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IT12 User manual
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1. Page 12 Connect one end of a 2 length of bare wire to pin 3 SI of VI tube socket Feed the other end through the center ground lug S2 through pin 9 52 and connect to lug 2 NS of terminal strip X Cut two 6 lengths of hookup wire and strip both ends Twist the wires together and connect one wire to pin 3 S2 of tube socket V2 Connect the other wire to pin 4 S2 Connect the other ends to pin 4 NS and 5 NS of socket VI Pictorial 4 2 PICTORIAL 5 Connect one end of a 4 1 2 length of hookup wire to pin 1 SI of V2 Connect the other end to lug 3 NS of filter condenser C7 Connect one lead of a 330 ohm resistor orange orange brown to lug 3 S2 of C7 Connect the other lead to ground lug U S2 Connect one lead of a 10 ohm resistor brown black orange to lug 1 NS of C7 Con nect the other lead to lug 2 NS Strip both ends of a 5 length of hookup wire and connect one end to lug 2 NS of C7 Dress the wire towards the front of the chassis Connect one lead of a 330 K ohm resistor orange orange yellow to pin 2 NS of socket VI Connect the other lead to ground lug W SI Connect one lead of a 47 K ohm resistor yellow violet orange to pin 1 NS of socket VI Connect the other lead to lug 2 NS of C7 Use sleeving on both leads Gag Page 13 Connect one lead of a 68 ohm resistor blue grey orange to pin 6 NS of VI
2. Twist the orange and blue leads together and connect t gt the orange lead to pin 4 52 of sock et VI Connect the blue lead to pin 5 52 This completes the 4 wiring ise Check over connections and make sure that all have been ET soldered Install the 12AX7 VI and the 12 5 V2 tubes Mount the eye tube by sliding the two sheet metal screws into the slots in the chassis and tightening down and then push the tube forward against the panel Install an 8 32 x 1 4 setscrew in each of the two knobs Install the level control and off on switch knobs Position the pointers so they line up with panel markings Install red binding post caps on the speaker and the T post INSTALL FEET AS SHOWN Install black caps on the B and P post a a Slightly spread the open end of the binding posts with alii a phillips screwdriver after the binding post caps have been screwed on Tap the screwdriver lightly This will keep the binding post caps from falling off Install the four rubber feet on the bottom of the cabinet BINDING POST CAP Install the handle using the two 10 sheet metal screws NOTE The blue and white identification label shows the Model Number and Productions Series Number of your kit Refer to these numbers in any communications with the Heath Company this assures you that you will receive the most complete and up to date in
3. HEATH COMPANY PHONE DIRECTORY The following telephone number are direct lines into departments listed Kit order and delivery information 616 982 341 1 Credit 616 982 3561 Replacement part 616 982 3571 Technical assistance R C Audio and electronics organs 616 982 3310 Amateur Radio 616 982 3296 Test Equipment Strobe lights Calculators Clock Weather Instruments 616 982 3315 Television 616 982 3307 Automotive Marine Appliances Security General Products 616 982 3496 YOUR HEATHKIT 90 _ FULL WARRANIY During your first ninety 90 days of ownership Heath Company will replace or repair free of charge as soon as practical any parts which are defective either in materials or workmanship You can obtain parts directly from Heath Company by writing us or telephoning us at 616 982 3571 And we ll pay shipping charges to get those parts to you anywhere in the world We warrant that during the first ninety 90 days of ownership our products when correctly assembled calibrated adjusted and used in accordance with our printed instructions will meet published specifications If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no fault of yours we will service it free upon delivery at your expense to the Heath factory Benton Harbor Michigan or to any Heathkit Electronic Center units of Schlumberger Products Corporation
