLACK 6a SWITCH TAR PERCUSSION VOLUME 249 BLANK ORANBA KNBB 085 v WITH TA ORAWDAR KNAB FIGURE 5 MANUAL ASSEMBLY BREAKDOWN CRADLE SPRING AND BRACKET ASSY KEY COMB ASSDMNLY PRESETS KEY COME ASSHELDY PRESETS WEY ASSEMBLY MANUAL KEY BRACKET AND BRACKET AND BRACKE HACKE BRAKE AND AND CHANNE AND CHANNEL DOWNSTOP FELT ASSY SHARPS ASSY HATURALS ASSY CANCEL ASSY SHARP PRESETS ASSY PRE res KEY CHANN
112. 725 Lows P1VAT 041 021793 WOOD SCREW 901 091514 PEDAL 1 060 0135353 FELT 042 001727 PEDAL 1 SIDE 043 001721 PEDAL KEY DE 19 040 035545 PEDAL DOWN STOP FELT 042 001720 PEDAL KEY 13 050 035588 BLACK PEDAL CAPS 023 001648 FIGURE 7 PEDAL SWITCH ASSEMBLY PEDAL BUSSAR SHIFTER PEDAL PUSHER PINS 25 PEDAL PUSHER FELT ENCLOSED PREAMPLIFIER ASSEMBLY CERAMIC CAP 4 7 500 RESISTOR RESISIOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR 1 100K 390K 1 2 Ww ome 100 15 270K 4 7 800 0710 600 0 RESISTOR WEREWOUND 500 10W CERAMIC 2 500 CERAMIC CAP IK sf 500 E CERAMIC 20K f 500V 415 0107 CAPACITOR 0 33 400V 40 0106 CERAMIC 0 01 500 290104 RESISTOR WIREMOUND 4 5K 10W RESISTOR WIREWOUND 7 5K CERAMIC CAP 220 500 CERAMIC 2 2K pt 500V RESISTOR 470K RESISTOR 2 2 MEG NESISTER 10 MEG 3 RESISTOR 820K CERAMIC 39 pt 500 RESISTOR 1 8 RESISTOR 4 7 MEG RESISTOR 2 16 1w RESISTE 180 OHS RESISTOR 2 7 MES RESISTOA RESISTOR 10 MEG CAPACITOR 0 047 MF 400 VARIABLE IFEREUSSIDN CUTOF 1 30K VARIABLE FET I TONE 300K CAPACITOR 1 MF 2007 ELECT 4000 35 CAPACITOR 0 33 2009 CERAMIC
113. AGNET TONE WHEEL ONE SIDE OF GROUNDED 2 12 GENERATOR Figure 3 5 z 9 9 gt FRONT VIEW OF MAIN GENERATOR GENERATOR MAGNET LOCATIONS Figure 4 Numbera sbewn are frequency numbers TRANSFORMER ANE NUMBERS N V ENS al SS 22 FREQUENCY ET gs Se Hi Mon t COVER e PA aee 3 aput Fri MUR MUMMERS ON TRANSFORMERS ARE FREGUENCY NUMBERS TRANSFORMERS Sec ines EM MOTOR ewe EEE SSSR z EEE ENEE a gt ETO ERE LETRA TERMINAL FREQUENCY NUMBERS FIGURE 95 220 ATO VER CHORUS GENERATOR Used in models BC D E and G The purpose of the chorus generator 15 to add a series of slightly sharp and shghtly flat tones to the true tones produced by the main generator The resulting electrical wave contains a complex series of undulations which enhance the pleasing effect of many tone qualities notably string and full organ combinations It should be noted that no chorus effect 1s produced on frequencies below 56 The frequencies covered by the chorus generator are numbers 56 to 91anclusive on the main generator The difference in frequency between the main generator and either flat or sharp tone 18 8 for fr
114. AL NUMBER 38726 19 46301 CONSOLES SEAWAL NUMBER 2733 quest comers CE cantaca n WERE VE NR Min all VIBRATO PHASE SHIFT LINE FIGURE 9 VIBRATO SYSTEM ack V coasts SERIAL EO AND ABOVE THE HAMMOND ORGAN WITH PERCUSSION Percussion tones are available only on the upper manual with the B adjust key depressed of all consoles with the suffix 3 in their mode designation These consoles except for the four percussion control tablets in the upper right hand Corner look and function similar to consoles with the suffix 2 in their model designation when the percussion effect 15 not in use 1 THEORY OF OPERATION The percussion tones are produced by borrowing the 2nd or 3rd harmonic signal from the corresponding drawbar of the upper manual adjust key drawbar group amplifying it returning part of it to same drawbar and conducting the balance through push pull control tubes which when keyed cause the signal ta fade away at a pre determined rate 2 GENERAL CIRCUIT OPERATION All Reference Is To Figure 24 Section 2 With percussion tablet on npper manual B adjust key and an upper manual playmg key pressed the 2nd or 3rd harmonic signal appearing on an upper manual busbar is conducted through
115. ANSFORMER FRERUENC TRANSFORMER FRERUENCY TRANSFORMER FREGUENCY TRANSFORNER FREQUENCY TRANSFORMER FREQUENC TRANSFORMER FREBUENEY TRANSFORMER FREQUENCY TRANSFORMER FRERUENCY 4 TRANSFORMER FRERUENCY TRANSFORMER FREGUCRCY TRANSFORMER FREQUENCY TRANSFORMER FREQUENCY FREQUENCY TRANSFORMER FRE TRANSFORMER FRE Bul TRANSFORMER F 35 36 57 38 39 40 4 FIGURE 2 TRANSFORMER FREGDENCY 190 FREQUENCY 79 WANSF RMER FREQUENCY 55 TRANSFORMER FWERUENCY REBUENCY FRENUENCY ERUENCY CM UP COIL FREQUENCY 5 DRAWBAR ASSEMBLY COMPLETE DRAMBAR ASSEMBLY COMPLETE UPPER STOP SWITCH CHANEL BUSBAR PANEL 22 USED MUSRARS UPPER DRAWBARS OuSBARS LEWER PEDAL BUSRARS INSULATORS 122 USED STOP PANEL REAR CENTER 11 SCREW STOP PANEL REAR t4 WASHER FIGURE 3 120 000008 041 021991 02 02032 029 043 020574 045 021890 244 040214 045 0141389 393 000725 5 001213 008 020773 16 SCREW STOP PANEL FRONT 14 STOP PANEL tFREMT CENTER 1 SLIDER WITH CONTACT SLIDER SCREW DRAWDAR KNOB DRAMDAR KNOPS SEE FIGURE 4 MANUAL ASSY Q45 021887 045 021884 060 036003 028 035601 940 030534 18 45 9 40 20 25 46 43 2 10 42 4 35 28 29 32 33 34 47 44 47 mre TNI n TY wi T 0 LIMIN 36 6 17 15 1413 1 2 3 45 67 39 38 26 2
116. C3 are included in it as well as the 3 vibrato positions V1 V2 and V3 The vibrato effect is turned ON and OFF for each manual separately by means of VIBRATO SWELL and VIBRATO GREAT tablets on the manual assembly 5 30 The preamplifier used with this circuit has two separate channels into which signals from the VIBRATO GREAT and VIBRATO SWELL tablets are fed Reference paragraph 5 37 The VIBRATO signal goes through a preliminary amplifier through the vibrato Figure 5 5 Vibrato Line Box 5 5 ROTOR CONTACT PIN ROTOR INSULATOR END BRUSH MOUNTED ON LEAF SPRING ROTOR PLATES STATIONARY PLATES SIDE BRUSH TENSION SPRING A BRUSH COVER REMOVED SHOW BRUSHES VIEW WITH SCANNER COVER REMOVED B 2 SETS OF PLATES REMOVED TO SHOW ROTOR Figure 5 6 Vibrato Scanner CABLE CHORUS CONTACT TO LINE FIXED CONTACTS CONNECT TO LINE TO SCANNER MOVING CONTACTS CONNECT TO SCANNER BOTTOM VIEW WITH COVER REMOVED Figure 5 7 Vibrato Switch contacta U VIBRATO PHASE SHIFT Li Figure 5 8 Schematic Diagram Vibrato System system and then into additional stages of amplification The NO VIBRATO signal also has a preliminary amplifier but bypasses the vibrato system and goes directly into the additional amplifier stages 5 31 MANUAL CHASSIS ASSEMBLY 5 32 The 9 contact springs on each key are connected by resistan
117. Diagram Figure 15 Schematic Figura 16 Modal A 100 Schematic Figurs 30 Winng Diagram Figure 31 Model BV CV 234 Winng Oragrem Figure 3 4 Schematic Figure 18 35 Modal 26 234 Winng Diagram 3 8 Schemabc 234 Models 62802 3 8 Winog Figure 20 38 Diagram Figure 204 3 9 Schematic Figure 21 3 10 Models 6 3 0 3 Winng Oregram Figure 23 Schematic Figure 24 Model 0 100 Schematic Figure 33 Winag Diagram Figure 35 Winng Diagram Sheet m Winng Sheet 2 Winey Diagram Figure 18 Schemabe BV amp RT Figura 18 SEE PAGE Modal RT 2 Winng Figure 22 dd Winog O egram Figure 224 3 14 Schematic 8 2 0 2 RT 2 SEE PAGE Figure 21 Model RT 3 Winog Figure 26A Schematic 8 3 C 3 amp RT 3 SEE PAGE Figure 24 PEOAL SOLO UNIT 3 21 Winng Diagrams Tuning Block Diagrams Figure 1 amp 16 3 24 Modal RT Schemetic 3 25 Model AT 2 326 Tube Voltages 3 28 Suggestions 3 28 Removing Parts 3 30 List 3 31 Diagrems Solo Generator 3 31 Figum 4 48 amp 46 3 32 AMPLIFICATION SYSTEM Pre Amplifier Schemabes Model Figure 1 335 M
118. ED WHERE APPEARANCE IS NOT A CONSIDERATION SUCH AS IN TONE AND REVERBERATION CHAMBERS THE TREBLE DIRECT SPEAKER IS NORMALLY MOUNTED IN THE IN AN UNUSUAL INSTALLATION WHERE THE CEILING IS VERY LOW OR CABINETS ARE STACKED OR RADIATION IS OTHERWISE RESTRICT ED IT 18 POSSIBLE TO MOVE THIS SPEAKER TO THE HOLE PKO VIDED IN THE FRONT THE METAL DIFFUSER IN FRONT OF THE SPEAKER MUST ALSO MOVED AND THE WOODEN COVER MUST BE ATTACHED UNDER THE TOP TO CLOSE THE HOLE 1 12 THEORY OF OPERATION The console of the Hammond Organ contains the entire tone producing mechanism which is completely electrical m operation Within it are produced all the tones and tone combinations of tbe organ The electrical waves are made audible as music by one or more tone cabinets containing suitable amplifiers and loud speakers The block diagrams Figures 13 and 14 show the chief components of the instrument Electrical impulses of various frequencies are produced within a unit known as the tone generator containing a number of phonic wheels or tone wheels driven at predetermined speeds by a motor and gear arrangement Each phonic wheel 1s similar to a gear with high and low spots or teeth on its edge As the wheel rotates these teeth pass near a permanent magnet and the resulting variations in the magnetic field induce a voltage in a coil wound on the magnet This small voltage when suitably filtered produces one note of the musi
119. EL FELT FELT MANUAL CONTACTS MANUAL ACTUATERS BUSBAR RETAINER PERCUSSIDM BRITEN UNDER PRESET MANUAL BUSBARS RECTANGULAR MANUAL BUSBARS SEUARE 141 3714 MANUAL EUSDARS SEUARE 41 11 16 1 WIRE PANEL TEENIT LUBE prim qm 21 X M WSERT A FIGURE 6 PEDAL KEYBOARD ASSEMBLY A 105 0 3 E 100 E 200 E 300 200 153 000009 SPECIAL LOCATOR NUT 999 001412 BLACK PEDAL CAP MOUNTING SCREW 422 102514 MOUNTING SCREW 814 103714 SWITCH PUSHER SPRING 012 001800 SLIDE 032 024390 SWITCH PUSHER SPRING SCREW 879 071114 PEDAL KEY Cle 01 El 61 Aly C2 STRETCHER BAR 070 000501 12 E2 F2 62 2 B2 040 035564 UPSTOP SPACER 020 001742 PEDAL KEY A92 060 035592 GUIDE BUSHING 017 030726 PEDAL KEY 64 2 060 035591 UPSTOP 070 000401 PEDAL KEY 2 2 040 035590 999 001233 PEDAL KEY 2 060 035539 399 000732 070 00031 999 000095 COVER MOUNTING SCREW E 3 082631 PEDAL FELT 15 HOLED 042 001911 COVER MOUNTING SCREW MGSHER 399 000411 PEDAL FELT 7 MOLE 042 001914 HINSE SPRING MOUNTING SCREW 265 0913 PEDAL FELT 2 HOLE 042 001914 HINGE SPRING 012 035586 PEDAL QUIDE PIN OLD STYLED 927 001703 KEYBOARD BASE 070 000250 i PEDAL GUIDE ROLL PINI 020 039810 SHORT PIVOT 041 021792 MEDIUM PIVOT 041 071791 PEDAL GUIDE BUSHING 012 034
120. EXE Miele la dst Spo 5 PES 5 0 UM muss mos eseni Hanas lg UA 3442 95201453 WITA 4283093964 645 M30 2 uw 1 ANINE aM QNO ANNO 1 w3isen 3 26 001 osre S33OSNO2 i INY amp 1300W mater nee _ Qiu 215 SISAL 0105 99034 DX ed 32 Ie ges abe eene O s nace M Sime qp HH ems 1 utn 1 320010 093 maging So JO 3 AON3 D 100271972501 3 27 3 28 TUBE SOCKET VOLTAGES For Pedai Generator Stamped Type RTA For voltages of other models see corresponding schematic diagrams These readings are taken with a 1000 ohms per voit meter having three scales of 50 250 and 1000 volts All voitages are taken with 117 volt line and deviations of as much as 20 per cen
121. Figure 284 Schematic P 9 63 Models 28 40 08 40 entry Schematic later units Models P40 0 40 Models P 40 0 40 Figure 2 Schematic 3 58 Model 20 PR 20 Schematic POWER AMPLIFIERS USED IN CONSOLES MODEL A 100 Figure 32 Winnog Figura 33 Model 0 100 Figura 38 REVERRERATION AMPLIFIERR USED IN CONSOLES A 100 Figure 34 Figure 35 Figure 354 TROURLE LOCATIOR Trouble Shooting Sectionslizing Trouble Shooting Chart Repair amp Disassarnbly of Vibrato Scanner 351 3 56 SECTIOR ALIGNMENT PROCEDURES Prasat Pane Selection Alignment of Coil Assemblies Adjustment of Percussion Cut Off Control Adjustment of Intermittent or Non Operating Keys SECTIOR V STAGE DATA FINAL TESTING 5 1 Detsiled Theory of Operation Replacement of Components SECTION VI PARTS LIST B 3 3 5 Unique Parts for other Mo n Tone Cabinets PR AQ MODEL HOME MODELS BC 2 AND B 3 NODELS amp AB PRODUCTION JUNE 1935 TO OCTOBER 1938 CABINET SIZE 48 1 2 WIDE 47 HIGH 38 1 2 DEEP FINISH AMERICAN WALNUT MANUALS 1 SWELL AND GREAT 61 PLAYING KEYS FACH PEDAL KEYBOARDS 25 RADIATING DETACHABLE TONAL 9 PRESET KEYS AND 2 SETS OF 9 ADJ
122. G INFORMATION PERTAIN SPECIFICALLY TO THE MODELS 8 3 amp C 3 HOWEVER DUE TO THE SIMILARITY OF THE CONSOLE MODELS THIS MANUAL MUCH OF THE INFORMATION WILL APPLY TO THEM ASLO ALIGNMENT PROCEDURES 4 1 PRESET PANEL TONE SELECTION 4 2 The preset keys shown in figure I 2 are used to select the ready mixed tone colors Nine color coded wires from each preset key are fastened to the bus bars of the preset panel by slotted screws Each group of nine color coded wires is fed through individual holes below the preset panel The color coding of each group is identical to the color coding of the nine wires from the drawbars above the preset panel The drawbars can be withdrawn to numbered stops The frequency relationship of the wire color coding is indicated below Note that the color sequence is the same as color code for Tesistors Snb fundamental Sub 3rd harmonic ER ER Fundamental 2nd harmonic 3rd harmonic 4th harmonic 5th harmonic 6th harmonic 8th harmonic 4 3 The tone color or quality of any played on either the upper or lower manual is determined by the intensity of the harmonics in relation to the fundamental note as selected either by the preset key or drawbars The num bers of the preset panel and drawbars indicate a progressive increase in intensity starting from 0 drawbar fully pushed in to 8 inclusive Any tone color may be identified by a number c
123. GE 21 Model RT 3 Win fou Figure Schemauc B 3 C 3 amp RT 3 SEE PAGE 24 3 12 PEDAL BOLD UAIT Generel Winng Diagrama Block Diagrams Figure 1 amp 18 Model RT Schematic Model AT 2 Schemetic Tuba Voltages Saraca Suggestions Removing Parts Parts R Winng Diagrams Pedal Solo Generator 331 Figure 4 48 46 3 32 AMPLIFICATION SYSTEM Pro Amohfier Schamatice Model Figure Models amp 6 Figure 2 6 3 ModelsA 3 0 Player amp 5 7 3 37 Models AV CV DV 4 ooo Model Figura 7 Figure 3 amp A POWER amp MPLIFIER SCHEMATICS PADE USED IN TONE CABINETS Models 5 20 40 8 40 40 Figure 10 3 40 Models amp 20 4 40 B40 C 40 0 20 08 20 6 0 26 Figure 11 3 40 Models 0 20 08 20 B 40 20 FR 20 40 Figure 12 Models 0 20 F 40 FR 40 Figura 13 Models 08 20 ER 20 FR 40 Figure 14 Models H 40 HR 40 Figure 15 Models H 40 HA 40 Figure 16 REVERB PRE AMPLIFIERE SCHEMATICS 08 26 20 Figure 17 Models 08 20 20 FR 40 Figure 13 POWER AMPLIFIER SCHEMATIC USED TONE CABINETS MODELS H 40 HR 40 1S Models 40 40 198 PRE SMPLIFIER SCHEMATICS Models B 2 C 2 RT 2 Figure 2
124. HEOSTAT BOX CONNECTIONS MODEL 0 FIGURE 3 43 MEG OHM TREMULANT CONTROL TREM 25 SWITCH 009MFD IMFO R3 4 MEG EXPRESSION PEOAL RHEOSTAT 44 MEG C4 FROM MATCHING TRANSFORMER PRE AMPLIFIER CIRCUIT OF RHEOSTAT BOX MODEL B BA BC C D G FIGURE 4 2 29 2 30 MATCH TRANS PREAMP RED CONNECTS 13 or 15 BLACK PREAMP SHIELD MATCH TRANS GROUND SHIELD GROUND RHEOSTAT BOX CONNECTIONS MODELS AV BV BCV CV DV GV RT CONSOLES FIGURE MATCHING INDUCTANCE CONNECTION FOR TRANSFORMER COIL L26 INCREASED OUTPUT PREAMPLIFIER 2 2200 2 EXPRESSION RHEOSTAT CONNECTION FOR REDUCED OUTPUT CIRCUIT OF RHEOSTAT BOX MODELS AV BV BCV CV DV GV RT CONSOLES FIGURE 6 GREAT MANUAL SWELL MANUAL TREM SWITCH EXPRESSION EXPRESSION MATCH TRANS PRE AMP TREM GONIR RHEO GROUND RHEO GROUND TREM CONTR PREAMP MATCH TRANS 5 Bo 52 TREM SWITCH SINIMA MOVIE 3 PRE AMP RED 7 TREM CONTR RED 9 MATCH TRANS BLACK 0 CONTR BLACK 12 SWITCH BLACK BOX CONNECTIONS MODEL E CONSOLE FIGURE SWELL TREM SWITCH ON CHORUS GEN a TREMULANT y
125. Juv 6 ay iss E Monee INPUT FIGURE 22A POWER AMPLIFIER 0 5 uses 20 CABINETS CODE AMPLIFIER CABINET GBRIAL SERIE AND AMAVA 3 e er view oF ALL WILTABES ARE ERAM UNLESS ATHERWISE ALL MEASURED WITH OHMS FEE YLT METER TREBLE CHANNEL menny Put usta w CABINETS 1 3 49 3 50 UR ARS meu Sw OF 3 eae OF PREAMPLIFIER i mU EE POWER SUPPLY PREAMPLIFIER TYPE AO 29 C MUT eeeeeee y 5 z L E pe s OAL gam cae se ies Sa AT te teen are Salsa AMPLOIEA USEDIN FR 48 ANO OA 4 TONE CABINETS 3 51 NOL 02 ud ISN USI 2 68 07 8274 SLO auut Onday S IONIGA Aun 300104 QXNDOWO 297
126. L CIRCUITS MODEL A CONSOLES SERIAL NO 2500 2876 MODEL AND BC CONSOLES SERIAL NO 5076 TO 10549 MODEL PLAYER CONSOLES ALL MODEL C CONSOLES SERIAL NO 1200 1247 MODEL 0 CONSOLES SERIAL NO TO 3143 05 2014 FOR PEDAL WIRING SEE FIGURE 13 COLUMNS 1 4 5 6 8 3 10 1 2 21 FOR WIRING SEE FIGURE COLUMNS 3 4 5 6 8 9 0 1 WIRES TO PEDAL FIGURE 0 PEDAL CIRCUITS MODEL CONSOLES SERIAL 2477 TO 2711 MODEL B amp C ANO BY CONSOLES SERIAL NO 10550 TO 17074 MODEL CY CONSOLES SERIAL NO 124 17074 08 2015 MODEL AND CONSOLES SERIAL NO 344 TO 17074 MODEL G CONSDLES ALL __ RESISTOR PANEL FIGURE 11 PEDAL CIRCUITS MODEL AND CONSOLES SERIAL NO 17015 20267 MODEL RT CONSOLES SERIAL NO 01204 MODEL 8 2 AND C 2 CONSOLES SERIAL 35000 AND ABOVE MODEL B 3 AND C 3 CONSOLES SERIAL NO 56005 AND ABOVE MODEL RT 2 CONSOLES SERIAL NO 1900 AND ABOVE MODEL AT 3 CONSOLES SERIAL NO 4000 ANO ABOVE FOR PEDAL WIRING SEE FIGURE 13 COLUMNS 1 3 4 6 0h os 2016 FIRST PEDAL EL GREAT MAN BUS BARS SECOND PEDAL DRAWRAR PEDAL KEY TOE PISTON TOE PISTON 1 150 OHMS TOE PISTON 4 TOE PISTON 5 16th HARM 82 OHMS 12th HARM 68 OHMS mm uL 39 OHMS Hi TO GENERATO amp TERMINAL STRIP HARM 6th HARM 4th HARM PEDAL BUS SARS OHMS HARM 12 OHMS 1
127. MBOL FUNCTION PART NUMBER T1 Power 115V 60 cy T Power 115V 50 60 cy Ti Power 230V 50 60 cy 003 021320 003 T2 Audio T3 Output Be S Lre entem URGE CHASSIS 2 M p Hey 7 ate MEZ e sa EE t Eius REFERENCE STATOR PEDAL SCO wit Sone MANE 43 _ Figure UNDERSOE OF PEDAL SOLO GENERATOR RTA 3 31 3 32 REFERENCE SYMBOLS FOR COMPONENTS REFER YS PEDAL SOLO SONI SCHEMATIC FIGURE 2 FIGURE 4B UNDERSIDE OF PEDAL S LO GENERATOR TYPE RTA 9 ppm V SPA B EARLY UNITS OF THESE TYRES HAD ENIE NES w RED TYPE ATR NEAREST TO CHASSIS R2 REFERENCE SYMBOLS FOR COMPONENTS TU PEDAL SOLE OMIT Sere MAIE FIGURE 2 FIGURE UNDERSIDE OF PEDAL SOLO GENERATOR RTC AND ABOVE PEDAL SOLO ON 32 BOURDON 32 BOMBARDE MUTE 5 WHITE TO PEDAL SWITCH OR 15 o Tm HITE 15 OR PEDAL SWITCH 5 3 BLUE 272 T3 BLUE 9 T3GREEN O BLUE 14 GREY RIS GREEN eee GREEN RED BROWN T3
128. NE 1 GEN 1000 OHMS 230V LINE 2 GEN 500 OHMS FIGURE 1 SWITCH AND MOTOR CIRCUITS 2 15 2 16 BLACK BLUE OF OTHES MODELS 1 YELLOW 9 SWITCH USED IN LATE MODEL 6 2 ETC TWO TYPES OF RUN SWITCHES WIRE WOUNO RESISTOR OOOO OOO QUOD 000 STARTING MOTOR YELLOW RUN SWITCH YELLOW START SWITCH BROWN RUN SWITCH BROWN STARTING MOTOR GREY PREAMPLIFIER GREY SYNCHRONOUS MOTOR 1 OR BLUE RUN SWITCH BLUE SYNCHRONOUS MOTOR 1 RED 1 BLACK OR BLUE PREAMPLIFIER BLUE START SWITCH BLACK SWITCH BLACK LINE CORD BLACK 3 LINE CORD GREY _ LINE PANEL EARLY CONSOLES WIRE WOUND RESISTOR STARTING MOTOR YELLOW RUN SWITCH YELLOW START SWITCH k RUN SWITCH BROWN STARTING MOTOR BROWN OR GREY PREAMPLIFIER BLACK OR GREY PEDAL LIGHT AND HEATER BLACK SYNCHRONOUS MOTOR 1 1 BLACK OR BLUE FIG 4 BLUE RUH SWITCH SYNCHRONOUS MOTOR 1 RED 1 BLACK OR BLUE BLUE PREAMPLIFIER EOAL LIGHT amp HEATER BLACK BLACK START SWITCH BLACK RUN SWITCH BLACK LINE CORD BLACK OR GREY LINE CORD LINE PANEL LATER CONSOLES Manuals and Pedals Figure 1 A TYPICAL MANUAL CHASSIS ASSEMBLY Model B 2 For Description of Controls See Section 2 Manual Chassis Assembly Models AV B
129. NNYDS 13740 1 7 3234 om 16 3 HARMONIC CONTROLS 4 gi gung T COOPER UPPER MANUAL 43 HE 33 14 48 HEATER RESISTOR CONNECT TERMINALE SHOWN WHEN USED FO watoz Prim T TRES moe r TI STARTING MOTOR EN 1 1SLACK OR BLUE 5 MOTOR GEM TREE ISLACK ox ALIE GREY MOTOR 4 GEM YELLOW TOMAINSEN GND E 79 CORRESPONGING FILTER INPUT TERMINAL MAIN GENERATOR a SACHA LE CHORUS rdt E PEE AMPLIFIER dus zav EER KET A CLINE 3 18 PeEDET BUTTONS khe hha bhp bbe Eb hEnphhk TELE M hann MOM BARS INDICATE gr FLT ER I9 LEFT VEWES SF CONSOLE BLACK P Se i m TREMULART jean s 68 al ry 1 E oe ey
130. OMESTIC 120V 60CY 003 024956 EXPORT 220 50 003 036756 OUTPUT TRANSFORMER A0 35 0 44 4 003 036552 FILTER CAPACITOR AQ 35 450 040200 A0 44 MINIATURE LAHP GE 12 6 3 15 016 022885 LAHP HOLDER POTENTIOMETER 40 44 R27 2K TRANSISTOR 0 44 001 021260 FUSE 44 ONLY DOMESTIC 3 4 016 039512 EXPORT 3 8A VACUUM TUBES 504 5 3 002 005201 ECC83 12AX7 002 012301 6895 002 006700 281 6 4 002 006200 ECL86 6GW8 002 006401 2 REVERB UNIT HODEL 100 amp 100 121 000046 3 POWER SUPPLY HODEL D100 NOTE THE POWER SUPPLY OF THE D100 IS SIMILAR TO THE POWER SUPPLY USED ON TME MODEL PR 40 TONE CABINET FOR PART INFORMATION REFER TO PAGE 6 17 OF THE B 3 C 3 PARTS LIST SPEAKERS MODEL A100 REVERB 12 8 014 024676 ORGAN 12 8 OHM 2 USED 014 023232 HODEL 0100 REVERB amp TREBLE 8 8 014 025397 BASS 12 8 OHH 2 USED 014 021270 PEDAL SOLO GENERATOR 0100 S Cec 114 000002 POWER TRANSFORMER AUDIO TRANSFORMER 2 FILTER CAPACITOR 40 20 20MFD 400V 450 040200 20MFD 400V MULTI CONNECTOR 005 019113 MULTI CONNECTOR MALE 005 019081 TUBE SOCKET 13 USED 004 018934 VACUUM TUBES 675 65 7 1 000 000006 51 7 6587 002 006306 6SC7 002 006305 PEDAL SOLO TUNER ASSEMBLY MODEL 0100 amp RT NOTE PARTS FOR PEDAL TUNER ARE NO LONGER AVAILABLE
131. Output Transformer 1 24 0 SERIAL NUMBER 8562 TO 739 INCL T 5 Filament Transformer AQ 31 1 37 amp R 99 omitted a early pre amplifiers of thus anriea PRE AMPLIFIER FIGURE 9 3 39 INPUT FROM AMPLIFIER a m Le 30 975 E id SPEAKER FIELD 250 OHMS Filter choke shma Radio frequency choke Power transformer Output transiormer Primary 120 ohma pc RESI D pane AQ 16682 AO 10070 1 AO 16681 1 femstanee Power traaxfarmec T2 wansformer Prim 120 olens Sec D 1 1 Filter choke 40 ahma 26652 12 L2 chakr AQ 16663 0 2 AO x Rs 50 000 TANCE POWER AMPLIFIER FIGURE 10 USED IN POWER CABINETS 4 20 SERIAL NO 1000 AND ABOVE 3540 SERIAL 2400 amp ABOVE 40 SERIAL 2400 TO 19841 NCL 40 SERIAL 2400 amp ABOVE 1 20 SERIAL 4348 TO 25109 INCL DR20 SERIAL 15 007 TO 22 399 INCL 5 ALL DX20 ALL 40 2 680 0 Lazy 50 900 6 4 USED IN POWER CABINETS A 20 SERIAL 1 TO 999 NCL 2 40 B 40 k C 401 TO 2399 INCL A 20 cab neta SERIAL NO 1 601 40 k B 40 cabinets SERIAL 1 1730 have condenser 1 mid and resistor RA 2 MEG SPEAKER FIELD 5000 OHMS EPEAKERFIELD 250 OHMS SPEAKER PLUGS FRONT VIEW PUT RECCPTACLES VIER 564 727
132. RATO 12 TONEBAR ASSEMBLY s UPPER AND LOWER KEYBOARD ASSEMBLY PEDAL SOLO ENO BLOCK 9 PEDAL KEYBOARD ASSEMBLY G TRANSFORMER 6 ee NETS GENERATOR seseo PREAMPLIFIER gt PEDAL SWITCH ASSEMBLY AMPLIFIERS REVERB AMPLIFIER REVERB UNIT POWER SUPPLY SPEAKERS PEDAL SOLO GENERATOR PEDAL SOLO TUNER VIBRATO LINE oo VOLUME CONTROL ASSEMBLY RHEOSTAT BOX EXPRESSION PEDAL s eee 000000060 FEAR VIEW t REAR VILW gt ASSEMBLY 1 KNOBS 025 035570 IVORY 025 035571 BROWN 025 035572 PARTS FOR EARLY RATCHET CLICK TYPE TONEBAR ASSEMBLY ARE NO LONGER AVAILABLE FOR PART INFORMATION ON LATER SERIES TONEBAR ASSEMBLY SEE PAGE 6 7 OF 3 3 PARTS LIST UPPER amp LOWER KEYBOARD ASSEMBLY 1 VIBRATO CHORUS SWITCH MODEL BV CV RT 008 016988 2 FRONT STRIP ASSEMBLY LOWER MODEL RT D100 061 035813 NOTE MOST PARTS ARE SIMILAR TO PARTS USED IN THE UKB amp LKB OF THE MODEL B 3 OR C 3 FOR PART INFORMATION SEE PAGES 6 8 AND 6 9 OF THE B 3 C 3 PARTS LIST PEDAL SOLO ENDBLOCK 1 POTENTIONETER VOLUME 500 676 000221 2 OUTPUT TRANSFORMER 003 025348 PEDAL KEYBOARD ASSEMBLY 32 PEDAL 1 PEDAL CAPS BLACK 025 002664 2 SWITCH PUSHER
133. RED 3 ORANGE 4 GREEN E E 5 Came oy RBZ RID ie 4 ti D 1 TEE BLACK TO O BUS BAR TO GREEN 5 BUS ES lt 7 VIEW OF 7 x X CABLE SIDE OF PLUG WHITE TO PEDAL SWITCH REFERENCE SYMBOLS FOR COMPONENTS REFER TO PEDAL SOLO UNIT SCHEMATIC FIGURE 2 FIGURE UNOERSIDE OF PEDAL SOLO CONTROL PANEL 3 33 AMPLIFICATION THE AMPLIFICATION SYSTEM The electrical impulses which produce the tones of the Hammond Organ ars given their original amplification by a preamplifier located in the console and are then transmitted to the power amplifiers which are located in the tone cabi nets It will be noted that no power transformer included in the preamplifiere showo in figuree 1 through 9 the required plate current being supplied by the power amplifier in the first tone cabinet Later models of preamplifiere have 2 complete power supply incorporated within them A tone control is included in all preamplifiers whereby the relative intensity of the high and low frequencies may be changed to suit acoustical conditions by varying the amplitude of the higher frequencies On tremulant equipped consoles this control will be found under screw cap located toward the right end of the chassis while on consoles equipped with the Hammond Vibraio this tone
134. REDI TB CONSOLE CABLE 430 040200 002 005201 122000013 27 000015 005 015141 011 0 000022 05 0160 05 01514 054 005 011 03575 12 FIGURE 14 POWER SUPPLY ASSEMBLY POWER TRANGFORHER 115 VOLT 6OHZ POWER TRANSFORMER 230 VOLT SOH2 FILTER CHORE RESISTOR WIRE WOUND 10W ELECT CAPACITOR 50 450 POWER AMPLIFIER ASSEMBLY CAPACITOR 10 000 sf CAPACITOR FILM D 22 400V FKSISTAR ZTO RESISTOR 130 DHM 3W RESISTOR 100 RESISTOR 22K RESISTOR 100K IW RESISTOR 250 RESISTUR 15K RESISTOR IW RESISTOR 120K CERAMIC CAP 20 000 RESISTOR 3 3 MEG CERAMIC CAP 100 CERAMIC 150K CERAMIC CAP 4 7K CERAMIC CAP 47K CERAMIC CAP 270K RESIST K iw CAPACITOR CERAMIC 220001 FILM RESISTOR CAPACITOR FILM 0 0 2007 RESISTOR 200K RESISTOR 33K RESISTOR AK RESISTOR ELECT 3 50 ELECT CAP ELECT CAP 330K ELECT 560W RESISTOR 2 7 CERAMIC CAP 2200 CERAMIC CAP 2500 CERAMIC 1200 1 CERAMIC CAP 4700 CAPACITOR FIXED FILM 1 220K CAPACITOR FILN O 1 100V CAPACITOR FILM 0047 1004 MESISTOR 1 2 MEG MESISTOR 68K ELECT 100 34 CAPACITOR FILM 4700 of RESISTOR 18K RESISTOR 270 OHMS 126 000010 425 010752 603 030612 602 030072 602 050042 603 060101 400 02