4. button 63 145 75 2 position rotary switch 1 wafer CABINE T CHASSIS SPE AKER 80 236 2 T0 208 10 e 211 15 20 401 21 2 15 200 150 1 10 203 143 2 70 204 150 15 HARDWARE 208 6 10 250 212 05 250 2 05 250 8 05 250 18 05 250 52 05 250 31 05 250 83 05 250 89 05 250 43 05 252 1 05 252 3 05 252 4 05 252 7 05 252 22 05 253 10 05 253 27 05 254 1 05 254 2 05 254 4 05 259 1 05 25910 438 47 Ali Td 15 481 2 10 Cabinet aluminum Speaker grille Handle 3 1 2 speaker Chassis Front panel Tube mounting bracket Spring clip 2 56 self tapping screw 4 48 x 5 16 RHMS 6 sheet metal screw H 32 RHMS 4 40 x L 4 PHMS 6 32 short RHMS 10 sheet metal screw 6 32 x 3 8 BHMS 8 32 x 1 4 setscrew J 4B nut 6 32 nut 8 32 nut 3 8 control nut Speed nut Nickel control washer 5 32 flat washer 6 lockwasher 8 lockwasher 3 8 control lockwasher Bolder lug Control solder lug Banana plug solderless phone tip Condenser mounting wafer 3 prong PART PRICE DESCRIPTION No Each MISCELLANEOUS 51 31 1 60 Transformer output 04 64 24 4 45 Transformer power 70 10 10 Black nylon sleeve 70 11 10 Red nylon sleeve 73 1 10 3 8 grommet 15 24 10 Line cord strain relief 260 1 15 Alligator clip 261 4 05 Rubber feet 380 40 10 Label 462 187 30 Knob 476 11 90 Probe body for switch 331 6 15 solder 2 00 Manual see front cover
5. and then the condenser lightly jiggled or prodded to determine whether or not a noisy or intermittent condition may be present Noisy volume controls can be detected and of course the same condition holds true for the rotor section of variable condensers Voltage can be applied to the condenser while it is being rotated and any shorting will be quickly evident Of course it will be necessary to disconnect any external circuit wiring connected to the condenser terminals Transformer windings that are faulty will also show up as noise in the signal tracer s speaker The continuity of the winding can be checked and any leakage from winding to frame can quickly be determined Gag Page 21 There is practically no limit to the variety of useful applications afforded by this feature of the signal tracer It is suggested that the service technician further investigate other test procedures where application of a DC voltage to acomponent in conjunction with a high gain amplifier will permit observation of voltage action Panel Connections For additional flexibility of operation the signal tracer panel features five binding posts These binding posts differ slightly from the conventional type in the respect that it is possible to insert a banana plug into the top of each jack They will also accommodate alligator clips spade lugs conventional hook up wire Test leads such as used in the can be used intercha
6. board by bending the lugs on the swithch as shown Pay a Se g PICTORIAL 6 Push one end of a 1 3 4 length of wire through hole C of the terminal board Connect the other end to lug 3 51 of switch S2 Connect one end of a 3 length of wire to lug 2 SI of switch S2 Strip the other end approximately 1 Push one lead of a 001 ceramic disc condenser through hole C of the terminal board and the other lead through hole B Connect the lead closest to the marking bands of the crystal diode to lug 1 of switchS2 SI Caution Crystal diodes can be damaged by excessive heat Use as little heat as possible when soldering Push the other lead of the diode through hole B and twist together with the condenser lead Solder the two leads on the switch side of the board and trim off any excess lead Use an alligator clip to hold wires in board Cut away one inch of the outer insulation of the coaxial cable Double the lead over and pull the center conductor through the side of the braid as shown Strip off 1 4 of the insulation from the center conductor Slip the black probe end over the opposite end of the cable and cut off 2 of the outer insulation Pull the center conductor through the braid strip off 1 4 of the center conductor insulation and feed the wire through hole A in terminal board from the switch side Push the end of the wire through hole C Twist the three wires together and sol