135. RY PLATES P REMOVING SCREWS WHEN REMOVING THE STATION ARY PLATES FROM THE ASSEMBLY YOU WILL NOTICE THAT THERE ARE INSULATOR S AND ON BOTH SIDES OF THE MAIN ASSEMBLY CHASSIS INSULATING THE STATIONARY PLATES FROM THE ASSEMBLY 0 THEN REMOVE THE ROTOR ASSEMBLY 0 BY LOOSENING THE TWO 2 BRISTOL TYPE SET SCREWS V TO AVOID DAMAGING THE ROTOR CONTACT PIN DURING DISASSEMBLY REMOVE THE REMAINING 14 STATIONARY PLATES AND INSULATORS CLEAN THE STATIONARY PLATES ROTOR PLATES AND OTHER METAL PARTS USING A FREON SPRAY OR OTHER CLEANING SOLVENTS THAT DO NOT LEAVE ANY RESIDUE AFTER DRYING AN ABSORBENT CLOTH OR SWAB CAN BE USED IN CONJUNCTION WITH THE CLEANER RAY META C Di CAUTION DO NOT ALLOW SPRAY T0 ON OIL READS OR ROTOR PIN IN MOST SCANNER REPAIR YOU NEED NOT GO FURTHER IN DISASSEMBLY THAN STEP NUMBER ELEVEN BUT SHOULD CONDITIONS WARRANT FURTHER DISASSEMBLY CONTINUE WITH NUMBER 15 OTHERWISE INSTALL NEW INSULATORS AND REASSEMBLE THE SCANNER IN REMOVING THE GEAR HOUSING ASSEMBLY THERE FOUR 4 screws X HOLDING THE ASSEMBLY ON TO THE MAIN ASSEMBLY CHASSIS 0 UPON REMOVING THE GEAR HOUSING ASSEMBLY YOU WILL NOTICE THE BAKELITE GEAR AND SHAFT ASSEMBLY THE SPRINGS ON EITHER SIDE OF THE BAKELITE GEAR ALSO INTERMESHES WITH THE METAL GEAR OF THE SYNCHRONOUS MOTOR TO ORIVE THE SCANNER TO REASSEMBLE THF SCANNER REVERSE THIS PROCEDURE SECTION IV NOTE THE FOLLOWIN
136. System SECTION INSTALLATION ABO TECHBICAL INFORMATION ACOUSTICS ote rem neo 2 1 General Instaltetion 24 Reverberation 22 IBSTALLATION 5 MAINTEBABCE CABLED 24 Block Diagrams 24 Winng iegrams 2 5 Block Diagrams 2 5 Figures 1 thru 11 Thre 2 8 GENERATOR FIOURS 1 91 Frequency Generetor 2 8 82 Frequency Genaretor 2 11 Model M Generator 212 Generstor Blustratioss 2 aq hk 2 12 CHORUS GENERATOR Modals BC 0 5 Miustrations Figura 1 thru 2 14 CONSOLE POWER WIRING PAGE Motor Circuits Figure 1 215 Run Switches Figure 2 we 2 18 Sida Panel Figura 3 5 4 2 16 amp PEOALS Manual Assembly Figure 1 62 22 Manual Chassis Motels A CV 0 DV GV 2 17 Key Contact Spong Figura 2 2 17 Manual Contacts Figure 3 2 17 Manus Chassis Models 8 2 C 2 RT 2 Models E 3 3 RT 3 A 100 0 100 218 2 18 2 18 Manue Winng Models B C CV 0 Models B 2 3 2 AT 2 3 8100 0 100 2 18 Model Senes Kay amp Frequency Chert Figure 4 Switch Assombly Figure 6
137. The preset panel consists of 2 sets of 9 bus bars which correspond to those in the drawbar assembly and which are connected to the same taps on the mixing trans formers 5 35 The mixing transformers are mounted on the manual chassis assembly as shown in figure 1 4 Shielded leads carry the signals from the secondaries of these transformers to the pre amplifier 5 36 PEDAL SWITCH ASSEMBLY The pedal switch assembly is similar in operation to the manual chassis assembly reference paragraphs 5 3 to 5 35 inclusive the pedal switch assem bly however contains only 4 bus bars instead of 9 A flat spring at the end of each pedal of the detachable pedal clavier depresses a small plunger as shown in figure 3 2 on the pedal switch assembly and actuates a double set of contact springs thus making eight contacts available for cach note The pedal contact springs are connected by decoupling resistance 5 7 wires to terminals A cable connects these ter minals through a wiring tube to the proper terminals on the main tone generator strip The pedal switch bus bars are connected by means of four colored wires through a filter reactor and resistor network to the pedal drawbars See figure 5 9 The reactor and resistors filter out undesirable higher harmonies and serve to balance the pedal tones RESISTANCE WIRES SWITCH SEPARATOR Figure 5 9 Pedal Switch Contacts 5 37 VOLUME CONTROL AND PRE AMPLIFIER ASSEMBLY
138. USTABLE CONTROLS HARMONIC DKAWBAKS FOR EACH MANUAL 2 AD JUSTARLE DRAWBARS 16 AND 8 FOR PEDALS ONE EXPRESSION PEDAL CONTROLLING SWELL EXPRESSION GREAT AND PEDALS FEATURES ONE TONE GENERATOR ONE ADJUSTABLE TREMULANT AFFECTING BOTH MANUALS AND FEDALS EQUALLY AC INPUT APPROX 30 WATTS PLUS WATTAGE REQUIRED BY TONE CABINETS WEIGHT AS ILLUSTRATED APPROX 359 POUNDS SERIAL NO 250 AND ABOVE USED LARGER WOODWORK CASE DE SIGMATED AS AB SEE B SERIES FOR CASE DIMENSIONS AND WEIGHT MODEL AB SAME AS MODEL ENCLOSED IN LARGER WOODWORK ONE TONE GENERATOR ONE ADJUSTABLE TREMULANT FECTING BOTH MANUALS AND PEDALS EQUALLY CABINET WITH PEDAL KEYBOARD AND BENCH 48 3 4 WIDE SIZE 49 1 2 DEEP 46 HIGH MODEL BCs IR PEODUCTION DECEMBER 1936 TO NOVEMBER 1942 SAME AS NODEL AB BUT WITH ONE ADDITIONAL GENER ATOR AND APPROPRIATE SWITCHING TO CREATE CHORUS FINISHs WALNUT MODEL BV IN PRODUCTION APRIL 1946 TO DECEMBER 1949 SAME AS MODEL BUT EQUIPPED WITH HAMMOND VIN RATO PROVIDING THREE DEGREES OF TRUE VIBRATO AND OFF POSITION EFFECTIVE SIMULTANEOUSLY ON BOTH MANUALS TOGETHER WITH VINKATO CHORUS USABLE IN THREE DIFFERENT DEGREES AND FINISH WALNUT MODEL BCVi IN PRODUCTION DECEMBER 1949 TO DECEMBER 1954 AS MODEL EC BUT HAS HAMMOND VIBRATO AND VIBRATO CHORUS NONE PRODUCED CONVERTED BY VIBRATO RIT ADDED AFTER 1945 MODEL B 2 SAME AS MODEL BV BUT
139. WOODWORK IS DESIGNED FOR USE IN HOMES WHERE MORE ARTISTIC INET IS PREFERRED MODEL ER 20 TONE CABINET n o IN PRODUCTION JANUARY 1948 TO DECEMBER 1957 CABINET SIZE 32 15 16 WIDE 39 3 15 RICH 28 3 8 DEEP FINISH MALNUT STAIN WEIGHT T 40 208 LBS FR 40 228 LBS OUTPUT 40 WATTS 2 AMPLIFIERS 12 SPEAKERS AC INPUT APPROXIMATELY 300 WATTS THE 40 REPLACES THE 9 40 TONE CABINET DIMENSIONS OF THE WOODWORK HAVE BEEN ALTERED SO THAT A REVERBERATION UNIT RE ACCOMMODATED WITH THE ADDITION OF THE REVERBERATION UNIT IS DESIGNATED AS FR 40 MODEL F 40 AND FR 40 TONE CABINET MODEL PR 40 MODEL PR 4Ot IN PRODUCTION FEBRUARY 1959 CABINET SIZE 31 1 2 WIDE 37 1 2 HIGH 18 DEEP FINISH WALNUT OAK CHERRY WEIGHT 130 POUNDS MODEL GR 40 IN PRODUCTION JUNE 1959 CABINET SIZE 31 WIDE 36 5 B HIGH 17 1 4 DEEP WEIGHT 121 POUNDS INPUT 220 WATTS OUTPUT 50 WATTS E I MODEL QR 40 EQUIPPED WITH TWO 15 SPEAKERS FOR BASS TONES AND TWO 12 SPEAKERS FOR THE TREBLE TONES THEY PROVIDE THREE DIMENSION AMPLIFICATION WHICH CREATES A BEAUTIFUL VEKBERATION EFFECT IN STEREO THESE CABINETS FEATURE THE NEW AND IMPROVED HAMMOND REVERBERATION CONTROL FOR BOTH BASS AND TREBLE TONES CONVENIENT OUTSIDE CONTROLS MAKE IT EASY TO CHANGE THE DEGREE OF REVERSERATION FOR EACH THE QR 40 IS ELECTRICALLY SIMILAR TO THE PR 40 BUT WITH 115 UTILITY TYPE CABINET 15 ONLY US
140. XIMATELY 360 WAITS THE 40 CABINET HAS A WIDE VARIETY OF APPLICATIONS IT IS ESPECIALLY ADAPTEO FOR USE IN ENCLOSURES WHERE THE INDIRECT PROJECTION OF SOUND IS DESIRABLE VERY OFTEN THK CEILING AND PLOOR ARE THE ONLY LIVE OR REFLECTING SURFACES AND THIS TYPE CABINET MAKES USE THE C 40 CABINET IS USED INDIVIDUALLY OR GROUPS OF TWO OR MORE IN PRODUCTION OCTOBER 1937 TO MARCH 1952 TONALLY IDENTICAL WITH MODEL C 20 THE D 20 FILLS A NEED AN INEXPENSIVE CABINET POR USE IN A WIDE VARIETY OF INSTALLATIONS WHERE DECORATIVE QUALITIES ARE A SECONDARI CONSID ERATION IN FRODUCTION OCTOBER 1938 TO JUNE 1942 EQUIPPED WITH ROTOR TREMULANT IN PRODUCTION AUGUST 1939 TO MARCH 1952 EQUIFPED WITH REVERBERATION UNIT MODEL DXR 201 CABINET SIZE FINISH WEIGHT OUTPUT AC INPUT IN PRODUCTION APRIL 1939 TO JUNE 1945 EQUIFPED WITH ROTOR TREMULANT AND REVER BERATION UNIT 28 WIDE 56 HIGH 16 3 4 DEEP FACE AND SIDES OE AMERICAN WALNUT 149 POUNDS D 20 171 POUNDS 08 20 178 POUNDS DXR 20 20 WATTS 1 AMPLIFIZR 2 12 SPEAKERS APPROXIMATELY 200 WATTS MODEL 20 PRODUCTION MARCH 1947 TO DECEMBER 1950 CABINET 31 WIDE 38 3 4 HIGH 18 DEEP SIZE FINISH WALNUT WEIGHT 144 POUNDS OUTPUT s 20 WATTS 1 AMPLIFIER 2 12 SPEAKERS INPUT APPROXIMATELY 200 WATTS THE ER 20 TONE CABINET 15 ELECTRICALLY EQUIVALENT TO THE DR 20 TONE CABINET HOWEVER THE
141. adjust key drawbar wire to input of percussion amplifler terminal H and amplified by T4 and V5 Besides provid ing push pull signal for the control tube V7 the percussion input transformer T5 has third winding which eeds the signal back to the 2nd or 3rd harmonic drawbar through equivalent key circuit resistor R50 and terminal Thus the signal that was borrowed irom the 2nd or 3rd harmonic drawbar or the per cussion amplifier is replaced When a key is depressed the signal first sounds loudly through the control tube transformer a high pass filter and terminal D to the grid of V4 Immediate ly condenser C31 n the control tube grid circuit begins to discharge causing the signal to fade away Terminal approximately 25 volts is connected to the 8th harmonic adjust key drawbar wire which is connected to manual busbar When an upper manual key is pressed terminal K is grounded through the tone generator ilters This virtually grounds the plate of connected as a diode stops conduction and isolates cathode and centrol tube grid circuit The grid then drifts from approximately 25 volts to about 15 volts at a rate determined by the time required for C31 to discharge through R57 and R58 At the com pletion of this sequence the percussion signalis blocked No urther percussion effects occur until all keys of the upper manual are released and control grids can again rise to 25 volts The rate of this rise is fi
142. alue This period 18 about two seconds m duration The other two springs operate in simular fashion but their reflections occur at longer time intervals 1 17 and 1 15 second res pectively The amount of damping for each of the three springs is pro portioned that they have a uniform decay rate OPERATION IN PR AND QR SERIES TONE CABINETS Tbe dry type reverberation device mounted m the PR and QR series tone cabinet functions follows Part of the console is applied to the re verberation driver and the resultant reverberated signal at the pickup 18 separated into two frequency bands one occupying the spectrum from thirty two to two hundred cyclea and the other from two hundred cycles to eix thousand cycles The low frequency reverberated signala are mixed with the direct console signals amplified and fed to the low frequency speakers Tbe high frequency or treble reverbe rated eignals are amplified and fed to separate speaker system while the treble signals from the console are aleo amplified and fed into another speaker system In other worda the low frequency direct and reverberated signals are electrically mixed and the high frequency direct and reverberated signals are acoustically mixed Two selector switches are mounted on the aide of the PR and QR series tone cabinets to provide variation in the amount of reverberation produced The bass reverberation switch provides increased direct output as the amoun
143. and a capacity type pickup or scanner variation It is comparable to the effect pro which is motor driven so that it scans back and duced when a violinist moves his finger back and forth along the line forth on a string while playing varying the fre quency while maintaining constant volume 5 17 Electrical waves fed into the line are shifted in phase by each line section the amount 5 16 The Hammond Organ vibrato equipment per section being proportional to frequency so as shown in simplified block diagram figure that at any tap on the line the phase is retarded 5 4 varies the frequency of all tones by con relative to the previons tap tinuously shifting their phase It includes a phase shift network or electrical time delay 5 18 The scanning pick up traveling along the line composed of a number of low pass filter line will thus encounter waves increasingly re deer SECTIONS OF VIBRATO LINE L FROM FIRST SECTION OF PREAMPLIFIER SIGNAL TO SECOND AMPLIFIER 5 OF PREAMPLIFIER Fignre 5 4 Fundamental Diagram of Vibrato System 5 4 tarded in phase at each successive tap and the signal it picks up will continuously change in phase The rate at which this phase shift occurs will depend on how many line sections are scanned each second 5 19 Since a cycle is equivalent to 360 elec trical degrees a frequency shift of 1 cycle Occurs for each 360 electrical degrees scanned per second F
144. any audience room such church or concert ball a reverberant auditorium less power 15 necessary and problems of sound distribu tlon are greatly simplified and therefore the best possible muzical resulte are usually obtained as a matter of course Unlortunately however lhe reverberation characteristics of an auditorium usually are not alterable by the Installation engineer and he must accept them good or bad as the case be A reverberation time of one second when two thirds capacity audience is present usually sufficient If reasonable care 15 laken in locating the organ equipment for proper distribution and balance although a slightly longer reverberation time Is often desir able It must be remembered that the reverberation time in any enclosure 15 greatly reduced when an audience is present In general the higher the ceiling of the audi torium the less effect the presence of an audience has on the reverberation time however this elfect always considerable If the natural reverberation in the auditorium 15 insufficient for best musical results from the organ another method must be used to properly reverberate the organ tones HAMMOND REVERBERATION CONTROL The Hammond Reverberation Unit provides an effective means of securing proper reverberation in all types of installations where the natural reverberation io the auditorium is insufficient Experience has shown that best installations in homes radio st
145. ately 2 3 4 1 2 chamber of volume but more cubical dorm would have a longer reverberation time while chamber of less cubical form would have a shorter reverberation time however dimensions in the above ratio usually are most desirable Chambers of complex shape or chambers of regular shape whose greatest dimension is more than three limes the least dimension should be avoided CHART SHOWING SIZE OF OPENING REQUIRED FOR REVERBERATION TIME OF ONE SECOND FOR CHAMBERS WITH DIMENSIONS IN RATIO OF 2 3 4 5 AREA OF TONE OPENING IN SOUARE FEET o 5 8 5 8 5 8 5 9 FR FF F SK VOLUME OF CHAMBER IN CUBIC FEET FIGURE 1 CONSTRUCTION AND FINISH Ali boundaries of a reverberation chamber should be of exceptionally rigid construc tion Concrete or heavy tile 15 ideal If the chamber is to be of frame construction the studs should not be over fourteen inches on centers Lath should be very securely nailed and the plaster should be hard and given a smooth finish coat TONE OPENINGS The reverberation time of an organ chamber is greatly influenced by the size of the tone opening For a chamber of given dimensions the reverberation time 1s increased as the area of the tone opening 15 reduced A large chamber therefore may have a large tone opening and still furnish sufficient reverberation whereas a small chamber might require a very smali opening
146. ation for each DIMENSIONS 37 1 2 High 31 1 2 Wide 18 Deep WEIGHT 130 Lbs The 40 18 electrically similar to the PR 40 but with ite utility type cabinet 18 only used where appearance 18 not a consideration such in tone and rever beration chambers The treble direct speaker s normally mounted inthe top In an unusual installation where the ceiling 16 very low or cabmets are stacked or radiation te otherwise restricted t 18 possible to move thie speaker to the bole provided in the front The metal diffuser in front of the apeaker must also be moved and the wooden cover muat be attached under the top to close the hole 17 1 4 Deep DIMENSIONS 31 Wide 36 5 8 High WEIGHT 121 Lbs TONE CABINET INSTRUCTIONS MODELS PR 20 ANO PR 40 THREE CHANNILS The asaplifer m this tone cabinet has three channels The bas channel drrves two 15 speakers and responde only to fre quencies below 200 cycles The treble re verberanon channel drives the lowrr 127 apeaker and covers the range above 200 cycles The treble direct channel driving the upper 12 speaker covers the range above 200 cycles REVERBERATION SWITCHES The relative amount of reverberation for the treble and channels can be lected by two recessed suntches located on the side of the cabmet Each switch has four postions When both switches are n the OFF postion the reverberation effect us completely ehiinated and all three channe
147. ation to the oscillator thus forming series of six notes having exact octave relationships The particular frequency divider or dividere selected for pounding through the amplifier and speaker system of the organ will depend upon which of the stop tablets are used control contact under each pedal causes the control tube to transmit the signal to the amplification system with e controlled rate of attach COMPONENTS OF THE PEOAL SOLO UNIT Electrically the pedal solo unit la very imilar in principle to the Hammond Solovos Model L although there are of course many differences It employes tuning coils tuning adjustment knobs a master oscillator and Irequency dividers similar to those in the Solovox and the stop tablets are similar in function to the register con trols of the Solovos solo generator 19 which looks hke an amplifier and contains the masier oscillator five frequency dividere an amplifier a control tube and a power It is located directly above the pedal switch assembly near the left stde of the conoole as viewed at the rear The tuning coll assembly contains 32 adjustable tnductance coils which tune the master oscillator to the frequencies of the 32 pedal notes It is mounted above the pedal ewitch assembly near the right side of the console as viewed at the rear The control panel with aight stop tablets and a volume control knob is mounted at the right end of t
148. be accomplished as follows a Remove the rear panel b At the power terminal panel on the gen erator unsolder the red and black wires which lead to the run motor that is to be replaced figure 4 1 c Unsolder 7 scanner wires from terminals on back of stop base and 2 scanner wires from line box d Remove shielded lead attached to SCAN at preamplifier The running motor is secured by four ma chine screws to the generator frame Remove the nuts and lockwashers and then disengage the flywheel coupling springs f Remove the entire motor and scanner assembly by means of a gentle pull g Secure a replacement motor and vibrato scanner assembly in place by reversing the pro cedures above 5 86 TONE GENERATOR FILTERS 5 87 Filters used for frequencies numbered 49 to 91 inclusive as referenced in paragraphs 5 9 to 5 11 inclusive are resonant reactor capacitor units and will be replaced as follows a Unsolder all leads b Remove the two screws holding the filter c Remove the component d Replace the component by reversing the procedures above 5 14 SECTION VI PARTS LIST PARTS ORDERING INFORMATION When ordering replacement parts from the Hammond Organ Company the following guidelines should be observed 1 Address all parts orders to HAMMOND ORGAN COMPANY PARTS DEPARTMENT 4200 W DIVERSEY CHICAGO IL 60639 2 All orders should specify the model and serial numbers of the instrume
149. cal scale 148 pitch or frequency depending on the number of teeth passing the magnet each second A note of the organ played on either manual or the pedal keyboard generally consists of a fundamental pitch and a number of harmonics or multiples of the fundamental frequency The fundamental and eight harmonics available on each playing key are individually controllable by means of drawbars and preset keys or buttons By suitable adjustment of these controls the player 18 enabled to vary the tone colors at will The resulting signal passes through the expression or volume control and through the preamplifier where vibrato 1s introduced to the tone cabinet Here reverberation 1s added electrically and a power amplifier feeds the signal into loud speakers DESCRIPTION A Hammond Organ console Fig 2 includes two manuals keyboards the lower or Great and the upper or Swell and a pedal keyboard of 25 keys The concert models have 32 key pedalboard and are constructed to A G O specifications Various controls have appeared on different models The eration of these controls 15 covered in the followmg paragraphs To start the organ hold the start switch Fig 1 position for approximately eight seconds Still holding it push the run switch to pos ition After leaving both switches on for about four seconds release the start switch to return to its normal position If the console is very cold
150. ce wires to the proper terminals on the terminal strip and carry the harmonics of the particular note with which they are associated Reference paragraph 1 20 The resistance wires avoid overloading of the generators and thus allow each generator to be used independently to feed a number of key circuits All key contacts are alive at all times When a playing key is depressed its 9 frequen cies are impressed on the 9 bus bars of the manual No wires are connected to these bus bars preset or adjust key must be depressed to complete the circuit See figure 3 3 Each preset or adjust key is provided with 9 contacts identical to those on the playing keys and is further provided with a locking and tripping mechanism the purpose of which is to permit only 1 preset or adjust key to be in operation at a time See figure 1 6 The cancel key re leases a depressed preset or adjust key this cancel key has no contacts 5 33 Flexible wires connect the 9 contacts of each adjust key A and B to the 9 drawbars contollled by the key The wires are color coded for identification Each drawbar makes contact according to the stop position to which it is drawn with any one of 9 bus bars connected to taps on the mixing transformer See figure 3 3 The bus bars correspond to different in tensities of sound 5 34 The 9 preset keys to A are connected by flexible leads to the preset panel in the back of the console See figure 1 4
151. certaxi that no piece of elec trical apparatus having a strong magnetic field close to the console for example an electric clock or a fluorescent light on the console can some cases produce loud hum in the speakers NOTE Always supply model dengna and senal number when writing the factory regarding the console the inne cabinet This information can be obtained from the nameplates CORE 5660069 ORGAN COMPANY 4200 W Giversey Ave Chicaga 39 Illinois 3OY4 LIXIN NO O1 50 21904 Ni 3HJLUMG HAIM 9318 9N TILAN Sy 9 3yv YA WS sonr EYLO Xi BOYINDA INI ZY YIP WALA BUY ONNOUD Wows Syris 5 1 E L WARD Li d AOL Jost aw eos Ly RO 74 S NEIN WARN 31ON 3002 4 304 SI3NISY2 07 80 97 84 NI 5 YIT Old 3138 3AOWY 2 3402 583 3 4 AH A 3e5 Sy Oot
152. cess ta lock Cabinet must be level and must not rock Flour must he hrm to wed vibration Contec onsoleto cabinet s shown Additional tone cabinets may cunnected this umt by using condueroe cabinet cabinet cable corncted to socket marked ADDITIONAL POWER AM PLIPIERS m Fig 1 Signal at this pot comes directly tmnm cinsle and does not have reverberation If cabinets not Type PR or QR inquire of suur Hammond dealer ue the factory Serv ke Department on use of isolating trans former tatal saput watttue of all excecds on cunsule name plate auubary power relay must be pro vided PR 20 TONE CABINET 20 Watt Output INPUT WATTAGE 185 Equipped with two 15 speakers for bass tones and two 12 speakers for the treble tones They provide three dimension amplification which creates a beautiful re verberation effect in Stereo These cab nets feature the and improved Hammond Reverberation control for both bass and treble tones Convenient outside controls make It easy to change the degree of reverberation for each DIMENSIONS WEIGHT 118 Lbs 31 1 2 Wide 37 1 2 High 18 Deep TONE CABINET INSTRUCTIONS MODELS PR 20 AND PR 40 THREE CHANNELS The ampbacr in thes tone cabinet has three channels The bass channel doves two 15 speakers and responds only to fre quences below 200 cycles The treble verberatiog channel dri
153. ch w ll permit turning the reverberation on and from the console without the use of additional cables Several different kita are available depending upon the type of console and the instruction sheet accompanying each kit describes tbe installation and operation These kite are designed for use with PR and QR series cabinets only SERVICE SUGGESTIONS Should no reverberation be evident in playing a tone cabinct equIpped with this device but a loud noise reaults from touching the springs it 15 quite likely that the locking device has not been completely opened Make sure that the springs of the unit are free of the clamps which are located near the driver and pickup If in moving tone cabinet a spring s disengaged from the driver or pickup the ends can again be reineerted in the loops For proper operation it 18 sug gested that the reverberation unit be removed for thia operation and the loose springs be allowed to hang quietly then the end should be picked up and in serted im the loop from which it became disengaged The purpose of this procedure 18 to eliminate any twist within the spring wbich could cause er ratic noises in operation because of torque which would be transferred ta the pickup portion REVERBERATION IN EARLIER TONE CABINETS On previous models of tone cabinets which installed without reverberation units and there is now e desire to add such a refinement it 18 necessary that the fluid type kits be
154. chart for the pedals showing the frequency numbers appear ing on each pedal contact 2 22A ACTUATOR FOR ONE KEY OB CONTACT SPRING KEYING BUSBAR FUNDAMENTAL 2ND 3RD HARMONIC 2ND HARMONIC 4TH HARMONIC 6TH HARMONIC 8TH HARMONIC 10TH HARMONIC BOTTOM CONTACT SPRING BOTTOM BUSBAR ARRANGEMENTS OF PEDAL BUSSES D 100 SERIES FIGURE 22 2ND PEDAL DRAWBAR Om s IST PEDAL DRAWBAR j 20 OHMS 5 OHMS RESISTOR RED IOTH HARMONIC 3RD HARMONIC BROWN ND amp HARMONICS 6TH amp 8TH HARMONICS FUNDAMENTAL amp TO PEDAL SWITCH PEDAL CIRCUITS FIGURE 23 2 22B B E Pedal E E 1 1 2 2 3 3 4 4 5 5 6 8 1 1 8 8 9 9 10 11 12 m Frequency Number FREQUENCIES USED IN PEDAL SWITCH FIGURE 24 Pedal Switch Busbar Shifters The pedal switch is equipped with busbar shifters similar to those the man uals The pedal busbar shifter is a slotted stud on the rear surface of the pedal switch near the right end as you look in at the back It should be adjusted as described under Manual Busbar Shifters on a previous page 2 22C Pedal Keyboard Pedal keys are set at the factory for average tension but are adjustable to fit the requirements of the individual organist Adjustment is accomplished by re moval of the top cover at the back of the pedal keyboard and setting the tension as des
155. ck of natural reverberation Adjustment of it therefore should be made in co operation with the organist who must understand its intent In large m stallations the use of two reverberation units will reduce room pattern to the point where it as negligible 2 41 Reproduction of caution tag attached to MOVING THE FLUID TYPE UNIT The reverberation unit appears to be a delicate device hut when once set np itis very dependable and requires no further attention When tone cabinet 18 moved even a few feet however the reverberation unit must be locked to avoid excessive vibration of the springs the cabinet is to be tilted the unit must removed to avoid spilling the fluid and replaced after moving 1f the unit itself cannot be kept upright while moving the fluid must be drained and later replaced Hammond damping fluid is a grade especially selected for this purpose and no other kind should be used Failure to lock the unit when moving usually necessitates replacement of complete driver assembly or the upper or lower lever assemblies which are a part of it When parts are replaced the springs must be balan ced ae follows In complete driver assembly ordered for replacement the wire passing through the unit from the upper lever to the stirrup is not soldered lt should be left unsoldered until this adjust mentis made Replace the drlver assembly and attach all the springs check and adjust the single damping tube
156. crews which hold the pedal switch in place and the screw which holds the swell pedal rod in place g Lift the cover board and remove the screws which hold the pedal switch assembly to the back rail of the console h Loosen the large bolt at each end of the pedal switch assembly then remove the nuts attached to these bolts Drop the assembly carefully and remove it i install a replacement pedal switch assembly in place by reversing the procedures above 5 78 MANUAL CHASSIS 5 79 Replacement of manual chassis will be accomplished as follows a Remove the rear panel of the console Reference paragraph 1 10 b Remove the four screws on the left and right hand side panels of the music rack c Lift the side panels to tilt the bottom of the rack and then remove the rack by pulling ontward d Remove the 4 chassis bolts under the con sole and the 2 machine screws under the front lower rail that secure the entire manual chassis in place e Disconnect all preamplifier leads f Loosen set screw in expression control lever arm and detach arm from preamplifier g Remove preamplifier from shelf after tak ing ont mounting screws h Unsolder do not cnt the 79 mannal leads 2 gronnd leads 3 pedal signal leads red orange and yellow and the pedal filter leads brown and black i Atthe power terminal panel unsolder the five wires leading to the mannal chassis start and run motor switches Determine these lea
157. d as Iollows whenever control tube is replaced Set expression pedal wide open both volume tablets normal percussion on percussion decay fast and harmonic selecior ineither position Depress any key in upper half of upper man ual and then adjust cut off control exactly to the point where signal becomes inaudible REVERBERATION CONTROL Reverberation contro is an important feature of Hammond Organ installation This device 18 enjoying wide acceptance because it produces reverberation m var iable degrees the Hammond Organ when installed in an acoustically dead enclosure sounds very much hke an organ played m a large acoustically live church or auditorium where organ music enhanced by considerable reverberation sounds at its beat Reverberation 18 the prolongation of aound by repeated reflections or echoes and 1s measured by the time required for a sound ta become inaudible after the source of sound has been stopped It 1s present in some degrees in all enclosures and music more pleasing to the ear when accompanied by some amount of reverberation This 1 particularly true of organ muaic Reverberation results from the fact that the longer path traveled by reflected sound causes a delay hearmg the reflected sound waves This 18 easily realized in the case of sharp staccato sounds and a fairly distant reflecting eurface ae the delayed sound 1s then heard separately from the direct sound
158. d aud oue for reverberated signal and a bass channel with a cross over point of 200 cycles Each channel has two 6BQ5 output tubes with self bias Each treble channel drives a 12 speaker and the bass channel drives two 15 speakers in parallel 5 56 The power supply unit is a separate chassis housing the power transformer recti fier tubes filter and input connections for power and signal A 6 pin plug engages the console cable and a 5 pin receptacle is pro vided for plugging in additional tone cabinets The console cable consists of 5 conductors 2 for AC power 2 for push pull signal and ground 5 57 The push pull signal from the console G1 and G2 drives treble input tube V1 Re sistance capacitauce filters ahead of V1 filter out signal frequencies bclow 200 cycles V1 drives output tubes V2 and V3 of the treble direct channel It also drives double triode tube V9 which in turn drives the reverbera tion unit 5 58 The output of the reverberation unit passes through transistor TR 1 and part of the signal goes to the treble reverberatiou switch This adjusts the amount of reverberated signal going into V10 which drives output tubes V11 and V12 of the treble reverberation chaunel The switch in its off position picks up signal from input terminal G1 iu order to make use of the channel for non reverberated signal when the treble reverberation is off 5 59 Both treble channel output transformers have tert
159. d to the actual frequencies 3 20 If all notes are nniform in intensity or change evenly from note to note the tone generators are operating normally However if notes are weak or absent proceed as directed in paragraph 3 21 3 21 CORRECTION 3 22 Asingle dead or weak note which occurs on one manual but not on the other may be caused by a fault in the key contacts To correct this fault adjust the bus bar shifters associated with the pedal switch and both manuals as directed in paragraphs 4 9 to 4 13 inclusive 3 23 Asingle weak or dead note occurring at the same point on both mannals may be caused by a defective generator a broken wire or a poorly soldered joint on the terminal strip Test 3 78 the generator for ontput by fastening a short length of wire to the 6th bus bar from the bottom on the preset panel then touch the other end of the wire to each lug on the gener ator terminal strip lf all notes sound the cable wire or soldered Joint is at fault and must be repaired lf no generator output exists either the filter circuit or the magnet pickup coil may be defective or the tone wheel is not rotating 3 24 Figure 3 4 illustrates the position of each filter reactor and capacitor on the generator cover Fasten a short piece of wire to the 6th bus bar from the bottom on the preset panel and test each terminal of the filter Reference paragraph 3 23 lf the filter is at fault replace the defective compo
160. ds by tracing the leads from the switches j Detach pilot lamp bracket by removing two wood screws k Unsolder eight scanner wires from ter minals on back of drawbar base 1 Unsolder brown wire from vibrato line m Tie the disconnected cables to the chassis to prevent damage to the other console com ponents when the mannal chassis is removed n Remove the mannal chassis through the rear of the console Slide the chassis out care fully Because of frame construction the chassis will drop suddenly before it is entirely ont of the console Two men are required to remove the manual chassis from the console o Install a replacement chassis by reversing 5 12 the procedure above See Figure 2 2 for cable connections 80 SWITCHES FOR START AND RUN MOTORS 5 81 The switches for the start and run motors are both mounted on the same metal plate the following replacement instructions are equally applicable to each a Remove the black bakelite switch handle by unscrewing it in a counter clockwise direc tion b Remove the round knurled nut which holds the switch to the metal plate c Remove the four oval head screws which hold the switch plate to the music rack d Remove the rear panel of the console Unsolder the leads from the defective switch at the power terminal panel on the gen erator See figure 2 1 One lead black 15 wired to the start switch Fonr leads 1 yellow 1 black 1 blue and 1 brow
161. e switch is operated while the start switch is held in ON position power is applied to the synchronous run motor and a 250 ohm resistor 1 000 ohm for 234 volts is connected in series with the start motor thus reducing the driving power of the start motor Because of the braking action and the loss of power of the start motor the system slows down to and locks into synchro nous speed the run motor then begins to carry the load When the START switch is released and springs back into position the start motor disengages from the drive shaft by action of a spring assembly and stops 5 13 The spring couplings of the motor shaft the flexible couplings between the sections of the drive shaft and the tone whecl spring con plings are provided to absorb the variations in motor speed The synchronous motor operates with a series of pulsations one each half cycle If the tone wheels were coupled rigidly to the motor this irregularity would carry extra fre quencies into each tone wheel The spring sus pension system for supporting the main tone generator minimizes the transmission of mechan ical vibration between the console cabinet and the main generator 5 14 VIBRATO EQUIPMENT 5 15 The vibrato effect is created by a periodic raising and lowering of pitch and thus is funda 5 3 PINION LUBRICATING WICKS Figure 5 3 Starting Motor mentally different from a tremolo or loudness sections
162. e a 6 pale plug at one end and a pole receptacle at the other It consists of two AC wires two grid signal wires a B plus wire to carry plate current from the first power amplifier to the console preamplifter and a ground signal return conductor which 18 actually a shield over the plus wire This cable 1s especially designed for use with the Hammond Organ and 15 approved by the Underwriters Laboratories for that purpose 5 Conductor console to cabinet or cabinet to cabinet cable This is identical to the 6 conductor cable except that it has no shield and one end has a 5 pole plug instead of a 6 pole plug lt has no B plus conductor the fifth wire being used for ground it 14 used for carrying power and signal between amplifiers since B plus connection 18 never needed beyond the first power amplifier to connect an echo cabinet since this case also plus connection ts required and as a console to cabinet cable for models where the console preamplifier has its own power supply In case 5 conductor bulk cable 15 not available 5 conductor cable assembly may be made from 6 conductor bulk cable using the shielded wire for ground and leaving the shield disconnected NOTE 5 conductor console to cabinet cable ia used with Models B 2 B 3 C 2 C 3 RT 2 RT 3 A 100 amp D 100 3 Conductor cabinet to cabinet cable This is used for carrying only the signal between amplifiers and s used for connecting cabinets wh
163. e achieved if the inetructions below are followed Order two speakers or four epeakers as releted to tone cabinet 014 021270 Remove speaker plugs from amplifier and remove both speakers from tone cabi net Clip all 4 wires from both speakers as close to speaker as possible Discard both speakers Remove wires from pinos 1 and 6 of the 6 pole plug Remove these wires from cable Remove wires from pins 1 and 5 of the 5 pole ping Remove these wires from cable Install 250 ohm 20 watt resistor across pins 1 and 5 of the 5 pole plug Uae sleeving over lead connected to pin 5 Solder 2 remaining wires in each speaker cable to the aew PM speakers Sol der wire with solder lug to the left hand speaker terminal as viewed with the speaker terminal strip facing up Solder wire from speeker plug to right hand terminal Mount oew speakers in cabinet and insert plugs into amplifier Attach leads witb soider lug to upper bindiog post Dress 250 ohm resistor away from any speaker leads or other objects to assure adequate heat dissipation CHASSIS USE SLEEVING ON THIS LEAD NEW SPEAKERS HOOO 000495 11 87 5 PRINTEDINU S
164. e primary of the matching transformer Manual Chassis Assembly Models B 2 C 2 and RT 2 In these selective vibrato consoles the individual manuals are the same in other models but the drawbar assembly is different having three tilting tablets Vibrato Swell On Off Vibrato Great On Off and Volume Soft Normal at the left of the vibrato switch knob The selective vibrato feature requires that ihe preset panel and drawbar assembly be divided and connected to two matching transformers each serving one manual See schematic diagram in Section 2 The Great or lower manual matching transformer also serves the pedal keyboard Continuous contact drawbars are used m later consoles of this type They operate more smoothly and require less accuracy of adjustment than the earlier type havtng mne definite positions or steps Each one has two contacts connected together by one ohm resistor so that at least one of the contacts touches some bus at all times and there are no dead spots the drawbar motion The resistor avoids short circuiting adjacent busbars Manual Chassis Assembly Models B 3 C 3 RT 3 A 100 amp D 100 The above description also apphes to these models but the start and run switches are relocated to provide room for four tilting tablets which control the Percussion feature described in Section 10 manual chassis assem blies are equipped with continuous contact drawbars Manual Chassi
165. econd or third signal to percussion input terminal on the pre amplifier chassis and is amplified by T4 and T5 The percussion input transformer T5 not only provides push pull signal for the control tube V7 but ulso has third winding which feeds signal back to the 2nd or 3rd harmome draw bar through equivalent key circuit resistor RSO and terminal 717 5 50 When a key ts depressed the note first sounds loudly after passing through the control tube V7 transformer T6 a high pass filter and terminal D to the grid of V4 Immediately ca pacitor C3 ia the control tube grid circuit begins to discharge causing the signal to fade away 5 51 This circuit works as follows Terminal K Approximately 25 volts is connected to the 8th harmonic B adjust key drawbar wire which is counected through the adjust key con tact to the manual bus bar Pressing any upper manual key connects this bus bar to a tone gen erator terminal and virtually grounds terminal K through the tone generator filters This vir tually grounds the plate of V6 stops conduc tion isolates the cathode of V6 and thus isolates the grid circuit of control tube V7 The grid then drifts from about 25 volts to about 15 volts at a rate determined by the time re quired for C31 to discharge through R57 and R58 At the completion of this sequence the percussion signal is blocked so that it is uo longer audible 5 52 No further percu
166. een tone cabinets and organist 4 The audience should hear the choir and the organ as balanced cnsemble and the tone cabinets should be so placed that the chorr voices will not be obscured by tbe organ tones 2 1 REVERBERATION Reverberahon is the prolongation or persistence of sound by reflection what we usually mean by echo It is measurable by the interval of time required for the sound to decay to inaudibility after the source of the sound has been stopped It present in a varying degree io all enclosures and most types of music are more pleasing to the ear when accompanied by a certain amount of reverberation It 13 also the most important single factor to be considered in planning an organ installa tion as proper reverberation makes it easier to attain all of the other requirements necessary for a perfect installation In 2 Hammond organ installation the proper amount of reverberation may be se cured in three ways 1 By the successive reftections of the sound by the boundaries of the auditorium 2 By the Bammond Reverberation Control 3 By placing the tone cabinets in a chamber the boundaries of which cause the argan tones to reverberate before reaching the auditorium REVERBERATION IN THE AUDITORIUM The reverberation that results from the successive reflections of sound back and forih by the boundaries of the auditorium itself is most desirable from ihe installa tion engineer s point of view By auditorium we mean
167. en external AC power circuits are employed itis standard 3 conductor ndoor telephone cord and has 5 pole plugs on both ends cable may be made up with a number of plugs along its length in order to connect several cabinets together This wire can be secured from your local electrical Jobber 2 Conductor hne cord This supplies AC power to the console and has a standard attachment plug on one end and a standard attachment receptacle on the other 2 Conductor cabinet power cord This 1s used to furnish AC power to additional power amplifiers when the signal 19 supplied through 3 conductor signal cable It has a standard attachment plug at one end and 6 pole receptacle at the other AM cables with the exception of the 3 conductor may be ordered lengths as shown on current price list with or without connectors attached Figure shows how all connectors are wired For permanent installatione when the cables are to be installed in conduit special Jones fittings manufactured by the Cinch Manufacturing Company are obtainable through your electrical suppher Those recommended for console location are 1 8406 CCE 6 prong socket 1 P406 WP 6 prong plug with wall plate For each tone cabinet location 1 P406 CCE 6 prong plug 1 S406 WP 6 prong socket with wall plate BLOCK Figure lis simplified diagram showing how the console 16 connected to a single tone cabinet or group of cabinets drawing not over
168. equencies 56 to 67 and 47 for frequencies 68 to 91 Itis necessary that a leaser percentage of frequency difference be present in the higher register an order to avoid too rapid undulation The chorus generator assembly like the main generator has a drive shaft with twenty four brass gears Each gear drives a single assembly consisting of two tone wheels The drive gears vary as to the number of teeth and the tone wheels operate at twenty four different speeds This generator has forty eight tone wheels each with a separate mag net and pick up coil Of these tone wheels twenty four are single and twenty four are double see Figure 1 The double tone wheels consist of two discs with different numbers of teeth mounted on one brass hub The single wheels are electrically connected pairs cach being so connected as to have the same effect as one double wheel Figure 2 15 a complete wiring diagram for connections between main and chorus generators and Figure 31s a back view of the chorus generator indicating the frequency number of eacb magnet DRIVE LLL ME WH NOTE NUMBERS SHOWN FILTER TRANSFORMERS ARE FREQUENCY NUMBERS CABLE CONNECTIONS CHORUS CENERATOR Figure 2 e o o e o e 9 00000 00 Chorus GENERA TO
169. er length to connect it to outlet box and mount 6 conductor plug and plug on remaining piece of cable Figure 6 shows connections to plug and receptacle d Follow remaining part of step 6 and follow Steps 7 and 8 Figure 7 shows position in which outlet box should be mounted on console INSTALLING KIT IN MODEL A CONSOLES In this mode the installaiion of the echo ewitch is complicated by the fact that the right hand wooden end block is very thick and has oo flat front surface to accommodate the switch plate Contact the service department of Hammond Organ for further information Electrically the installation ts the same as for the other models 2 47 dO S WAH LON Od NMOHS TASH 137470 40 3441 AAO OL WIO TUIM HIMM 316v NIYA DISA O31NDOA 93105402 28 NO 137100 30 ONILNNOW 4 waad WIAD 5114 37129143285 ONY 3 0d 9 Oi 318 2 JO SNOIL93NNOD 9 33014 ond SO s Ronee 2 48 MONAURAL EARPHONE CONNECTIONS Earphones can be added to the console for practice purposes so as not to disturb others Earphones at b
170. es e 2 28 5 679 9 as ema _ 3 End LNA 35345 303 288 3 48 310143713 8 gla aes 31241434943 29 x Bes 1 595 293 d o 35 a S eden 958 Cag gt 52 Anz 2 AL gt 20 UI Ar a EMI E p Ng 9 ASB acs n N TRS NOlvaiqga3A3N 104110 26 See Bos cu 98 2 ASU 25 1 eoim ASe UNILJ3NNO S QL2 5 9 304 NCO SSS 55 9 3797143718 83144 110 A H3d WHO 00002 Q3unsv3W Jay 34v 35 20 st YILIN 110 Wied AHO 00202 ONY TANVIUNd NOILVHSSNHS ASH S 35Y110A 29 Tv 4 E SEEMED EK 2766 OL 0005 60482 OL 98722 O SE OL 26 NI CASA iid OL 0 19 40 0 o ear vane 1 66191 2 1w H 0 6 191 Suypdnog ALL LELETEI LEC SUTWYOISNVAL Of id LINN M03 37124143234 Anadino
171. es serial number 42636 and above 2 consoles serial number 42675 and above and RT 2 consoles serial number 2381 and above having preamplifiers code D E F G and n B 3 C 3 and RT 3 consoles Because differences in the preamplifier inpul circuits wlll cause irregular response these transformers are not interchangeable with the previous type unless the preamplifier 19 changed at the same time 5 Model M uses a single small core transformer without primary laps Models M 2 and M 3 have two transformers one for each manual each transtormer identical to the revised lower manual type described in paragraph 4 above OPERATION OF MECHANISM ON PRESET KEYS in their basic construction the preset keys are identical to the playing keys Each has a plastic key mounted on a metal channel pivoted in the rear and with 8 guide toward the front to minimize side motion the front edge of each channel of the 9 preset keys and 2 adjust keys two flat springs are attached one 5 8 long of rather stiff material and another approximately 3 4 long of softer material The softer long spring is sand wiched on top of the stiff spring nearest to the key The cancel key has only one heavy spring approximately 1 long When a preset key is depressed the longer soft spring ts forced downward and snaps under a tubular rod which is part of the cradle The cradle is con structed of two tubes approximately 8 long and assembled 3 4 apart One tube
172. es where amplifier is held down with 4 additional screws at corners these screws and 4 tapped plates under neath shelf shnuld be removed and dis carded Connect cabinet ahh as shown in Figure M Ad Q 40 u intended for in verberation ar tone chimber The two treble speakers normally mounted m the unusual onstallioon where i very low cabinets are stacked ur from top 15 otherwise restricted is possible te move there sprakers to holes provided an the front The metal diffusers must 2 40 Q 40 TONE CABINET 40 Watt Output INPUT WATTAGE Equipped with two channel amplifier two 15 speak ers and two l2 speakers serving the bass and treble channels respectively This tone cabinet conjunction with a Hammond tone cabinet with reverberation add the additional power required for larger instal lation at a minimum cost Can also be used alone where sufficlent natural reverberation is evident DIMENSIONS 31 1 2 Wide 37 1 2 High 18 Deep WEIGHT 126 LBS The 4015 electrical similar to the P40 but with utility type cabinet ts only used where appearance is nota consideration such as tone and reverberation chambers The treble speakers are normally mounted in the top In unusual installation where the ceiling 1 very low cabinets are stocked or radiation otherwise restric ted it 12 possible to move these s
173. est cannot replace the tonal quality achieved from the instruments own speakers but do make the organ more available One method of attaching earphones is shown in the sketch below using a reluctance type headset of good quality Inserting the phone plugs silences the speakers in the console Wiring is between the preamplifier terminals marked and the main amplifier input SWITCHCRAFT SF JAX 25 OR 55 STEREO EARPHONE CONNECTIONS A second method of attaching earphones is given below This will provide a stereo effect that is well worth the cost and effort expended Koss or Jensen 4 ohm stereo phones are recommended 1 Turn over 39 chassis and disconnect two black wires from the BN BK speaker terminal inside of the amplifier Leave output transformer lead connected Connect the two wires removed to the center lug of the three lug terminal strip nearest the front of the chassis and solder connections To 45 3 0 48 inpet Terminale Output 2 49 10 11 12 13 Replace amplifier and place a solder lug under the mounting screw nearest the output transformer Remove the brown wire from the BN BK speaker terminal on the AO 39 and solder it to the lug just installed Remove the green wire from the GN speaker terminal on the AO 39 ampli fier and splice on an additional length of wire long enough to reach the ear phone jack and switch which will be mounted on the front o
174. et or adjust key must be depressed before any circuit can be completed Each preset and adjust key has nme contacts exactly like those of the playing keys These keys have a locking and trip mechanism which allows only one key to be in operation at one time The key at the extreme left end of the manual 1s a cancel key with no contacts which releases any preset or adjust key that happens to be depressed Aiso see Page 15 The adjust keys A and B are connected by flexible wires color coded for easy identification to the corresponding nine drawbars The drawbars slide aver nme busses which are connected to taps on the matching transformer These correspond to different intensities of sound as shown by numbers on the drawbars The two left groups of drawbars are associated with the upper manual while the two right groups work m conjunction with the lower manual In each case the adjust key controls the left hand group of drawbars for that manual The preset keys from to A inclusive are wired to flexible leads terminating at the preset panel in the back of the console where the various tone colors set up by connecting each wire to screw terminal corresponding to the desired mtensity of the harmonic These screw terminals are located 9 horizontal bars each representing a certain intensity for all wires attached to that bar The drawbar busses and the preset panel bars are connected in paralle to taps on th
175. f the console Solder a wire to the GN speaker terminal on the AO 39 long enough to reach the earphone jack Solder a wire to the BN BK speaker terminal on the AO 39 long enough to reach the earphone jack Identify the green and black wires on the center speaker that connect to the 35 or 44 amplifier Remove these wires and connect the green wire to the GN speaker terminal and the black wire to the BN BK speaker terminal on the AO 39 amplifier Identify the speaker terminals on the reverberation amplifier AO 35 or AO 44 If a black wire is soldered to the left speaker terminal on the amplifier reverse the speaker leads at the amplifier so that the gray wire is on the left lug and the black wire is on the right lug of the amplifier speaker terminals Remove the blue wire that is connected to the speaker directly above the reverberation amplifier Splice on an additional length of wire long enough to reach the earphone jack Solder a wire to the empty lug on the speaker long enough to reach the ear phone jack Soider a wire to the right speaker terminal long enough to reach the ear phone jack This terminal is grounded inside the AO 35 or 44 chassis Mount all components to the right of the dotted line shown on the diagram in a suitable box and connect as shown Numbers shown under wires identify these leads based on the preceeding steps Mount box containing switch and earphone jack at a convenient point at the fro
176. from the wall in order to pro vide adequate ventilation The location of the tone cabinet in the room is of great acoustic importance Consult Hammond service min for recommendations The cabinet must always be placed at some distance from the console not only for acoustic ressone but also beciuse the magnetic fell from the amplifier may produce hum in the consale circuits af 24 REAR PR the two are very chose together In case of hum make certam that na piere of elec apparatus having strong magnetic feld is close to the console example an electric click or fluorescent light on the coftsole in some cases produce a loud hum in the speakers NOTE Always supply model designs and serial number when writing the factory regarding the console or the tone cabinet This information can be obtained from the nameplates 12763 0 nivea matian Con ne TREBLE neyi nazaten 2059 sar HAMMOND ORGAN COMPANY 4200 W Diversey Ave Chicago 39 liiinois 3 57 LANIGYD 3NOL NI 8350 31 914 SIOYL IA nnd eee ee aun apeiron Uo pia SBOWLIOA WHOS Tw PEN Pua ED
177. g keys except reversed in color Fig 3 These are replaced by twelve numbered buttons on the Model E console When preset key 18 depressed t locks down and 15 released only when another 15 depressed The exception to this 18 the cancel key at the extreme left which only to release any key which may be locked down Only one preset key 18 used at one time If by mistake two are depressed and locked they may be released hy means of the cancel key Each preset key with the exception of the cancel key and the two adjust keys at the extreme right of the group makes available different tone color whicb has been set up on the preset panel lo cated aide the console These tone colors are set up at the factory in FIGURE 3 amp ccordance with a standard design which has been found to best meet the average organist s requirements They may be Changed if desired by removing the back of tbe console and changing the preset panel connections in accordance with instructions on card located near the pre set panel When either adjust key is depressed the orgen spesks with whstever tone color s set up on the harmonic drawbars sssocisted with thst The percussion sffect on Modsis B 3 C 3 RT 3 100 amp D 100 is introduced when the upper msnusi presat key is depressed see percussion siso DRAWBARS Each console has teat sets of harmonic drawbars two for each manual Fig ure
178. generator ehelf near rear 4 Remove two screws passing up through right hand chassis block of lower manual into control panel Remove one screw holding angle bracket to bottom cover of control panel Tilt upper manual upward and slide control panel assembly through opening toward back of console Remove bottom cover of control panel Remove four wood screws holding wood frame work to chassis of control panel Remove knob and loosen nut which holds volume control Tip wood frame up and shde back until rear wooden strip clears tablet identifi cation strip eo 11 Shde pivot rod out tablet assembly and remove tablets 12 Remove four 3 screws holding tablet assembly to chassis of control panel and tilt assembly up Contacts are now visible and can be cleaned by wiping gently with cloth ELECTRICAL PARTS LIST PEDAL SOLO GENERATOR CONDENSERS REFERENCE SYMBOL CAPACITY VOLTAGE TYPE C75 20 mtd 400 Electrolytic 20 300 80 mid 150 gt Electrolytic 30 mfd 50 Used in Generator 30 mid 15 RTA only 1 400 Electrolyte 10131 1 1 0 mid 50 Not Used Generator 20 mfd 350 RTA 6 mfd 200 WIRE WOUND RESISTORS REFERENCE SYMBOL OHMS WATTS PART NUMBER R T Used in Generator um 10 R 106 RTA only 4500 5 626 060741 VARIABLE RESISTOR REFERENCE SYMBOL OHMS R 118 250 TRANSFORMERS REFERENCE SY
179. he coil The voltage is very small and is of known frequency The frequency is predetermined by the number of teeth and the speed of the rota ting tone wheel Larger coils are used with tone wheels of lower frequencies to provide good low frequency output but smaller coils are used with tone wheels of higher frequency to prevent excessive losses 5 7 Copper rings are mounted on certain low frequency coils for the purpose of reducing harmonics The eddy current loss in such a ring is small for the fundamental frequency of the coil but is high for its harmonics As a result the the relative intensities of any harmonics which may be produced by irregularities in the tone wheels are reduced 5 8 The edge of each tone wheel and the tip of each magnet are coated with lacquer to pre vent corrosion for should oxidation set in the change in tooth shape would introduce unde sirable freqnencies 5 9 Filters for eliminating spurious harmonics from the generated simple tones are located on the top of the main tone generator and consist of filter capacitors and reactors See figure 3 4 These capacitors and reactors are tuned units and are called tone generator filters 5 10 The tone generator filters have a single tapped winding This tap is grounded and one side which is connected to the associated coil assembly through a capacitor forms a resonant circuit for the fundamental freqnency of that coil Harmonics are supressed The
180. he organ is installed With the use of the Hammond Reverberation Unit good organ insiallatian should always result the tonal equipment is placed to give even distribution and proper tonal balance REVERBERATION CHAMBERS When it is desired to conceal the organ tone cabinets and there is adequate space available a properly desigeed reverberation chamber may be very elfective in supply ing reverberation for the organ tones In many cases however the space allotted for use reverberation chamber is anything but ideal and often because of structural limitations little can be done to improve the effectiveness of the chamber other than to make minor corrections The following principles of reverberation chamber design are given for guidance in properly evaluating the good and bad characteristics of a given chamber and in making such changes as will improve the effectiveness of the chamber as much ax possible SIZE As the reverberation time increases the size of the chamber increases the chamber should be as large as possible Experience has shown that practically the only ex ceptions to this rule are when the shape of the chamber may be improved by reducing its size or when the tone opening cannot be made large enough an proportion to the size of the chamber For best musical results the chamber should be at least 800 cubic feet in valume The dimensions of the chamber are in most cases idea if they are n ihe ratio of approzim
181. he power amplifier input tubes practically any number of power amplifiere may be connected in parallel The section on cables and plugs shows methods of connecting amplifiere to the console Replacement parts with the exception of condencere and tubes which are standard and may be purchased from a radio supplier should always be ordered from Hammood Organ Company When ordering epecity the type and serial mumber of the console or tone cabinet When makisg tube replacemeot output tubes in the amplifier should be checked for similar plate current readinge If tubee have been in service for 2 con siderable length of time it ie usually advieeble to change all tubee at one time rather than to try to matcb new tubes to the old ones nr 10007 3 35 INPUT CONTROL Filament transformer 60 cy 17830 1 USED ON MODEL CONSOLE T4 Output transfarmer AO 17026 8 Primary 1300 ohne SERIAL 1574 2451 INCL DC Renistance PRE AMPLiTIER ee FIGURE 2 Ril TONE CONTROL 1 MEG AO 20293 23 SERIAL NO 4000 TO 5639 INCL USED ON MODEL A GONSOLE SERIAL 2452 TO 2559 INCL USED ON MODEL B CONSOLE 3 Filament transfermer 115 v 80 AO 17830 t SERIAL NO 5540 TO 5939 INCL Output transtermer AO 17826 Primary 1300 Secondary 15 DC Resistanc TONE CONTROL 1 MEG 20293 2
182. he spring to the short damping tube Here st la reflected m reduced intensity retraces the same path to the crystal and produces third reflected signal about 5 15 second after the direct signal The second reflected s gnal 18 similarly repeated and this process continues over and over giving a series of signals about 2 15 second apart unti the vibration 18 dissipated by fluid friction in the short tube Just above the short damping tube a reflecting attached to the spring causes partial reflection of high frequencies and helps to make the over all response more uniform The damper felt avoids unde sirable transverse vibration of the springs A greater amount of fluid in the short tube will cause increased energy at each reflection and thereby reduce the number of audible reflections Adjusting the level of fluid in this tube therefore changes the reverberation time and simulates enclosures of different 2 39 2 40 REFLECTING PLATE LOCKING LEVER CONNECTOR RIBBON TO AMPLIFIER REVERBERATION UNIT FIG 2 FIG reverberation selector switch in the amplifier circuit following the crystal can be adjusted to pase more or less of the reflected signal in pro portion to the direct signal While this does not actually change the rever beration tume it is a convenient way to change the amount of reverberation instantly Generally therefore
183. he tower manual The pedal switch has nine contacts under each pedal hey One is used for tuning the pedal solo unii the second serves to key the amplifier and make the pedal solo note Sound and the other seven carry harmonics from the main tone wheel generator to the pedal drawbars se in the B and C series consoles 3 21 3 22 WIRING DIAGRAMS In studying the operation of the pedal solo unit refer first to the block diagram figure 1 and second to the more detailed schematic circuit figure 2 2B 2C The schemafic diagram of the console apart from the pedal solo unif is the same for the Mode CV 2 or C 3 console shown in section 2 Actual connections be tween the pedal solo unif and other paris of fhe console are shown in fhe wiring diagram in section 2 The Oscillator The 32 coils which tune the audio frequency oscilfator are shown figure 2 Whea the lowest note 15 played this pedal has tuning contact all 32 coils are connected in series fo form the tuning inductance of the oscillator When any other pedal is depressed its tuning contact sbor s some of these coits making less total inductance and thus tunes the oscillator to the higher pitch associated with that note If two pedals are depressed at the same time only the higher pitched of the two will sound Frequency Dividers Each divider includes three triodes One acts as driver and pulse rectifier supply ing sharp and narrow
184. herefore the various types are not inter changeable Specific pedal wiring of any consols can be determined by obtaining the serial number and referring to Figures 6 to 11 Included in these sketchea are refer ences to Figure 13 wiring chart ONE PEDAL TOP CONTACT SPRINGS 6TH HARMONIC 5 ETN HARMONIC 4TH HARMONIC 9 5TH HARMONIC 2ND HARMONIC 3RD HARMONIC FUNDAMENTAL NOT CONNECTED BOTTOM BUSBAR ARRANGEMENT OF PEDAL CONTACTS MODEL A CONSOLES SERIAL NOS To 2499 MODEL AND BC CONSOLES SERIAL NOS 4000 To 5075 a o eo o M iO8 Figure 6 REEL ONE PEDAL TOP CONTACT SPRINGS 10TH HARMONIC 12TH HARMONIC 6TH HARMOHIC n HARMONIC 2ND HARMONIC RIA 4TH HARMOHIC FUNDAMEHTAL L HARMONIC BOTTOM BUSBAR ARRANGEMENT OF PEDAL COMTACTS ALL OTHER COMSOLES WITH 25 PEDALS Figure 2ND PEDAL DRAWBAR 151 PEDAL DRAWBAR TH A ATH HARMONICS ATH STH HARMONICS ZNO HARMONICS So s TO PEDAL SWITCH FIGURE 8 PEDAL CIRCUITS MODEL A CONSOLES SERIAL NO 1 TO 2499 MODEL AND BC CONSOLES SERIAL NO 4000 TO 5075 FOR PEDAL WIRING SEE FIGURE I3 COLUMNS 1 4 5 6 7 8 9 08 2013 FILTER 10 OHMS YELLOW A IZTH HARMONICS STH BATH HARMONIC ORANGE 2ND 4TH HARMONICS FUNDAMENTAL amp wines TO PEDAL switch 7 FIGURE 9 PEDA
185. hrough the pedal switch wiring and the tone generator wiring does not affect their use for this purpose since the keying circuit impedance high by com parison The busbar for these contacts 15 wired to a terminal on top of the Switch to which the white keying wire from the pedal solo control panel connecta These contacts are wired to the main tone generator tn the usus way in order that they may supply the 12th harmonic in case speciel circumstances make it desirable to omit the pedal solo unit In this case green wire from the pedal resistor panel the manual assembly it will be found wrapped around the pedal switch cable connectad to the busbar terminal on top of the pedal ewitch sce wiring diagram in section 2 The pedaltonee wil then be identical to those on the B and C zeries organe LOWER MANUAL vina PLATE KEYS SYSTEM OUTPUT OF PEDAL SOLO UMT 574 ol FREQUENCY DIBER be DIVIDER CONTROL EREUT 15 FGI BLOCK DIAGRAM OF HAMMOND ORGAN MODEL BCV Bv C CV D Dv 6 RT CONEOLE cae ner ds mv f NA Wee ae 1 TARET TABLET E sss AEYR i Esc r UPPER ws H SECT On OF 2 TRANSONMEA
186. iary windings which supply inverse feedback signal to the cathodes of the output tubes 5 60 A portion of the ontput of transistor TR 1 goes to double triode tube V4 which is counected as a phase splitter to drive the push pull bass channel The output of V4 goes to the bass reverberation switch which is also connected to the input terminals GI and G2 The bass channel receives a large amount of reverberated signal along with some direct sig nal in the position only nou reverberated signal in the positiou and varying mix tures in the intermediate positions 5 61 A filter network following the bass rever beration switch filters out signal frequencies above 200 cycles Following it is a room size switch which can be used to provide better bal ance by reducing the bass volume wheu used in a small room The signal then feeds push pull tubes V5 and V6 which drive the bass output tubes V7 and V8 5 62 REPLACEMENT OF COMPONENTS 5 63 TONE GENERATOR ASSEMBLY 5 64 Remove the four hexagonal head boits and their associated springs and T washers which 5 9 alywixouddy OA Ain 76912 WALA QUY GN0939 26 TW MS E a NT NT v OL BN
187. iled aid in identifying the trouble with a particular part PROBABLE CAUSE OR REMEDIAL ACTION Check the source of supply 117 volt 60 cycle or 234 volt 50 cycie AC power source is re quired Check the power and connecting cables for secure mounting good contact and broken pins Check the power supply voltage in the tone cabinet Check all vacuum tnbes Connect ontput meter across the console pre amplifier output terminals outpnt is ob tained conduct a point to point voltage test on the defective unit Check the signal input to the power amplifier and compare the reading with the console pre amplifier output reading on the output meter These should be identical 1f no output reading is obtained condnct a point to point voltage test on the defective unit Check the power amplifier output If no output reading is obtained conduct a point to point voltage test 2 Loss of Volume All Notes Low voltage source of supply Check the console preamplifier outpnt voltages Check the power amplifier output voltages Check all vacuum tubes Reference paragraph 3 3 Low voltage from power supply Conduct a point to point voltage test and check for defective components 3 Loss of Volume Single Note 3 80 Dust or accumnlation of dirt on contact make adjustment Reference paragraphs 4 9 to 4 13 inclusive Poorly soldered connection or high resistance contact i
188. ined in a large hall The driver unit at the top of figure 2 introduces up and down vibrations into the stirrup directly under t The two enclosed springs under the stirrup hold it in position but permit it to move freely up and down and the spring at the far left balances the pull of the others These three springs are almost entirely immereed in damping fluid they act largely dampers to stabilize the re sponse of the driver and prevent underaired reflectrona A sound wave from the stirrup travels down the open spring at the far right to the crystal pickup where an electrical produced and conducted to the power amplifier This is the first reflected signal delayed about 1 15 second from the part of the original signal which went directly to the power amplifier The same wave from the stirrup also travels down the second spring from the left which enters the short damping tube At the bottom of this spring the wave is reflected back along the spring reduced in intensity by the damping action of the fluid At the stirrup the horlaontal lever transfers the wave to the right hand spring and t goes on to the crystal to produce a second re flected signal about 3 15 second after the direct aignal Very little of the energy of each wave 18 abaorbed by the crystal and the rest reflected back along the spring The fret reflected s gnal traverses the right epring 11 transferred by the lever and goes down t
189. ire 6th Harmonic black drawbar grey wire gt lt 8th Harmonic white drawhar white wire With a screw driver remove the connections already made on the D Upper Manual row of binding posts and scparate the 9 wires from each other Referring to the chart above the brown and red wires are twisted together and connected with the binding post on the level marked O lowest level Next the white and grey wires ere twisted together and inserted under the binding post on the level marked 1 Sumlarly the green wire 1s connected cn level 2 the blue wire on level 3 the violet wire on level 4 the yellow wire on level 5 and the orange wire on level 6 The wire used for the pre set connections is standard push back wire The ansulation 15 loose and should be pushed back to expose the desired length of bare wire Never remove the insulation by skinning with or knife After a connection bas been made push the insulation forward with the fingers as far as it will go Be sure to twist the wires together so that there will be no stray strands connecting one bar with any other bar The hinding posts should be firmly tightened over the wires ta insure good electrical contacts 2963 1 Figurel5 Matching Transformers The matcbing transformer is used to match the low impedance of the generator and key circuits to the high impedance amplifier input It serves aino through on ite p
190. ired PEDAL SWITCH TENSION ADJUSTING NUTS ET 2 SINGLE PUSHER AQJUSTING PEDAL NUTS FIGURE 25 2 22D Ped Switch Assembly Model 2 RT 3 D 100 These models have a 32 note pedal switch assembly and each note has nine contact springs which touch nine busbars Colored wires carry the pedal tones from the busbars to the resistor panel and drawbars as shown in Figure 11 See paragraph on Wiring of Pedal Switch in Pedal Solo Unit section of service manual Pedal Switch Assembly Model Nine busbars are used in the Model E pedal switch assembly Figure 12 illustrates the arrangement of these busbars and the nine contact springs ot atypical pedal key There are 32 pedal keys and four pedal toe pistons These pedal toe pistons which correspond to the preset pistons of the manuals also have nine contact springs touching the same nine busbars and have a locking arrangement by which only one piston remains in operation at one time Frequencies impressed on the busbars when a pedal is played are picked up by the contacts of the pedal piston which is in use and go from there to the preset panel through pistons 1 or 2 or to the drawbars through piston 4 From the coupler Piston 3 the upper seven harmonics connect to busbars in the great manual while the lower two connect to the lower pedal drawbar and permit it to be used with the coupler
191. iring Models 8 2 B 3 C 2 3 RT 2 3 100 amp D 100 The key circuit wiring for these models is the same as for previaus consoles above serial number 17075 and so columns and E in figure 4 apply Manual Wiring Model M Series The frequency chart in this section does not spply to these models because they have fewer keys on each manual and have a slightly different arrange ment of harmonics Full details will be found in the service booklets cover ing these models t alts 18158 3 43 2 22 43 BH 53 85 52 42 20 35 m so 5 5 2 n 23 z 5 x ss 55 ss 23 e s a st sa w i az sa 55 as c as m co 1 5 D 15 15 15 a 19 or 18 16 i 35 s 52 m a ae 18 38 d6 35 30 2 49 n i 12 18 oso 5 n sa 3 n ce 21 10 s 45 m 23 s 52 n a3 aa at 5 a s a n s I ires
192. itself prodnce the reverberation effect SECTION T ACOUSTICS THE PART THEY PLAY IN HAMMOND ORGAN INSTALLATIONS INSTALLATIONS IN GENERAL The proper installation of Hammond organ requires the careful observance of four primary rules 1 The organ should furnish AMPLE POWER 2 The sound from the organ should be EVENLY DISTRIBUTED 3 The console and tone cabinets should be so located in relation ta each other and to the audience choir soloist ete that PROPER TONAL BALANCE 15 accomplished 4 The organ tone should be PROPERLY REVERBERATED The observance of these rules with due considerstion to the partjcutar use for which the instrument 15 required will insure the best possible installation any type of enclosure These rules wil be discussed in detail in the following pages POWER There are so many factors which have a bearing on the amount of power sound energy necessary ior best musica results in a given enclosure that an accurate formula for determining the required power in all cases would be too cumbersome for everyday use Experience has shown that it is very seldom that too many tone cabinets are specified Therefore if there is doubt as ta the sufficiency of tone cabinets for any installation it 18 reasonably safe to double this amount This will greatly improve the musical quality of the tnstrument and eliminate overloading of the speakers Some of the factors which have a bearing on the amoun
193. ke the beat as slow as possibile While it 13 generally not possible to tune exactly to zero beat the accuracy of tuning provided will be found to be sufficient d The orgamst may prefer to have the pedal solo generator tuned slightly sharp to increase the chorus effect between it and the main tone generator To tune it aharp turn the fine tuning switch counterclockwise one step Note Never tune on the lower pitch registers especially the 32 1004 range where the pitch acuity of the ear is insufficient for accurate tuning If the 4 foat stop 15 tuned as directed above all other registers will be in tune because they are locked by the frequency dividers to exact octave intervals b Wiring of Pedal Switch The nine contacts of each pedal key make contact with nine busbare extending the length of the pedal switch assembly One set of contacts and the corresponding busbar used for tuning the pedal solo unit are wired to terminal panel on top of the pedal switch where the tuning coil cable connects The other eight sets of contacts are wired to the main tone generator as indicated in the pedal wiring chart in the section on manuais and pedals although only seven sets are actually used to carry tones from the main generator to the pedal drawbars The contacts of one cet the ons marked 12th harmonic in the wiring chart are ussd contro contacts for keying the pedal solo unit The fact that they are connected to ground t
194. ked before moving the cabinet and the fluid should be removed as instructed on tbe card attached to the tone cabinet The tone generator is lubricated by putting oil into cups inside the console It is recommended that each cup be filled three fourths full 1 tablespoon once year using only the oil recommended for this purpose CABLES Each console is shipped from the factory with cables sufficient for an ordinary installation having a single tone cabinet 16 has 15 foot 2 conductor hne cord for connecting to an AC wall outlet and a 35 foot console to cabinet cable 6 conductor or 5 conductor depending on the console model to connect to the first power amplifier In case the console 15 located an unusually long distance from the tone cabinet additional 6 or 5 conductor cable must be ordered If the console has an echo switch 5 conductor cable of the required length must be ordered separately to connect it to the echo tone cabinet See Echo Organ Wiring the following page For installations having two or more tone cabinets cable suitable in length must be secured to connect between cabinets Each power amplifier has a 6 pole input plug and 5 pole coupling receptacle for connecting additional amphf ters CABLES USED 6 Conductor console to cabinet cable used only on models A B BA BC BCV BV C CV D DV E G RT This 1s used only between these models of consoles and the first power amplifier and ha
195. ls and pedals The same trouble may appear as en irregular sputtering or crackling of single pedal note This effect may also result from an open circuit in the pedal wiring the pedal to main generator cable or the generator wiring since the control circuit is completed through the main genersior All pedals fail to play on one stop tablet If all other tablets play correctly the signal from the oscillator or one frequency divider 18 not reaching the amplifier This may be due to a loose cable plug a broken wire dirty contact on the tablet In the letter case refer to the following section Procedure for Removing Parts The schematic diagram figure 2 indicates which cable wire and quency divider correspond to each tablet Figure 5 identifies the tabiets and electrical components in the control panel All pedals play the wrong pitch or do not play at all one more low pitched Stop tablets One frequency divider not operating correctly in which case all dividers below will also fail A cathode ray oscilloscope connected from ground to the ptate of any divider tube should show a rectangular wave while the plate of any divider driver tube should show a very sharp and narrow negativa pulse If electrolytic capacitor 78 15 open or very low in capacity all the dividers may 1911 to operate E Key thumps or clicks H capacitor 81 is open there will be loud thump each
196. ls carry the duret ugnal from the console A Reverberation Switch be ob tained to turn the reverberation effect on and off from the console Ask any Ham mond dealer for details ROOM SIZE SWITCH The control switch located on the amplifier B in Fig 1 provided wth for adjustmeot of the bass volume to compensate varatons in room sze When used in a small room t should be adjusted to reduce the bas volume for best tonal balance mate settings for rooms wath average fur 40 VOLUME OF ROOM POSITION OF SWITCH ever 16 000 fe fully counterclockwise 3000 15 000 cu ft to countercleckwne 4000 to 8000 cu ft to clockwase 1004 4000 cu fully clockwise MODEL PR 20 VOLUME OF ROOM POSITION OF SWITCH 2000 ft counterclockwise 3000 ft or fesa clockwise LOCATION OF TONE CABINET back of this tone cabanet must be at least 117 from the wall in order to pro vide adequate ventilation The location of the tone cabinet in the room m of great acoustic waportance Consult a Hammond service man for recommendations The cabinet must always be placed at distance from the console not only for acoustic reasons but also because the magnetic field from the may produce hum in the console circuns if PR 40 REAR QR 40 REAR the two are very close together In case of hum make
197. lso has a thirty two tooth wheel which generates a frequency four octaves above the other The four and aixty four tooth wheels go together as do the eight and one hundred twenty eight tooth wheels The twelve sixteen tooth wheels are mounted with seven one hundred ninety two tooth wheels and the five blank wheels In ths last group the high frequency 18 not four octaves above but is four octaves less five semi tones above the lower This arrangement gives total of 91 frequencies that are connected to corresponding terminals on the generator and then to the manuals and pedal switch In all cases as mentioned above the generator must be uged with corresponding manuals and pedal switches and other types of generators cannot be substituted 82 Frequency Generator Model A serial No 2677 2711 Model D serial No 3144 17 074 Model B serial No 10 550 17 074 Model serial 8664 8739 Model C serial 1248 17 074 Model G serial 4101 7349 Player consoles serial No 9210 only In the above consoles frequencies 1 to 9 have been omitted from the generator and only 82 generator terminals are used Similarly there are only 82 tone wheels and magnets in the generator instead of 91 Blank wheels replace the mne two tooth tone wheels formerly nsed to produce frequencies 1109 This generator change accompanies wiring revision in the manual and pedal switches which makes the frequencies from 1 to 9 unnecessary Gene
198. lt pad used on each manual key or bass pedal to absorb the striking sound Check for intermittent resistors or capacitors by lightly tapping suspected components Check the suspension of the reverberation spring system assembly Adjust the bus bar shifters Reference para graphs 4 9 to 4 13 inclusive 7 Miscellaneous Howl or unwanted sustaining of tone Check reverberation unit locking lever Refer ence paragraph 2 6 b Bass pedals release sluggishly Check and increase tension of leaf springs at end of bass pedals c Preset keys fail to release properly Replace leaf bracket and associated leaf spring replace key if necessary Reference paragraphs 5 73 to 5 75 inclusive and sce figure 1 6 3 81 Technical Bulletin VIBRATO Although this technical bulletin is based on scanner repair it is not the single source of vibrsto problems Check existing switches vibrsto pre amp tubes etc phase shift line box and cables both to and from the scanner Vibrato Switch 18 Seplace Switch Vibrsto pra asp Tubes atc b Replace tubes or other dafective Open Signal Wire Liea bra Repiaca vires or repair Open Prom Scanner ehialded cable amp coonsctions 2 Choppy Vibrato 2 Shorted capacitors on lina box 2a Seplace defective amp b poneota b Open colla on Lina box c 011 saturated bakelite insulat
199. m i i manaa in 99 od E2 dev NIN T 2988588 Jo POD MN Se T PP OV Ut puno oq 7 TI sjuouoduroo 304 Vr GEJ og 7 ox a agize o 93149345 SIND 4O ONY sMOiSIS3N TY 33430 Swng 00002 v 20 WALA gt v 11 1105 3 65 NYONO ONOWWYH 30 DUIA3HOS 0300Y 0705 Wadd ing P am SHL ISN O0 99 14 S300 CNOWW VH Wold cuvusna 32 AIS 40 MOLIS A vo4 RE Wunaweies 30 40 MAI 60069 06060 pum G E ues quet pr Mh m j 2 I LM 2 i n 26012 Sa dion e in CHAISE 4 A gt
200. n are wired to the run switch See figure 4 1 Unscrew or un solder jumper wire between switches f Remove the tape which secures the wires together Unbraid the wires connected to the defective switch up to the manual chassis so that the switch can be removed g Pull out the switch Note the position of the switch with respect to the color of the wires so that the replacement switch will be installed in the correct position h Install the new switch in the proper posi tion Braid and tape the wires carefully so that they will not interfere with the operation of the generator run motor i Solder the leads of the replacement switch to the power terminal panel Operate the switch to determine that it has been installed properly k Repiace the rear panel 5 82 START MOTOR See figure 5 3 5 83 Replacement of the start motor will be accomplished as follows a To make the start motor accessible follow the procedure for removing the main tone gen erator Reference paragraph 5 63 b Remove start motor capillary threads from oiling trough Disconnect the leads to the start motor at the power terminal panel on the generator d Using a socket wrench remove the two start motor mounting screws e Secnre a replacement start motor in posi tion by reversing the procednres above 5 84 RUN MOTOR AND VIBRATO SCANNER ASSEMBLY See figure 2 1 5 85 Replacement of run motor and vibrato scanner assembly will
201. n console wiring Trace the signal in tensity thronghout the circuit by means of high impedance headset circuit to ground As an alternative method attach one end of an insulated test lead 48 inches long to 6th bus bar from bottom on preset panel and use other lead end to trace the signal intensity thronghont the manual wiring 4 Poor Quality ES Use low volume and check the console amplifier output with high impedance headset Check all vacuum tubes Make a point to point voltage test Reference paragraph 3 4 Check individual components for defects espec ially audio bypass capacitors and frequency filters Be sure that the voice coils are not rubbing against pole pieces Check all connecting plugs for loose connections Check wiring connections in cable plugs Check for defective filter capacitors in power amplifier Check all vacuum tubes Replace if necessary Remove all inductive electric or electronic equipment in the vicinity of the console cabinet Check all bypass capacitors particularly on cathode to ground circuits Check ground connection from generator to two halves of lowest preset panel bar 6 Rattle or Intermittent Operations Loose connections between cable connectors Loose cable connections in connector plugs Damaged speaker cone Voice coil rubbing on pole piece Defective vacuum tube Check lubrication Check the individual fe
202. ncrator This section describes the main generator illustrated below Figure 1 The main generator assembly consists of the generatar proper a shaded pole induction motor for starting a non self starting eynchronous motor for driving the umt after s started and either tremulant switch mechanism a Vinrato Scanner mounted on the synchronous motor The entire assembly 15 mounted on two long steel angles which also provide the means of mounting the tone generator in the console The method of mounting 15 such as to minimize the transmission of vibration from the tone generator to the console A drive shaft reeihently coupled to the synchronous running motor extends the entire length of the generator Twenty four driving gears two each of twelve 81268 are mounted on this shaft and the drive shaft itself is divided into several sections connected by flexible couplings The starting motor 18 mounted at the end of this drive shaft opposite the synchronous motor Section 7 describes the starting procedure The main generator proper 1 a long structure in which are mounted 48 rotating assemblies each consisting of a shaft and two discs known tone or phonic whecle There assemblies are coupled resiliently to the drive shaft Each of the driving gears engages two bakelite gears associated with opposite rotating assemblies See Figure 2 These bakelite gears rotate freely on the shafts with the tone wheels and
203. nd higher temperatures will lengthen but no adjust ment for this effect 1s necessary unless the temperature 18 consistently beiow 509 F or above 95 F The reverberation selector switches set at when leaving the factory and should be readjusted on installation to give the most desirable reverberation effect If there s any uncertainty as to the proper adjust ment it 18 generally preferable to allow too much reverberation rather than too littie OPERATIONAL ADJUSTMENTS OF FLUID TYPE It 18 well known acoustical phenomenon that audibihty of some frequencies is emphasized over others m any given enciosure Range of frequencies af fected depends upon the size and type of reflecting surfaces such as walls and ceilings Thus if a musical instrument euch an organ s played n an enclosure of almost any size eome frequencies will sound louder in one portion of the listener area than another and conversely some frequencies will sound weak This can be effectively demonstrated by playing the organ 1n small room with a microphone then listening to the sagnai picked up by the microphone in another room Variations ioudness will be etartling especially when angle frequencies are sounded The reverberation unit similarly produces a response pattern which tends to emphasize some frequencies over others to shght degree This is an operating phenomenon of the equipment and cannot be elaminated This room pat
204. nd the rest across a resistor in series with the line As the vibrato effect is applied to the part of the signal appearing across the line but not to the part appearing across the resistor the combination produces a chorus effect For nor mal vibrato this resistor is short circuited In the Model C 3 console the vibrato effect be applied to either manual separately or to both at once 5 24 Figure 5 5 shows the vibrato line box Each of the inductance coils is connected with one or more capacitors to form one filter section 5 25 Figure 5 7 shows the construction of the vibrato switch 5 26 The scanner shown in figure 5 6 is mounted on the main generator synchronous motor and driven at 412 revolutions per minute is a multi pole variable capacitor with 16 sets of stationary plates and a rotor whose plates mesh with the stationary ones In figure 5 7 Index B two sets of plates have been removed to show the rotor 5 27 Signals coming from the line through the vibrato switch appear on the stationary plates and are picked up one at a time by the rotor Connection to the rotor is made by carbon brushes as shown in figure 5 6 Index A Two brushes touch the sides of the contact pin and a third presses on the end in order to eliminate the possibility of contact failure 5 28 Figure 5 8 shows the vibrato circuit 5 29 The vibrato switch has no OFF posi tion and 3 vibrato chorus positions C1 C2 and
205. nels the first part of the line 13 used for 1 vibrato The vibrato switch has no off position and three vibrato chorus positions C2 and are included it as well as the three vibrato positions V1 V2 and V3 The vibrato effect is turned on and off for each manual separately by means of vibrato swell and vibrato great tablets on the manual assembly The preamplifier used with this clreuit as Isdicaled in Figure 9 of sectlon 2 has two separate channels into which signals from the vibrato great and vibrato swell tablets are fed The vibrato signal goes through pre liminary amplifier through the vibrato system and then into additional stages of amplification The no vibrato signal also has a preliminary amphfier but by passes the vibrato system and goes directly into the foliowing amplifier stages The preamplifier alone is shown in Figures 20 and 20 of section 11 Line with Resistor Dividers The vibrato box of Figure 8 employs resistors for voltage dividers at the compensated pick off points instead of condensers Otherwise this circuit 15 identical with that of Figure 7 The line boxes of these two types are inter changeable and the scanners and switches are identical Coupled Line Figure 9 shows the coupied coli type of vibrato line box It is smaller in size and requires only 18 sections to give the same amount vibrato effect as the 25 sections previously used
206. nent as described in para graphs 5 86 and 5 87 NUMBERS ON FILTER TRANSFORMERS ARE FREQUENCY NUMBERS DF TRANSFORMERS FILTER TRANSFORMERS SALA STARTING MOTOR END 555555555 M 5 G E NN rrr ana 5925271 x LE EEIE z 0C 38 09 3 45 62 2 amp 67 7 31 24 77 7 34 OUTPUT TERMINAL FREQUENCY NUMBERS Figure 3 4 Location of Filters on Tone Generator 3 25 if there is no signal across the magnet pickup coil terminals even with the coil discon nected either the coil is defective or the associ ated tone wheel is not turning Check the pickup coil by unsoldering its lead and with a short piece of wire connect the lead to the preset panel Reference paragraph 5 6 3 26 When there are two dead notes on each manual determine which frequencies are at fault as described in paragraphs 3 14 to 3 20 inclusive Figure 3 5 illustrates the exact location of the magnet associated with each frequency the dotted lines connecting the frequency num 2 9 9 5 HOLOW NAY o 5 6 49 e bers indicate that they are generated by two tone wheels on the same shaft and in the same compartment It should be noted that with few exceptions tone wheels on the same shaft differ in frequency numbers by 48 On fre quency numbers
207. nt shape from those used in other modele and the generator to manual cable connects directly to the filter transformer terminals For d tails refer to Model or M 2 service book When ordering replacement generators be sure to state model and serial number of consoles as generators are not interchangeable Note Consoles have been made equipped with 115 volt 25 or 50 or 60 cycle and 230 volt 50 cycle generators If the owner 15 contemplating moving to location having a different frequency of current the complete generator must be ehanged Where voltage changes only are encountered step up or step down transformers will be necessary Generator Anchoring When a console 15 set up for operation the anchoring must be loosened so that the generator will float freely on its spring suspension system No damage will result if this is not done but the console will sound noisy and the same 15 true if the anchoring 18 loosened but the console is not level If the console 15 to be moved a long distance the anchoring should be tightened during such moves Several different types of anchoring have been employed and instructions for loosening and tightening the generator in any particular console are given the instruction card contained in the bench which accompained that console WHEELS BAKELITE GEAR BAKELITE GEAR ORIYING GEAR SECTION OF MAIN GENERATOR Figure 2 OUTPUT YERMIMAL M
208. nt of the console PHONO INPUT A microphone or record player pickup may be used through the organ if desired The preamplifier is equipped with a standard phonograph input jack The input impedance is approximately 1 megohm and the circuit requires a maximum in put signal of about 1 2 volt A volume control will have to be installed between the microphone or record player input and the organ inasmuch as the swell control of the organ does not affect this input 2 50 SECTION Ili LIST OF ILLUSTRATIONS AND INDEX UST OF ILLUSTRATION AND INDEX Models BC D amp Winng Diagram Figure 15 Schematic Figure 18 Model 4 100 Schematic Figure 30 Winng Diagram Figure 31 Model EV Winng Dragom Figura 17 Schematic Figure 18 Model 26 Wing Diagem Schematic Models 82 8 2 Winng Diagram Figure 20 Winng Diegrem Figure 204 Schematic Figure 21 Models B 3 amp 3 Winng Diagram Figure 23 Schematic Figure 24 Model 0 100 Schematic Figure 33 Diagem Figure 35 Model E Wiring Qiegrem Shoat 3 Winng Diagrem Sheet 2 Mode E wing Diagrem Figurs 19 5 Schematic amp Figure 18 SEE PAGE Model 82 d Winng Diagram Figure 22 Winng Qiagmm Figure 224 Q Schematic 8 2 2 RT 2 PA
209. nt that is being serviced Note On late model instruments the model and serial numbers are printed on the tag attached to the underside of the organ keyboard All orders should specify the Hammond part numbers of the desired parts All orders should provide a specific description of the desired parts For example Power transformer 15 volt zener diode F through B key module etc THIS SECTION 15 DIVIDED INTO THREE PARTS A B 3 C 3 PR 40 Complete Parts List B Early Models Unique Parts List C Early Tone Cabinets Parts List NOTES 1 Part A contains items common to all models please refer to this list first 2 Assemblies not shown are no longer available 3 Items without part numbers are NLA 4 Parts listing does not insure availability TABLE OF CONTENTS A B 3 C 3 PR 40 PARTS LIST MAJOR ASSEMBLY 1 PARTS MODEL B 3 2 WHEEL GENERATOR G tone BAR SSENBLY 22 5 OW 9 UPPER amp LOWER KEYBOARD ASSEMBLY 5 BREAKDOWN PEDAL KEYBOARD ASSEMBLY e PEDAL SWITCH ASSEMBLY PREAMPLIFIER ASSEMBLY PRESET PANEL ASSEMBLY VIBRATOSLINE SBOR o START RUN SWITCH CONTROL PANEL EXPRESSION PEDAL ASSEMBLY PR 40 TONE CABINET PR 40 POWER SUPPLY ASSEMBLY PR 40 POWER AMPLIFIER ASSEMBLY REVERBERATION UNIT NECKLACE TYPE CABINET PARTS MODEL C 3 C 3 PARTS CALLOUT REAR VIEW e e
210. o note the accompaniment tone on this higher note being masked by the high solo quahty pedal solo unit 15 designed as a part of these consoles and because of mechan limitations it is not adaptable to any other modei NOTE Pedal solo generators of all types have elightly different electrical circuits but are interchangeable in all RT sertes consoles Type RTA was used in all RT and some Model RT 2 consoles Types RTB and RTC were originally ased only in Mode RT 2 Types RTD and RTE have improved components but no change in circuits HOW THE PEOAL SOLO UNIT WORKS notes of the pedal solo unit are controlled by two triode vacuum tube master oscillator circuit operating at audio frequencies from 524 to 3136 cyclea per sec ond corresponding to 1 foot pitch Thus the master oscillator operates over the full pedal keyboard range of 32 notes Each time a pedal is depressed its tuning contact tunes the oscillator to the pitch aseociated with he corresponding key in thia 32 note range The output of the oscillator is fed into 3 series of five cascaded frequency dividera each of winch divides Its input frequency by two and thus produces a note an octave lower than its input frequency The five dividers thereby provide pitchee of one two three four and five ortaves below the pitch of the oecillator In this way whea the oscillator is tuned to some given note each divider produces note in exact octave rel
211. o the same drawbar and conducting the balance of the signal through push pull con trol tubes where its decay characterica are controlled FIGURE 8 The Percussion signal 18 then combined with the signal from the manuale alter the vibrato but before the expression control The control tubes are keyed through the eighth harmome key contacta and busbar Pet 1 18 TONE GENERATOR The main tone generator furmshes 82 or 91 different musical frequencies depending the console model It includes a tone wheel magnet and for each frequency Mounted on top of the generator are tuned filtera to insure purity of the tones PREAMPLIFIER The preamplifier is located the console Several types have been used the various console models Some obtain their plate voltage from the power amplifier through the console to cabinet cable while others have a self contained power supply TONE CABINETS Tone cabinets are made in a number of models differing in size finish and power output The numbers 20 and 40 in the model designations indicate the nominal power output in watts Each tone cabinet includes one or two power amplifiers and two or more speakers Cables of special design are used to connect the console to the tone cabinet or cabinets REVERBERATION CONTROL Tone cabinets having the letter within the model designation are equipped with the Hammond Reverberation Control Tha 18 an electro mechanical device de
212. odels A amp 6 Figure 2 amp 3 6 C 0 Player amp G Figura 4 8 5 337 Modais AV OV amp AT Figure 6 3 38 Model E Figure 7 3 38 Model Figure 8 amp 8 3 38 POWER AMPLIFIER SCHEMATICS PAGE IN TONE CABINETS Models A 20 A 40 8 40 40 Figure 10 340 Models A 20 A 40 B 40 C 40 0 20 08 20 6 0X 20 Figure 11 T Models 0 20 08 20 8 40 ER 20 FR 20 F 40 Figure 12 Models 0 20 F 40 FA 40 Figure 13 Models 08 20 ER 20 FR 40 Figure 14 H 40 HA 40 Figo 15 Models 40 HR 40 Figure 16 REVERR PRE AMPLIFIERS RCHEMATICS Models 08 20 20 Figure 17 Models 08 20 20 FR 40 18 POWER AMPLIFIER SCHEMATIC USED IN TONE CABINETS MOOELS H 40 HA 40 Figure 18 Models 40 HA 40 Figure 196 PAE AMPLIFIER SCHEMATICS Models 6 2 C 2 RT 2 Figure 20 Models 6 2 0 2 2 Figure 204 POWER AMPLIFIERS SCHEMATICS USEO IN TONE CABINETS Model 28 20 Figure 22 Model JA 20 Figura 228 Model 20 228 PRE AMPLIFIERS SCHEMATICS Mode s 8 3 C 3 AT 3 Figure 24 POWER AMPLIFIERS SCHEMATICS USEO TONE CABINETS Models PR 40 08 40 Figure 26 Models PR 20 Figure 28 TOME CASINETS 341 341 3 46 347 347 Models 40 08 40 3 52 Models 29 40 08 40
213. of 20 percent or more TAA ORGAN FONE SYSTEM Figure 3 2 Pedal Switch Assembly and the trouble shooting chart reference para graph 3 28 Before starting an elaborate test procedure make a thorough visual inspection to locate the fault Check for defective wiring drops of solder faulty connections open resis tors and capacitors jammed tone wheels etc 3 3 TUBE TESTING When the trouble is traced to a specific stage test tubes in that stage If tubes are satisfactory make a point to point voltage check in accordance with paragraph 3 4 3 4 VOLTAGE AND RESISTANCE MEA SUREMENTS Make voltage and resistance mea surements on the individual components of the 3 5 RESISTORS Resistors used in Hammond Organs are marked with the standard EIA Electronic Industries Association color code as shown in Table II In this code the body color or first color ring starting from the ont side edge indicates the first digit of the resistor valne The second ring denotes the second digit and the third ring represents the number of zeros after the second digit Thus a resistor marked with brown green and yellow rings that order wonld have a value of 150 000 ohms Gold and silver rings represent percentage toler ance gold indicating 5 percent tolerance and silver indicating 10 percent tolerance Replace 3 69 HOLIMS 14934 sjosuo UFO 2 20419425 aantig
214. ole only the signal circuits and ell cabinets remain eoergized as long the console turned on Figures 1 and 3 show how the main and echo tone cabinets are connected to ihe console and figura 3 echemetic circuit of the echo system ECRO ORGAN KIT The Echo kit includee sll cecessary parts for insiallation in consoles Modele BC CV D DV RT 3 B 3 C 3 C 3 RT 3 and HT 3 with the exception of some early and BC having no outlet box For installing kit in console withowi an outlet box or in Model or E console see spe instructions at the end of thie section 3 conductor cable must be ordered seperetely of suitable length to reach from the console to the echo cabinet in additiion to the desired echo cabinet or cabinels FIGURE BLOCK DIAGRAM OF ECHO ORGAN FIGURE 2 CONNECTIONS OF CONSOLE TO MAIN AND ECHO TONE CABINETS INSTRUCTIONS FOR INSTALLING KIT 1 Disconnect chorus drawbar if console bas chorus generstor from lever console by removing coupling pin Detach vibrato chorus switcb if any by removing knurled nut from front Remove four screws in music rackend blocks and remove entire music rack assembly from console 2 Drill holes for ecko switch in music rack base shown in figure 4 music rack snd other parts Mount echo switch 2 45 2 46 Note Staps 3 and 4 apply onl
215. on taining 9 digits each digit representative of the intensity of the fundamental tone or harmonic as selected on the drawbars or preset panel 4 4 The Hammond Organ has its preset panel arranged to make available to the organist ton alities similar to those ordinarily found in the small church or chapel pipe organ as well as tones for religious services and congregational singing without the use of the adjustable draw bars Table 1V illustrates the approved preset panel arrangement for chapel organs Remove the rear panel of the console examine and check the preset panel to determine that the preset panel corresponds exactly to Table Change the position of any lead by loosening the slotted screw which secnres it in place re moving the lead and then securing it in correct position by means of the slotted screw provided Refer to figure 4 1 4 5 ALIGNMENT OF COIL ASSEMBLIES 4 6 Each magnet and coil for each tone wheel is mounted in the tone generator as a single assembly See figure 5 1 To locate and deter mine which coil assemblies require alignment proceed as follows a Remove the console rear panel b Connect an output voltmeter 1 000 ohms per volt scale across the two terminals marked TABLE IV HAMMOND ORGAN PRESET DATA UPPER MANUAL Equivalent EER Sapp Drawbar Setting Tone Quality Value Preset Keys LOWER MANUAL Equivalent Drawbar Tone Qu ly Cancel
216. onous motor can supply power only et synchronous speed Therefore if for any reason the system feils to reach synchronous speed it will not continue to after the start ing switch is released Failure to start properly is usually due to increased viscosity end mey he overcome an increase in start ing time As the schematic diagram Figure 1 indicates the run switch in its off position shorts out the wirewound resistor attached to the hne panel If the run switch is defective its off position the generetor will not start hecause this resistor will be permanently 1n series with the starting motor Before assuming that there 18 anything amiss with the motors ahort out this resistor and start the generetor the normal manner If the generator operates satisfactorily replace the run switch The run switch on al consoles is two circust switch but types of switches having two different terminal arrangements have heen used ahown in Figure 2 When replecing a switch observe the wiring of the old switch and check the connections of the new switch with an ohmmeter Note that black and hlue are connected in the position and yellow and hrown are connected in the off position metter which type of switch is used SYNCHRONOUS MOTORS CNORUS STARTING MOTORS START SWITCH SWITCH WIRE WOUND RESISTOR 115V LINE 250 OHMS 5 LINE 2 GEN 125 OHMS 230V LI
217. ontact in the PEDAL SOLO tablet or a defective connection in any part of the keying circuit will prevent removal of the cut off bias when a key 1s played If this is the trouble grounding pin 15 of the cable plug will make a pedal note sound The following section procedure for Removing Parts tells how to reach and clean the tablet contacts d Amplifier or oscillator circuit The amplifier circuit is conventional in most respects and voltage measurements will generally serve to identify any trouble Failure of the master oscillator will make the pedal solo unil fail to play and voltage readings will be helpful in this case also Figures 4 4A 4B show the locations of all components and a chart at the end of this section gives their characteristics Toe view OF CHASSIS 6547 6587 657 9 Or One a x L 4 af xt aR BRIE po p CORR eO CUR FRONT VIEW OF CHARS Y N m COR TURING CABLE EECA ABLE M RECEPTACLE FON COMPONENT D sero 9 Se HEMAT TUBE TYPES PARENTHESES ARE USER IN TYPE RTG ATE RE PEDA GENI Pedal solo note does not sound on one pedal with any combination of control teblets The contro contact of ihat pedal is probably dirty and can be cleared by adjusting the pedal busbar shifter as described in the section on manua
218. ontrol Tube Plates Tube 13 term 3 9 50 Control Tube Cathode Same any pedal pressed 3 50 Control Tube Cethode Tube V11 term 8 290 1000 Rectifier Cathode AC VOLTAGES Heater voltage to all tubes except 11 6 RMS Rectifier tube V11 heater voltage 5 RMS V11 term 4 or 6 to 37 280 V RMS AC ripple across 1200 ohm resistors R99 R100 R101 connect 1 4 mfd condenser in series with meter Less than 2 V RMS AC ripple across 5000 ohm resistor R105 connect 1 4 m d condenser 1n series with meter Less than 1 V RMS PRACTICAL SERVICE SUGGESTIONS following suggestions cover possible troubles in the pedal solo unit only Sugges tions for the standard organ system will be found elsewhere in the service manual Any trouble the organ ahead of the matching transformer will not affect the peda solo umt but trouble following the transformer will affect boih systems equally Pedal solo umt does not play First make sure that the tubes are lighted ali con trols are in playing position and the rest of the organ plays normally Several possible causes of trouble are listed below in order of probability Tubes The tubes are all standard radio types and can be tested in the usual way Figure 3 shows their locations in the pedal solo generator 5 Loose cable connector See that the 15 Pole plug and the shielded plug are inserted tightly into the pedal solo generator Keying circuit A dirty c
219. ople will have the effect music volume of an open window area of 4 000 square feet as compared with the volume heard when the enclosure 18 empty offset this absorption a disproportionately greater amount of tone cabinet equipment must be used DISTRIBUTION The sound energy from the organ should be distripuled as evenly as possible throughout the enclosure In order that this may be accomplished is important that the sound be distributed in the auditorium above the listeners and that a large percentage of the sound reaching the listener is by numeroua reflections from ihe walls and ceiling Direct proyection well as direct reflection irom the speakers should not reach the listener Focusing effects of curved surfaces such as barreled ceilings often cause difficulty in sound distribution unless the tone cabinet is so located as to reduce the direct sound energy that reaches these surfaces It must be remembered that although sound Is reflected a manner etm lar to licht the reflecting surface must be large in relation ta the wave length of the sound Therefore reflecting surface of given size wlll reflect sounds above a certain frequency while sounds of lower frequency will be diffracted or spread out To flect fully the lower tones of the organ a reflector thousands of square feet in area is necessary This together with the fact ihat different materials absorb sounds of certain frequencies more than others ex
220. or example if the scanner passes over the line at such a rate that 3 600 electrical degrees are scanned each second there will be a frequency change of 10 cycles 5 20 For the widest vibrato the whole line is scanned from beginning to end in about 1 14 second and this rate of change of phase causes about 1 1 2 percent decrease in frequency Note that the frequency remains constantly 1 1 2 percent low as long as the moving pick up re tards the phese at a constant rate 5 21 Since the pick np sweeps from start to end of the line and then back it increases the frequency by an equal percentage on its return trip the average output frequency remaining equal to the input frequency The exact amount of frequency shift depends not only on the amount of phase shift in the line but also on the scanning rate This rate however is constant because the scanner is driven by the synchro nous running motor of the organ 5 22 The degree of vibrato or amount of fre quency shift may be varied by a switch not shown in figure 5 4 which causes the whole line to be scanned for No 3 wide vibrato about half of it for No 2 and about one third for No 5 23 vibrato chorus effect similar to the effect of 2 or 3 slightly out of tune frequencies mixed together is obtained when the vibrato output signal is mixed with a portion of signal without vibrato For vibrato chorus part of the incoming signal appears across the vibrato line a
221. or if a frequency reg ulator 18 used it may be necessary to hold the start switch slightly longer FIGURE 1 1 13 1 12 THEORY OPERATION The console of the Hammond Organ contains the entire tone producing mechanism which 1s completely electrical in operation Within it are produced all the tones and tone combinations of the organ The electrical waves are made audible as music by one or more tone cabinets containing suitable amplifiers and loud speakers The block diagrams Figures 13 and 14 show the chief components of the instrument Electrical impulses of various frequencies are produced within a unit known as the tone generator containing a number of phonic wheels or tone wheels driven at predetermined speeds by a motor and gear arrangement Each phonic wheel 15 similar to a gear with high and low spots or teeth on its edge As the wheel rotates these teeth pass near a permanent magnet and the resulting variations in the magnetic field induce a voltage a wound the magnet This small voltage when suitably filtered produces one note of the musical scale its pitch or frequency depending on the number of teeth passing the magnet each second A note of the organ played on either manual or the pedal keyboard generally consists of a fundamental pitch and a number of harmonics or muitiples of the fundamental frequency The fundamental and eight harmonics available on each playing key a
222. ors which c Clean Stationary snd rotor pick up impurities end short out the plata and replace insulat amp tationary plates to the assembly icolating tne stationary chasais of plates from the nain chassla d Rotor platas rubbing against the stationary d Check play and height of platas inside scannar rotor gear und shaft easenbly 3 Slow Vibrato Seai frozen bazring on sear and shaft assenbly Check ofiing threads and for proper oiling b Poor tension oo drive springs of tha gear b Seplace and shaft and shaft asaenbly sasesbly 4 Vibrato 4 beariag on gear and shaft assembly 4 Replace sear and shaft assembly 5 Squeaking Sound Tension springs of the carbon brushes nis Heat spring connection positionad causiag tha brushes to with soldering iron and squeaking sound against tha rotor contact pins spring will fall into its proper position b Dry bearings b Check for proper oiling 3 82 PARTS LIST Syn Motor amp Scanner 011 Cup Assembly Oil Felt Felt Retainer Spring Screws 3 Screws 2 Shielded lead and Cover Assembly Brush Lug amp Insulator Assembly End Brush Spring Assembly Brush Assembly Screws 2 Screw 1 Housing Cover Assembly Screw 4 Cable Clip Stationary Plate 16 Rotor Assembly Screws 16 Insulators 16 Insulators 16 Front Plate Assembly Bristol Set Screw 2 Gear H
223. other models to accommodate the two pedal presets Directions for Making Pre Set Panel Connections There are 9 color coded wires threaded through one of the lower holes for each pre set key Above each hole are 9 binding posts arranged m vertical order and above tlie uppermost binding post is name plate specifymg the pre set key associated with the row of wires below The lawest hinding post 1s that of zero strength and corresponds toa harmonic control pushed all the way uppermost binding ost 15 of 8 strength and corresponds to a harmonic control drawn all the way out The bus bar strips for each level are extended to the left where they are marked with their appropnate strength numbers For example suppose the combination 006523411 15 to be set up on the D of the Color Code Explanation upper manual it wil be found helpful especially when setting several combina Each group of 9 wires is color coded as follows tons to use the followmg chart Sub fundamental drawhar brown wire T im Sub 3rd harmonic brown drawbar red wire Manual hiy Brown Red Orange Yellow Green Violet Grey Whne Fundamental white orange wire 0 0 6 5 1 4 1 2nd Harmonic white drawbar yellow wire 8rd Harmonic black drawbar green wire x 7 4th Harmonic white drawbar blue wire zd 5th Harmonie hlack drawbar violet w
224. ousing Assembly Screws 4 Gear amp Shaft Assembly 064 016844 012 002996 066 033247 and 066 033248 066 016821 066 016958 846 040314 066 0168 29 066 016828 816 080720 036 016747 045 021942 999 002032 018 033192 and 018 033193 3 83 2 3 5 6 3 84 SCANNER REMOVAL DISASSEMBLY AND REPAIR PROCEDURE DETACH MOTOR AND SCANNER ASSEMBLY FROM THE GENERATOR ASSEMBLY BY REMOVING Four 4 NUTS FROM THE SYNCHRONOUS MOTOR WHICH ANCHORS THE MOTOR TO THE L BRACKETS OF THE GENERATOR ASSEMBLY REMOVE THE CABLE CONNECTIONS IN THE ORGAN SO MOTOR AND SCANNER ASSEMBLY IS FREE FROM ORGAN NOTE LINE BOX AND OUTPUT CONNECTIONS FOR REASSEMBLY LOCATE OIL CuP B OIL FELT C INSIDE CUP THE OIL FELT MUST BE REMOVED AND THE COTTON THREADS UNWRAPPED FROM THE FELT BEFORE SEPARATING THE SCANNER AND MOTOR REMOVE FELT RETAINER SPRING D AND LIFT UP ON THE FELT TO REMOVE THE THREADS 00 THIS VERY CAREFULLY TO AVOID BREAKING THE COTTON THREADS AFTER REMOVING THE THREADS FROM THE OIL FELT TAKE A PICK OR A PAPER CLIP AND REMOVE THE THREE THREADS FROM THE ONE SIDE OF THE OIL CUP BY PULLING THEM THROUGH THE HOLE IN THE CUP THE THREAD FROM THE OTHER SIDE OF THE CUP NEED NOT BE REMOVED LOCATE SCREWS E WHICH HOLD THE MOTOR AND SSEMBLY TOGETHER REMOVE THE SCREWS ANO PULL THE MOTOR ANO SCANNER ASSEMBLY APART THERE IS A GEAR ON THE END OF THE MOTOR SHAFT AND MUST BE
225. peakers to the holes provided in the front covers must holes DIMENSIONS 31 Wide WEIGHT 119 LBS TONE The metal diffusers in front of the speakers must also be moved and the be attached under the top to close the wooden 36 5 8 High 17 1 4 deep CABINET INSTRUCTIONS MODELS P 40 AND Q 40 be moved with the speakers and wooden covers from front holes should then be used to seal tap holes Additional tone cabinets may be connected ro thus unit using 5 conductor cabinet ti cabinet cable connected to socket marked Additions Power Amplifiera Fig 1 Signal at this comes directly from console total input wattage of all cabmets ex ceeds rating console nameplate aux Ilary power relay must be provided TRERLE AND RASS CHANNELS The amplifier n thia tone cabinet incorpor ates dividing networks so that the two 15 bass speakers respond only to fre quencies below 200 cycles and the two 12 treble speakers cover the range above 200 cycles BASS CORRECTION Bus Correction ewech on used to compensate for variations m roum size When cabinet is used in a small room switch should be adjusted to reduce volume for best tonal balance Approx mate settings for rooms with average furnishings will be az follows M cabinet is placed n a tone cham ber these Ggures apply to of listening room YOLU E ROOM SWITCH POSITION Over 16 000 cubic feet 9 8 000 to 16
226. plains why identical tone colors produced 1n different enclosures will sound very different to the ear BALANCE The placement of console and tone cabinets should be carefully planned so that the following conditions are fulfilled 1 The organ shouid sound loud or slightly louder to the organist at the console than it does to the audience This allows the organist to accurately judge the musi cal effect tu producing and make any necessary corrections before the audience appreciales the need for them It also reduces the tendency of playing too loud which th usualy evident when the organist hears the organ at a lower level than the audience 2 organist should bear the organ and the choir with the same relative loudness that the audience hears them otherwise perfect tonal balance between organ and choir from the organist s point of hearing will result in an unbalanced eHect an heard by the audience When we refer to the choir we also include instrumental groups or soloists who may have occasion to perform tn conjunction with the organ 3 The tonal equipment of the organ should be so located that the chow while stnging has adequate support from the organ when played at accompaniment volume They should not however hear ihe organ so loudly an to have difficulty in singing with it Good tonal balance and ease of performance should result if the average distance between choir and tone cabinets about the same distance as betw
227. produced by a variable resistance driven by the motor of the main tone generator and controlled by variable resistor in shunt When the tremulant control is turned as far as possible to tbe lelt the tremulant is entirely off As t 15 turned to the right clockwise the degree of tremolo gradually increases until 16 reaches maximum at the extreme right position The white dot marker on the knoh indicates at a glance the degree of tremolo present Two tremulant controls are used on the Model E console one for each manual These are controlled by separate levers located on the console The tremulant 16 not incorporated in models having vibrato The vibrato effect 15 created periodic and lowering of pitch and thus 18 fun damentally different from tremolo loud ness variation It is comparable to the effect produced when a violimst moves his finger back and forth on string while playing varying the frequency while maintaining constant volume The vibrato mechanism includes an electrical time delay line which shifts the phase of all tones fed into at rotating scanner mounted on the main tone generator picks up success ive signals from various line sections These signals represent various amounts of phase shift and the combination of signals produces continuous frequency variation FIGURE 7 When the vibrato chorus awitch Fig 7 Models AV and RT
228. purchased For the applicable kit consult our D 2 Price last showing these kits Because of mechanical and electrical considerations the later dry type can not easily be included in earlier model tone cabinets REVERBERATION IN SELF CONTAINED UNITS Self contained models of the Hammond Organ A 100 M 100 L 100 contain somewhat aimilar reverberation umt except the reverberation springs ere taunt and self contained The size of this unit 18 approximately 17 long 4 1 2 high and 1 1 2 wide Reproduction is quite similar to the necklace unit This unit does not require any locking or unlocking in movement All repaira and adjustments on this item must be made at the factory and no repair parts are available ECHO ORGAN EQUIPMENT FOR THE HAMMOND ORGAN echo tone cebinet or group of cabinets may be ussd with any type of Hammond Organ console The echo cabinet ususlly pleced et some distance from the console and from the main cabinet for instance et the opposite end of church An echo switch mounted on the console eoables the organiet to play through the main cabinet elone the echo cabinet alone or both together Any etandard Hammond tone cahinet may be used The echo switch has three positions Whea it set to the left the main tone cabinet or cabinets will sound and wheo set to the right the ecbo cabinet will sound With the switch in the center both main and echo wlll eound simul taneously Ths switch cootr
229. r7 Drawbar8 Drawbar 9 subfund sub 3d fund 24 harm 3dharm 4th harm Sth harm 6th harm 8th harm Note G A 49 G 49 68 6l 73 80 85 89 80 85 50 CH 56 69 62 74 81 86 90 81 86 51 D 51 70 63 75 82 87 91 82 87 52 52 71 64 76 83 88 80 83 88 53 53 72 65 77 84 89 81 84 89 54 54 73 66 78 85 90 82 85 90 55 55 74 67 79 86 91 83 86 91 56 56 75 68 80 87 80 84 87 80 57 Gf 57 76 69 81 88 81 85 88 81 58 A 58 77 70 82 89 82 86 89 82 59 59 78 71 83 90 83 87 90 83 60 60 79 72 84 91 84 88 91 84 e pu oo 3 77 TABLE FREQUENCY NUMBERS ASSIGNED KEYS AND PEDALS Continued Frequency numbers assigned to Pedal harmonics Fund harm G G P 10 11 Af 12 12 13 13 32 14 14 33 15 15 34 16 Df 16 35 17 E 17 36 18 F 18 37 19 F 19 38 20 G 20 39 21 G 21 40 22 22 41 23 23 42 24 B 24 43 2d harm 22 1 gt 3 gt t a a 4th harm 6th harm 8th harm 10th harm 12th harm 32 39 44 33 40 45 34 41 46 35 42 47 36 43 48 37 44 49 38 45 50 39 46 51 40 47 52 41 48 53 42 49 54 58 61 43 50 55 59 62 44 51 56 60 63 45 52 57 61 64 46 53 58 62 65 47 54 59 63 66 48 55 60 64 67 These frequency numbers assigned arbitrarily for convenience and are not relate
230. rators having but 82 frequencies are easily identified by a blank space on the terminal strip at the left of the ground terminals The first terminal at the left of this space is terminal 10 91 Frequency Generator with Complex Tone Wheels Model BV serial No 17075 29737 Model CV serial No 17075 30287 Model RT serial No 1001 1201 Model B 2 serial No 35000 40303 Model C 2 serial No 35001 40459 Model RT 2 serial No 1300 2150 In the above consoles the original two tooth wheels in the generator have been replaced with twelve two tooth complex tone wheels which supply a funda mental tone that 1s enriched with the odd number harmonics Both manuais and pedal switch are wired differently and are therefore not interchangeable woth earher models 2 11 91 Frequency Generator with complex tone wheels and narrow cover Model B 2 serial No 40304 and above All Models Model 2 serial No 40460 and above 100 B 3 C 3 0 100 Model RT 2 serial No 215 and above This generator has twelve complex tone wheels and 1s identical to the one above except for the generator cover Because the output terminals of this cover are not in order of frequency See Figure 6 this type of generator 15 not interchangeable with the one above Model M Tone Generator The generator used Spinet Models M and 2 has 86 tore wheels and differs from other models several other respects The twelve complex tone wheels are differe
231. re individually controllable by means drawbars and preset keys or buttons By suitable adjustment of these controls the player 18 enabled to vary the tone colors at will The resulting signal passes through the expression or volume control and through the preamplifier where vibrato 1s introduced to the tone cabinet Here reverberation 1s added electrically and a power amplifier feeds the signal into loud speakers DESCRIPTION A Hammond Organ console Fig 2 includes two manuals or keyboards the lower or Great and the upper or Swell aad pedal keyboard of 25 keys The concert models have a 32 key pedalboard and are constructed to specifications Various controls have appeared on different models The eration of these controls 15 covered in the following Paragraphs STARTING THE ORGAN To start the organ hold the start switch Fig 1 in position for approximately eight seconds Still holding it push the run switch to pos ition leaving both switches on for about four seconds release the start switch to return to its normal position the console is very cold or if frequency reg ulator is used it may be necessary to hold the start switch slightly longer FIGURE 1 1 13 1 14 CONCERT MODEL HAMMOND ORGAN THE HOME MODEL HAMMOND ORGAN FIGURE 2 PRESET KEYS At the left end of each manual are twelve keys identical to the playin
232. reptacement parts Non Selective Vibe i Figure 6 use all consoles with in the model designation bas 25 section vibrato line It is wired to minimize the number of compensatad take off pointe that the last part of the line is used for 1 vibrato The vibrato switch has positions for three degrees of vibrata VI V2 and V3 with three off positions between them and there is separate vibrato chorus switch A resistor connected to the off side of the chorus switch serves to maintain constant volume for the two switch positions The switch 1s not intended to be left in its middle position The preamplifier used with this circuit ts actually two separate cascaded amplifiers onone chassis with the vibrato system connected between them The first section drives the vibrato line and the second section amplifies the signal picked up by the scanner The vibrato off contact tn the vibrato switch carries non vibrato signal directly to the second section of the preamplifier The complele schematic circuit of a console of this type is shown in Figure 7 of section 2 and preamplifier in Figure 6 of sectioo 11 2 33 OFF OR CHORUS CONTACT MOVING CONTACTS CONNECT SCANNER FIG 4 VIBRATO SWITCH BOTTOM VIEW WITH COVER REMOVED FIG SCANNER Selective Vibrato Figure 7 used in early selective vibrsto consoles also has a 25 sectlon line To obtain correct phasing of the vibrato and no vibrato chan
233. rimary winding to establish a series of intensity leveis for the drawbars and preset panel The following types of matching transformers have been used In most they are not inierchangeable and console numbers should be furnished when ordering replace mente 1 Large core transformer used in Modets B BA BC D and These were enclosed in two staes of shield cans 84 various times but they are identical otherwise Two transformers of thle type were used in Model E 2 Large core transformer with taps revised Matching transtormere in organs with non selective vibrato Models BV DV and RT are slightly different from earller models in the number of turns to the first three taps 1f a transformer in an earlier organ is replaced by one of the newer type any preset wires on preset panel bars 1 2 and 3 Should be set to the next higher bar tn order to make the combination Sound the same as before For instance comb nation 00 3543 111 with the old type transformer would become 00 4544 222 with the new 3 Smail core transformers used in selective vibrato organs Models B 2 C 2 and RT 2 having preamplifiers code A B and Two transtormere are used in each organ one with large stack for the upper or swell manual one with small stack for the lower or great manual and pedals 4 Revised small core transformers with smaller stack and greater number of turns These are used In B 2 consol
234. rn all solo tablets off Using only the ftrst white drawbar on either manual bold down the second key G key from the top Hold down the highest pedal Loosen the clamping screw on coil 32 and sltde the coil carefully forward back ward until the note 1s in tune as indicated by the oscilloscope wave pattern stand ing shill or moving no more than one cycle two seconds Tighten the clamping Screw 4 Release key and pedal and press adjacent key and pedal Adjust coil 31 in same way Repeat 21 other pedals and coils in chromatic order downward It 15 1mportant to start with the highest pedal and progress downward one pedal at time because the tumng the lower notes 1s dependent upon all of the higher coils Each pedal adds an increment of inductance in series with all coils above it and adjusting any single note will detune all those below it Note From the above you can see that tuning the individual notes is a Jong and tedious process amd must be done with extreme care It should not be undertaken unless you are absolutely certain that the tuning error is great enough to interfere seriously with playing the organ PROCEDURE FOR REMOVING PARTS To remove Control Panel and Clean Contacts 1 Remove four screws holding music rack and it on top of console 2 Remove two hex head manual bolts exposed when music rack is removed 3 Remove two large hex head manual bolts located on underside of
235. rs and condensers are not used below frequency 44 but a length of resistance wire shunts each generator Frequencies 44 to 48 have transformers only while both transformers and condensers are used for frequencies 49 to 91 except the case of Model A consoles numbered below 2179 which do not have condensers for frequencies 49 to 54 inclusive Two condenser values are used 0 255 mid for frequencies 49 to 54 and 0 105 mid for frequencies 55 to 91 The transformers are all different Each transformer is matched to its condenser and any replacements are supplied as matched pairs by the factory There several types of generators in use and the following information will aid the service technician in identifying the console on which work is being performed 91 Frequency Generator Model A serial 2676 Model D serial No 3143 Model serial No 4000 10 549 Model E serial No 8000 8663 Model C serial 1 4247 Player consoles serial 9000 9209 The number of tone wheels the above models 18 91 and 5 blank wheels are used to maintain the balance the rotating units There are twelve wheels with two teeth one ta operate at each of twelve speeds and similarly twelve have four teeth twelve have eight teeth twelve have sixteen twelve have thirty two twelve have sixty four twelve have one hundred and twenty eight and seven have one hundred ninety two An assembly with a two tooth wheel a
236. s Assembly Model E The appearance of the upper or swell manual and the lower or great manual 18 the same as on other models except that numbered pistons are used instead of preset keys These pistons operate in exactly the same manner and produce the same effects as do the preset keys on the other models The internal wiring of the manuals 15 to a large extent the same as in other models but the use of two tremulants requires that the preset panel and drawbar assembly be divided and that two matching transformers be used each manual be ng connected to its own matching transformer Manual Busbar Shifters The precious metal contact surfaces of the key contacts and busbars are nol subject to corrosion and the manuals are sealed to exclude dust as far as possible In spite of these precautions an occasional particle of dust many lodge on a contact and cause the note to be scratchy noisy or silent and for this reason a busbar shifting mechanism 15 provided on each manual to shde the busbars endwise and thus provide a fresh contact surface The busbar shifter for each manual is a slotted stud near the right end of the manual as viewed from the back of the console see rear view of console in Section 2 for location any note becomes scratchy or silent 1t should first be struck 15 2u times a rapid staccaio manner loosen the dirt This will usually dis lodge the particles and clear the note In case this proced
237. s in the amplifier Re place all tubes if necessary b Improper grounding of all plug connections to and from the amplifier c Defective bypass capacitors in the rever beration portion of the amplifier d Locked spring system e Improper mounting of the reverberatiou unit f Presence of undesirable magnetic fields such as motors generators supply transformers and other equipment geueratiug heavy magnetic field patterns 3 12 LOCATING AND CORRECTING DE FECTIVE INDIVIDUAL TONES 3 13 Silent or weak individual tones are usually caused by defects in the circuit ahead of the amplification system Such defects can be traced to the tone generator aud filter circuits key circuits and board connections aud signal wiring between the manual chassis geuerators and pedal switch Trouble occurriug over the full rauge of tones aud present at the input to the console preamplifier usually be traced to a defect in the mixiug transformer or associated circuitry 3 14 LOCATING DEFECTIVE TONES 3 15 Depress preset key ou the upper mauual See figure 1 1 3 16 Pull out the first No 1 brown drawbar only in the first set of drawbars in the left haud group 3 17 Start with the first key C frequency No 13 of the upper manual and strike each higher uote on this manual in succession The last note at the right end of the keyboard is C frequency No 61 Note the frequency numbers of all weak or dead notes
238. s of the vibrato line box Each of the air core inductance coils connected with one or more condensers to form one filter section Figure 4 shows the construction of a typical vibrato switch Some models differ tn wiring and number of contacts but all are similar mechanical arrangement The scanner 5 15 mounted on the main generator synchronous motor and driven at 412 revolutions per minute It is multi pole variable condenser with 16 sets of stationary plates and 2 rotor whose plates mesh with the ones figure 5B two sets of plates have been removed to show rotor Signals coming from the line through the vibrato switch appear on the stationary plates and are picked up one at time by the rotor Connection to the rotor made by carbon brushes as shown figure 5A Two brushes touch the sides of the contact pin and 2 third presses oo the end in order to eliminate the possibility of contact failure PANEL FOLDED OUT SHOW CONNECTOR VIBRATO LINE BOX USED WITH CIRCUITS SHOWN IN FIGURES 6 7 8 FIG 3 VIBRATO LINE BOX USED WITH COACUIT SHOWN FIGURE 9 SCHEMATIC DIAGRAMS Figures 6 7 8 and 9 show four different vibrato circuits which have been used in various models As the components of different types are oot interchangeable it is important that model and serial number be furoighed when ordering
239. s one octave of notes 7 white and 5 black keys and then adjust the bus bar shifters while holding tbe keys down BUS BARS Figure 4 2 Manual Assembly End View RESISTANCE WIRES FROM SWITCH CONTACTS TO TERMINALS PEOAL SWITCH CABLE TO GENERATOR TERMINAL STRIP SWITCH CONTACTS KEY CONTACT SHIFTER Figure 4 3 Pedal Switch Assembly Cover Removed SECTION V NOTE THE FOLLOWING INFORMATION PERTAINS SPECIFICALLY TO THE MODELS B 3 amp C 3 HOWEVER DUE TO THE SIMILARITY OF THE CONSOLE MODELS IN THIS MANUAL MUCH OF THE INFORMATION WILL APPLY TO THEM ALSO STAGE DATA AND FINAL TESTING 5 1 DETAILED THEORY OF OPERATION 5 2 MAIN TONE GENERATOR ASSEMBLY 5 3 The main tone generator assembly consists principally of 48 rotating sub assemblies each subassembly consists of a shaft 2 disks called tone wheels and a bakelite gear and a drive shaft which extends the entire length of the generator This drive shaft is resiliently coupled at one end to a starting motor and at the other end to a synchronous run motor reference paragraph 5 12 and is divided into several sections connected by semi flexible couplings See figure 1 5 A series of 24 driving gears 2 each of 12 sizes is mounted on this shaft 5 4 Twenty four of the 48 rotating subassem blies are mounted on each side of the drive shaft so that each of the driving gears engages 2 bake lite gears associated with opposite rotating sub
240. s provide varous pitch registers and tone colors Tha pedal solo unit is Independent o the electromagnetic tone generator and can be turned off without affecting the remainder of the organ NORMAL SOFT VOLUME CONTROL Models B 2 8 3 2 3 RT 2 RT 3 A 100 0 100 This control Fig 3 18 a tilting tablet which suppiements the action of the expression pedal In soft position it reduces the volume of the whole instrument s particularly useful when playing in a small room or when the orgams wishes to practice without disturbing others CHORUS CONTROL Models D DV E On these models an extra generator known as a chorus generator will be found To use the tones generated by this umt at will one extra black drawbar has been addcd which operates a switch located on the generator The drawbar labeled chorus is located at the right hand end of the con sole Fig When the organ 1 played with the chorus drawbar pushed the position t operates in exactly the same way as though no chorus were included Pulling be drawbar out to the on position instantancously adds the ensemble or effect to whatever 15 being played Actually it adds a series of slightly sharp and slightly flat tones to the true tones produced by the main generator The resulting electrical wave contains a complex series of undulations which enhance the pleasing effect of many tone qualities notably string and full
241. signed to supply reverberation for installations that are accousti cally dead or have insufficient natural reverberation A portion of the musical signal is delayed by passing througb fluid damped coil springs and then combined with the direct signal By adjustment of the amount of delayed signal the reverberation characteristice of large or small enclosures may be simulated tone cahinet having this umt must be handled in accord ance with directions on the instruction card in order to avoid damaging the umt or spilling the fluid ROTOR TREMULANT Tone cahinets having the letter X in their model designation contain a drum rotor mounted above the speakers and driven by a small motor Rotating in the path of sound from the loud speakers it produces the effect of periodic volume and pitch variation in all tones of the organ A switch for controlling its operation can be mounted on the tone cabinet or an additional cable with a switch located at the console may be used When a console having the Hamrnond Vibrato 1s connected to this type cabinet use of tbe rotor trernulant 1 not recornmended POWER AMPLIFIER A 100 twelve watt amplifier is mounted on the lower shelf of the console It receives the signal from the Preamplifier and increases it in power to drive the two speakers A fifty watt three channel amplifier bass with reverberation treble treble with reverberation together with its independent power supply
242. ss to lock rod Never remove tubes from ther sockets without firat turning power at console INSTALLATION Unlock Reverbecaton Unt by imernog screwdriver in slot at end of lock rod A shown in Fig 1 and turning turn clock wise so that alot vertical If cabinet has rear grille an opening as provided m grille allow access to lock rod Cabinet must be level and must not rock Ploor must be firm ta avoxd vibration Connect console to cabinet cable as shown n Fig 1 Additional tone cabinets may be connected to this umt using a S conductor cabinet to cabinet connected to socket warked ADDITIONAL POWER AM PLIPIERS n Pg 1 Sunc at comes directly from console and does noc have reverberation If addtional cabinets are not Type PR or QR inquire of your Hammond dealer or the factory Serv xz Department on of wolating trans former If total input wattage of all cabinets exceeds rating on console name plate auxilary power relay must be pro ded 40 QR 40 TONE CABINET 40 Watt Output INPUT WATTAGE 220 Equipped with two 15 speakera for bass tones and two 12 speakers for the treble tones They provide tbree dimension amplification which creates a beautiful re verberation effect in Stereo These cabinets feature the new and improved Hammond Reverberation control for both basa and treble tones Convenient outside controls make it to change the degree of reverber
243. ssion signal can be heard until all keys of the upper manual are released so that the coutrol tube V7 grids can again drop to 25 volts the rate of this drop is fixed by the time required to charge C31 to 15 volts through R55 and R56 Thus the percussion effect is heard ouly wheu keys are played in a detached manuer that is when all keys are released before pressing the uext one 5 53 REVERBERATION UNIT See figure 1 10 This device simulates musically desirable echoes in a large room An electrical signal from the amplifier is applied to the driver coil in the reverberation unit which converts the electrical signal into a twisting movement of 3 coil springs This motion is transmitted along each spring to a pickup unit where part of it is converted back to electrical en ergy The remaining portion is reflected back to the driver and again back to the pickup after a time interval determiued by the spring length This reflection process continues until the signal level is reduced to about one mil liouth of its signal value so that it is louger audible The springs are different in length and thus there are 3 separate sets of echoes each repeated a number of times Electronic ampli ficatiou circuitry associated with the reverber atiou unit is contained in the power amplifier described below 5 54 POWER AMPLIFIER See figure 5 10 5 55 This is a 3 channel amplifier with 2 treble channels one for non reverberate
244. stat in series with bass compenaating condenser C2 is across the signal line that when reaistance is least the voluma is least Condenser C5 avoida excessive tremolo on the lower basa frequencias It was not originally installed in Model consoles below aerial number 231 ia a blocking condenser and R3 is a grid resistor for the firat preamplifier tuba 2 27 2 28 S O 1 TONINOO NOVIE SNYMI NOIVM HOVE AS EXPRESSION PEDAL RNEOSTAT CONSOLES SERIAL NUMBERED BELOW 2311 HAVE RED TREMULANT SWITCH WIRE CONNECTED TO TERM 7 AND CONDENSER 5 15 OMITTED aWy sua RHEOSTAT BOX CONNECTIONS MODEL CONSOLE NEAVY BLACK WIRES FIGURE 1 FROM CABLE SHIELDS 13 OHM TREMULANT CONTROL ca 25 TREM D swircH 009 MFD R3 14 MEG EXPRESSION PEDAL RHEOSTAT 44 TO 4 FROM MATCHING TRANSFORMER PRE AMPLIFIER CIRCUIT OF RHEOSTAT BOX MODEL A CONSOLE FIGURE 2 IVT 5 H2LYW HOLIAS RED TREM EXPRESSION PEDAL RHEOSTAT vw TOULNOD SNYWA HIL BLACK WIRES FROM CABLE SHIELDS R
245. stator of the volume control and on the SOFT stator through compensating network 5 44 Volume or Swell Control 5 45 The volume control is activated by the swell pedal connected by an appropriate linkage See figure 1 4 The volume control assembly consists of two sets of stator plates similar to those used in the scanner assembly See figure 5 6 A rotor assembly of similar size is moved by the swell pedal and is capable of meshing with either stator or a portion of each The degree of mesh determines the strength of the entire signal 5 46 The signal is further amplified by the second section of V4 and sent to driver tube V3 which in turn drives the 12BH7 output tube 5 47 PERCUSSION SYSTEM See figure 3 3 5 48 The Touch Response percussion feature is controlled by four tilting tablets figure 1 1 It is available only on the upper manual and only when the B adjust key is depressed Percus sion tones are produced by borrowing the sec ond or third harmonic depending on position of the Percussion Harmonie Selector tablet from the corresponding drawbar of the upper manual adjust key group amplitying it returning part of t to the same drawbar and conducting the balance through push pull con trol tubes which when keyed cause the signal to fade away at a pre determined rate 5 49 With the percussion tablet on adjust key pressed and an upper manual playing key pressed the s
246. t may be caused by line voltage variations The PEOAL SOLO ON tablet must be on and other tablets may be either on or off No pedal should be depressed uniess specified The negative lead of the voltmeter is connected to ground except as noted See figure 5 for terminal locations Connect Positive Meter should read Meter Voltmeter lead to _ volts Scale This shows voltage of 290 290 1000 1st Filter Capacitor 210 210 1000 2nd Filter Capacitor 120 120 250 ard Filter Capacitor 20 20 50 Divider Bias Ground neg to 7 27 37 50 Control Tube Bias Supply Tube VI term 3 190 1000 Master Oscillator Ptate 1st section Tube VI term 48 B 5 50 Master Osciilator Cathode 1st aection Tube V2 term 2 230 1000 Master Oscillator Plate 2nd section Tube V2 term 3 3 5 50 Master Oscillator Cathode 2nd section Tube V2 term 5 180 1000 Oscillator Rectifier Plate Tube V2 term 6 2 50 Osciifator Rectifier Cathode Tube V3 term 2 75 250 Oriver Plate Tube V3 term 5 V6 term 3 V8 term 2 amp 5 95 250 Driver Plates Tube V4 V5 V7 V9 V10 term 42 and 5 55 to 75 250 Ouvider Plates Tube V12 term 3 120 250 Preamplifier Plate Tube V12 term 8 4 50 Preamplifier Cathode Tube V13 term 2 and 5 120 250 Control Tube Plates Connect Positive Meter Should Meter This shows yoltmeter Lead to Read volts 5 ___ Voltage of Same any pedal pressed 105 250 C
247. t of reverberated signal is reduced This accomplished by introducing more or leas direct signal into the bass chaunel as the amount of reverbera tion decreased or increased The treble reverberation switch controle the gain of the treble reverberation amplifier channel but if the switch turned to the Reverberation Off position the direct console treble gnal is fed into this channel to provide full treble acoustic output from the cabinets LEVELING TABS PICK UP DRIVER ec T LIMIT CHANNEL TWISTED PAIR SHIELDED LEAD DRIVER INPUT PICK UP OUTPUT LIMIT CHANNEL CLIP 2 44 INSTALLATION OF PR AND QR CABINETS When these tone cabinets are installed the Room Size control on the reaz of the amplifier chassis should be adjusted in accordance with the instruction card in the tone cabinet and the reverberation device should be unlocked Warning Whenever the cabinct 18 moved even one or two feet the rever beration device should be locked Failure to do this may cause or more springs to become unhooked from the driver or pickup assembly Tone cabinets embodying this reverberation unit do not provide a rever berated signal to other tone cabinets If more than one tone cabinet of the type normally embodying this umt used and reverberation 18 desired from all tone cabinets then a reverberation umt must be included in each tone cabinet Kits are available whi
248. t of tone cabinet equipment required in any enclosure are the size and shape of the enclosure placement of tone cabinets amount and location of sound absorbing materials including persons present in the enclosure The use for which the organ 15 desired also has a bearing on requirements for example an organ to be used primarily to support congregational singing would require more tone cabinets than one inat is to be used mainly for accompaniment of soloists or light entertainment The following conditions in an enclosure therefore usually indicate that more than an average installation may be required 1 When the area of the boundartes of the enclosure 15 great in proportion ta the volume of the enclosure Thus an enclosure of irregular shape having numerous alcoves etc would require more tone cabinets than one of cubical shape 2 When the tone cabinets are located a position where considerable sound absorp tion takes place before the music reaches the listener A poorly designed or construct ed organ chamber ts an example 3 When acoustical correction materials are used on walls or when heavy drapes are present and carpets are used for floor covering 4 When seating capacity is bigh for the size of the enclosure For practical purposes an open wtndow is considered an area of 100 percent absorption of sound A single person absorbs about much sound as four square feet of open window Therefore an audience of 1 000 pe
249. t the coil assemblies require alignment proceed as follows a Disconnect the generator assembly only when absolutely necessary Make adjustments from the rear whenever possible Do not remove the cover as this necessitates unsoldering and resoldering 91 leads in addition to realigning all coil assemblies b Refer to figure 3 5 and determine which coil assemblies require alignment Loosen the set screw which holds the coil assembly in position d Compare the intensity of the note associ ated with the aligned coil with the intensity of adjacent notes Tap the coil assembly gently until it moves close enough to the tone wheel to bring the in tensity up to the intensity of the adjacent notes pull coil assembly back if necessary Do not turn magnet during this operation f Tighten the set screw These coil assemblies are locked into posi tion at the factory and seldom require adjustment Do not pull back with a twist ing motion as damage will result GENERATOR OUTPUT VOLTAGES Freq Output Freq Output No V No R Q Freq Output Freq Output V No V N tn e tA Nw 2 2 2 amp il 2 1 1 1 1 2 1 1 3 3 2 2 2 3 4 8 ADJUSTMENT OF PERCUSSION CUT OFF CONTROL This control located in the preamplifier See figure 1 7 should be read jus
250. ted on the main generator operates at 400 R P M and is connected to the Great manual The other switcb operates at 348 R P M and is coonected to the Swell manual Two types of tremulant switches have been supplied namely the cage type and the enclosed type These are mechanically interchangeable bnt replacing the cage type with the encloaed type doea require a alight change in the circuit In the enclosed type the condenaer ahown aa C5 in Figure 4 iacorporated within the metal housing Therefore the C5 located in the rheoatat box is not required and the tremulant ewitch red wire may be attached to terminal 6 7 B RHEOSTAT BOX The rheostat box coataina the expression control rheoatat and other components including some terminals associated with the tremulant system Figurea 1 to show various modela of rbeoatat boxes and their circuits The rheostat is uaed only in consdle models witb tremulaot and with non selective vibrato Tbe rheoatat itself is actually a variable reaistor with no sliding contacta When tbe expression pedal s advanced a bakelite cam movea down opening in auccession a series of 32 contacta tipped with precioua metal The contacta are connected to fixed carbon resistora Reaistor R2 in figurea 2 and 4 forma conatant load on the matching trana former while R4 and C4 aerve to attenuate the bigher frequencies R4 and C4 were not uaed in Model consoles below serial number 1231 The rheo
251. ted whenever control tube V 7 is replaced Set expression pedal wide open both volume tablets to Normal percussion tablet and harmonic selector in either position Play any key in upper half of upper manual hold it down at least 5 seconds and then adjust per cussion cut off control exactly to the point where the signal becomes inaudible 4 9 ADJUSTMENT OF INTERMITTENT OR NON OPERATING KEYS 4 10 Scratchy noisy or silent keys may result from accumulations of dust which lodge in the contacts To correct this condition strike the key 15 to 20 times in a rapid staccato manner to dislodge the dust particles and to clear the contacts BUS BAR SHIFTER 4 11 If this procedure does not dislodge the dust particles adjust the bus bar shifters See figures 1 4 3 2 4 2 and 4 3 Bus bar shifter Jocated behind the mixing transformer adjusts the bns bars associated with the keys of the upper manual bus bar shifter adjusts the bus bars associated with the keys of the lower manual bus bar shifter adjusts the bus bars associated with the pedal keyboard 4 12 Turn the proper bus bar shifter about two turns in either direction This operation permits the key contacts to strike a new position on the bus bar and should free all contacts of accumu lated dust particles 4 13 in extremely stubborn cases the pro cedure above does not dislodge the dust par ticles use a board to depres
252. tern effect has not proved seriousiy objectionable because as described above it stimulates an acoustical effect which 15 present m some degree whenever any musical instrument producing a wide range of frequencies 16 piayed in an enclosure If soma notes on the organ sound excessively loud while others sound weak it may be traceable to the reverberation control system In investigating thia discoanect the reverberation system by turning the switch the re verberation preamplifier or amplifier to the off position lf notes then sound at equal ioudness turn reverberation system on again and make the following adjustments 1 The two pole plug which connected to wire carrying signal to the driving umt at the top of the reverberation unit may be inserted in two positions Reversing this plug by turning it at 90 will xeverse the input signal phase thus changing the response pattern of the reverberation system Reversing this plug will often improve evenness of overall frequency response for a given installation 2 Sometimes evenness of frequency response can be improved by cutting down amplitude of the reverberated signal This 15 ac complished by changing the position of the reverberation switch switch is on move it to and if switch 19 on move it to Exact recommendation on adjustment of this awitch somewhat difficult as the purpose of the reverberation controi 18 to compensate for la
253. the power and filament transformers by comparing their measured voltage with the voltages given in the circuit diagram voltage values are given for a 117 volt or 234 volt AC input If the input volt age varies a corresponding change will be noted 3 7 SECTIONALIZING TROUBLE 3 8 AMPLIFICATION SYSTEM TROUBLES 3 9 Such troubles as loss of volume poor quality excessive hum noisy operation or signal are usually traceable to the amplification system For example if distortion is noted in the lond speakers connect a headset across terminals marked ou the console pre amplifier See figure 1 7 the quality is good on the headset the cause of the distortion will be found in the amplification system following the console preamplifier Should distortion occur at the preamplifier terminals replace all tubes Should distortion in the console preampli fier continue test each preamplifier stage indiv idnally with the headset When the defective stage is located test each capacitor and resistor for deterioration Insert an 0 1 mfd 400 volt DC capacitor in series with the headset to prevent DC volt age from damaging it 3 10 HUM 3 11 Hum in the loud speakers may indicate trouble in the reverberation spring system assembly Reference paragraph 3 28 If a sus tained hum howl is heard starting only wheu alow note is played at high volume check for the following Microphonic tube
254. the wood screws holding iius block After removal of this block the end of the cradle assembiy will be visible Also visible will the stop felt and bracket assembly This a small angular bracket with a small piece of feit riveted to it mounted in a vertical posttion Remove and discard this Install the new assembly that ihe felt pad is above the preset cradle and ihe flat spring 15 below the cradle as shown in Figure 16 Clamp it in the center of the range of adjustment provided the slot Check all preset keys for operation and adjust the position of the new assembly m case any keys do oot operate correctly The new manual preset cradle return spring should be ordered under part number AO 21709 0 Figure 16 2 26 TREMULANT SWITCH AND CONTROL MODELS A BA BC C D G The tremulant sometimea called tremolo is a periodic londness variation or change n intensity which occurs at conatant frequency It funda meotally different from the vibrato effect which ia created by a periodic raising and lowering of pitch In the Hammond Organ the tremulant effect is produced and controled principally by two components tbe tremnlant switch and the tremulant control The tremulant awitch mounted on the aynchronona motor at the extreme left end of the tone generator is in effect a variable resistor with no aliding or rubbing contacts lt consista of an eccentric geared to the motor shaft which advances a
255. these 32 foot tones When 32 foot stop 13 remsfered in concert organ music if will be found that the pedals required wii rarely be lower tha the G pedal in the first octave Therefore do not use the 32 foot pedai stops indiscriminately for ordinary bass purposes where the 16 100 tone is desired The 32 BOURDON Stop produces an effect which 5 mostly as a very low bass undulation when playing low in the first octave of pedals The 32 BOMBARDE is always used in con junchon with other higher pitched stops When piayed by itself in the lower half of the iowest octave of pedals the effect is of such low pitch as to be of use musically MUTE Pressing the mute tablet shunts small coodenser across the signal circuit to reduce the intensity of the frequencies This 15 effective on all the pedal solo stops to make the tones more mellow This tablet connected in series with the keying contacts in the switch turns on and off any solo combination set up on the other tabiets It thus be used as a preset control for the pedal solo unit Yotume Control The volume knob on the control pane je used to balance the pedal eolo tones with the rest of the organ The over all volume of the entire organ including the pedal solo unit is controlled by the expression pedal Control Tube The push pull control tube a double triode ie normally cut off by a large negative bias applied
256. tustes double set of contact springs making eight contacts avail able for each note Eacb note consists of a fundamental and number of harmonics sub harmonics being used The pedal contact springs are connected terminals by resistance wires similar to those used ihe manual assembly and cable connects these terminals through a wiring tube to the proper terminals on the generator terminal strip Four colored wtres carry the pedal tones from the busbars to the pedal draw bars In some models the wires are connected first to resistor panel on the back of the manua sssembly A small choke coil and resistor mounted on the manus assembly are wired to the lower drawbar see Figures 8 9 10 11 and serve to filter out any higher harmonics or transients which might be present the lower pedal frequencles Early consoles used only seven contacts on each pedal see Figure 6 and were wired so that any harmonic would appear on only one pedal drawbar Figures 8 and 9 Later consoles use all eight contacts Figure 7 and employ system for mixing the 16 ft and 8 ft tones Figures 10 and 11 The harmonic arrangement of the contacts is also different 11 these later units Figure 13 a wiring chart for the pedals showing the frequency numbers appearing on each pedal contact The varistions in wiring make the pedal switches match ihe different types of generstors described in the section Covering tone generstore and t
257. udies mortuaries and small churches include a tone cabinet equipped with reverberation control It may also be used to improve the effectiveness of the organ auditormms where considerable natural reverberation 15 present but where Ims natural reverberation is characterized by an objectionable echo orcurring after the organ tones have seemingly ceased The Hammond Reverberation Unit will not ellimi uate an echo or reduce the natural reverberation time but will often make this natural reverberation more pleasing to the ear by filling in that period between the time the organ tones seem to and the echo occurs The Hammond Reverberation Umt will not add to the reverberation time in auditoriums already having excessive natura reverberation As the reverberation unit is connected to the electrical svstem of the organ and provides reverberation at the source of sound rather than after the sound comes from the speakers it 21005 the inslallation engineer to place the tone cabinets for best results in balance and distribution without the necessity of compromise for reverberation considerations The use of this device also eliminates the necessity of costiy reverberation chambers and by allowing the tone cabinets to be so located as to minimize sound energy lasses a saving the amount of necessary power equip ment often effected A further advantage is lhat the reverberation time may be regulated for best musical results after t
258. up retarda the phase at a constant rate Since the pick up sweeps from start to end of the line and then back it in creases the frequency by an equal percentage on its return trip the average output frequency remaining equai to the input frequency The exact amount of frequency shift depends not only on the amount of phase shifl in the line but also on the scanning rate This rate however is constant because the scanner is driven by the syncbronous runnmg motor of the organ The degree of vibrato or amount of frequency shift may be varied by Switch not shown Fig 1 which causes the whole line to be scanned for 3 wide vibrato about half of it ior 2 and about one third for 1 A vibrato chorus effect similar to the effect two or three slightiy out of tune frequencies mixed together is obtained when the vibrato output signal 13 mixed with portion of signal without vibrato For vibrato chorus part of the incoming signal sppears across the vibrato line and the resi across e resistor in series with the line As the vibrato effect is spplied to the part of the signal appearing across the line but not to the part appearing across the resistor the combination produces a chorus effect For normai vibralo ls reeistor is short circutted In selective vibrato consoles the vibrato effect can be applied to either manual separately or to both at once CONSTRUCTION OF COMPONENTS Figures 2 and 3 show different model
259. ure is not effective the busbar shifter for that manual may be adjusted by turning the stud about two turns in either direction It may sometimes be necessary to hold down the offending key while turning the busbar shifter in order to wipe the contact clean Model consoles below number 995 sre not equipped with busbar shifters except in cases where the manual chassis and pedal switch have been rebuilt Full information on this rebuilding may be obtained from the Organ Service Department of the Hammond Organ Company Manual Wiring Models A AV B BA C CV D Figure 4 wiring chart for the playing manuals be helpful in tracing difficulties associated with the generator or manua s playing manuals wired alike from drawbar 2 to drawbar B inclusive but the wiring of drawbars 1 and 9 varies Column shows the wiring of drawbar 1 for consoles above number 17075 column B refers to all consoles having 82 note gen erators and column is the wiring used in all earlier consoles Column shows wiring of drawbar 9 for Model consoles below serial number 2500 and Model BC console below 5078 column E refers to all later consoles These variations in wiring are designed to match the different type of generators described in the section covering tone generators and therefore the various types are not interchangeable Manual W
260. ves the lower 12 speaker and covers the range above 200 cycles The treble direct channel driving the upper 12 speaker also covers the range above 209 cycles REVERBERATION SWITCHES The relave amount of reverheration for the treble and hars chinaels can be lected by two recessed switches located on the side af the cabinet Esch switch has four pustions When both switches are in the OFF postion the reverberation effect is completely climinited and three channels carry the direct signal from the console A Reverheriiun Switch Kit ein be uh tatced t turn the reverberation effect and off from the console Ask mond dealer fot details ROOM SIZE SWITCH The roum ste intral switch located on the amphher D Fig 1 w provided with slot fur adjustment ot the bass volume to compensate for varatons in room When used in small room it should be idjusteu to reduce the bass volume for best tonal balance Appcuxi mate settings tor moms with average fur will be is tallaws MODEL 40 VOLUME OF ROOM POSITION OF SWITCH user 18000 cu fully crunterctochwne BOO 16 wert eec tetalack wae 4000 15 8000 ru neat 1000 te 4000 cu fully lockwae MODEL PR 20 VOLUME Of ROOM POSITION OF SWITCH exer OU uu f 3000 cu ur less LOCATION OF TONE CABINET The back of thi tone cabinet must be at least 114
261. xed by the time required to charge C31 to 25 volts through R55 and R56 3 FOUR PERCUSSION CONTROL TABLETS CUTOFF CONTROL AND THEIR FUNCTIONS The Percussion On Off Tablet when turned does five things ta the signals of the upper manual adjust key drawbars a It disconnects the 2nd harmonic drawbar from its signal wire b it disconnects the 3rd harmonic drawbar from its signal wire c It connects the 2nd or 3rd harmonic drawbar signal wire depending on position of Harmonic Selector Tablet to input of percussion amplifier d It disconnects the 8th harmonic drawbar from its signal wire This wire connected through generator filters to ground when any key is pressed 15 nected to terminal The 8th harmonic signal is not available on the upper 2 37 2 38 manual as long as percussion tablet is e It inserts resistor R1 in series with upper manual matching transformer T2 secondary to reduce upper manual organ signal so that lower manual will musically balance with the combined upper manual organ and percussion signals The Preset Percussion Switch is not part of the control tablet assembly or per cussion on off tablet but functions as an interlock with it It is located under the upper manual B adjust key This switch ineures thai the full upper manual sig nal is restored by shorting out series resistor introduced by the percussion on tablet when any other upper manual
262. y be used separately or in combinations When the left drawbar 18 used emphasis 15 given to the lower harmonics and similarly the higher harmonics are emphasized when the right drawbar is used The pedal draw bars are located between the two sets of manual drawbars PEDAL TOE PISTONS MODEL E CONSOLE Four pedal toe pistons are located to the left of the expression pedals Num bers one and two of these pistons are lpresets The third 18 Great to Pedal coupler which makes the pedale speak with whatever B foot tone 1s aet up on the Great manual The left pedal drawbar may be used with the coupler to add 16 foot tone The fourth maton connects the pedals to the two pedal drawbars Lighted piston indicators are pro vided on the left side of the console just above the Swell manual Each time a toe piston 45 depressed the proper indicator 15 automatically illuminated so the organist always FIGURE knows which toe piston 15 depressed 1 16 PEDAL SOLO UNIT MODELS RT 2 RT 3 D 100 solo unit is incorporated In the concert Models to provide a series of bright pedal solo tones in addition to the usual pedal eccompaniment tones available on other models The peda solo tones generated by a vacuum tube oscillator circuit are controlled a volume contro knob and eight tilting stop tablets located et the right and of the Great manual Fig 5 One tablet turns ell the pedal solo tones on or off and the other
263. y to console models having B in the type designation 3 Disconnect and remove swell peda connecting rod If console has generator it will be necessary to unfasten preamplifier and rheostat box leaving wires connected and remove mounting channel 4 Remove 4 screws from switch cover panel remove key at top of wiring tube nearest to swell pedal raice tube a few inches and hft pedal awitch cover panel Note Step 5 applies only to console models baving D or R in the type designation 5 Remove key at top of wirmg tube and raise tube few inches to permit detaching the outlet box 6 Unfasten outlet box from hase of console open it knock out pro per receptacle bole blank see figure 5 and mount echo receptacle Solder connections as indicated in figure 5 Puli twistad pair of wires up through wiring tobe Reassemble outlet box and attach it to console Replace pedal awitcb cover If it was raised in step 4 Note For consoles not equipped with outiet box see special instructions at end of thia section 7 Replace any other parta previously removed Fasten echo wiring panel on top of iine panel cover and counect all wires as shown in figure 5 8 Check for proper operation 1f it should happen that the echo cabi net sounds with the switch in main position and the main cabinet sounds with the switch in echo position interchange the main and echo cable wires at the echo wiring panel
264. y vagrant harmonice that may be present there are falters consisting of small transformers and condensers associated with certain frequencies The transformers have a aingle tapped winding and this tap 15 grounded one side which ie connected to the corresponding magnet coil through a condenser forms a resonant circuit for the fundamental frequency of that This tends to emphasize the fundamental and supprees harmonics Locations of these transformers are shown Figure 5 and 6 They are also shown in schematics in section 2 These transformers and condensers are mounted on the top of the generator assembly The transformers are mounted at an angle thus minimizing interference between them The cores of the transformers are made of special iron and the number of laminations used 18 adjusted to secure the proper inductance Wires from the magnet coils connect to the transformers and wires from the transformers lead to the terminal strip on the generator This terminal strip carries the output frequencies of the generator which are arbitrarily numbered from 1 to 91 in order of increasing frequency This frequency numbering 18 continued throughout the instrument In some models the frequencies are not an order on the terminal strip and Figures 5 and 6 indicate the arrangement for different models Several terminals at the right end are grounded to the generator frame and serve to ground the manuals and pedals Transforme

Hammond Organ Service Manual - Early Models (A,B,C series, B3

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