7. for part number 459 2 415 Red probe end 459 3 25 Black probe end The above prices apply only on purchases from the Heath Company where shipment is to a U S A destination Add 10 minimum 25 cents to the price when ordering from Heathkit Electronic Center to cover local sales tax postage and handling Outside the U S A parts and service are available from your local Heathkit source and will reflect additional transportation taxes duties and rales of exchange Gag REPLACEMENT PARTS If you need a replacement part please fill in the Parts Order Form that is furnished and mail it to the Heath Company Or if you write a letter include the e Part number and description as shown in the Parts List e Model number and Series number from the blue and white label e Date of purchase e Nature of the defect Please do not return parts to the factory unless they are requested Parts that are damaged through carelessness or misuse by the kit builder will not be replaced without cost and will not be considered in warranty Parts are also available at the Heathkit Electronic Centers listed in your catalog Be sure to provide the Heath part number Bring in the original part when you request a warranty replacement from a Heathkit Electronic Center NOTE Replacement parts are maintained specifically to repair Heathkit products Parts sales for other reasons will be declined TECHNICAL CONSU
8. is added Unless otherwise indicated all wire used is insulated Wherever there is a possibility of the bare leads on resistors and capacitors shorting to other parts or to chassis the leads should be covered with insulated sleeving This is indicated in the instructions by the phrase use sleeving Bare wire is used where the lead lengths are short and the possibility of short circuits are non existent OSIN CORE SOLDER HAS BEEN SUPPLIED WITH THIS KIT THIS TYPE OF SOLDER MUST BE SED FOR ALL SOLDERING IN THIS KIT ALL GUARANTEES ARE VOIDED AND WE WILL NOT EPAIR OR SERVICE EQUIPMENT IN WHICH ACID CORE SOLDER OR PASTE FLUXES HAVE EEN USED IF ADDITIONAL SOLDER IS NEEDED BE SURE TO PURCHASE ROSIN CORE 60 40 or 50 50 TIN LEAD CONTENT RADIO TYPE SOLDER PROPER SOLDERING PROCEDURE Only a small percentage of Heathkit purchasers find it necessary to return an instrument for factory service Of these by far the largest proportion function improperly due to poor or improper soldering Correct soldering technique is extremely important Good solder joints are essential if the performance engineered into the kit 1s to be fully realized If you are a beginner with no experience in soldering a hall hour s practice with odd lengths of wire and a tube socket will be a worthwhile investment If terminals are bright and clean and wires free of wax frayed insulation and other foreign sub stances no difficulty will be experienced in soldering Crimp
9. metal screws in the eye tube mounting bracket Clip off the prongs of the spring tube holder as indicated in Figure 2 Mount the spring tube holder on the bracket using the short 6 32 screw and a lockwasher and nut ith Prepare the 8 pin wafer tube socket by bend ing the lugs as shown with a pair of long nose pliers Connect one end of a 1 meg resistor brown black green to pin 3 SI Connect the other end to pin 4 NS Prepare the 6 length of 8 wire cable by cutting 3 of the plastic cover off one end and 2 off the other end Pull the black white and yellow wires out of the cable ERE Gp es iocis Figure 2 i qo Sockel eed L GRASP 3 BEND LUG 3 NOW BEND UPPER HALF SLIGHTLY LUG UNTIL OF LUG AS SHOWN IT POINTS 44 3 TO CLEAR DOWN AS 2 s afi PIN SLEEVE SHOWN N FRONT N 0 Page 15 Cut 2 off the red wire and strip both ends of all the wires Connect the blue wire to pin 2 SI of the eye tube Connect the red wire to pin 4 S2 a Connect the green wire to pin 5 SI Connect the orange wire to pin 7 SI BLUE M 1 BROW Connect the brown wire to pin 8 SI i Plug the socket on the 1629 eye tube and push the tube into the spring clip holder PREPARING THE PROBE AND TEST LEADS Mount the RF Audio switch S2 on the terminal
10. obtain consistently perfect con nections For most wiring a 25 to 100 watt iron or the equivalent in a soldering gun is very satisfactory Smaller irons generally will not heat the connections enough to flow the solder smoothly over the joint and are recommended only for light work such as on etched circuit boards etc Keep the iron tip clean and bright A pad of steel wool may be used to wipe the tip occasionally during use Gag Page 7 HOW TO MAKE PROPER SOLDER CONNECTION IN om B PF k JTE Eh r T Se LPT TF SSF SP Take these precautions and use reasonable care assembly of the kit This will insure the wonderful satistachon of having the mstrument operate perfectly the first 115 tumed on COLD SOLDER JOINT PROPER SOLDER COLD SOLDER JOINT CONNECTION INSUFFICIENTLY CONNECTION CONNECTION MOVED HEATED WHILE COOLING IMPORTANT In the step by step procedure the abbreviation NS indicates that the connection should not be soldered as yet for other wires will be added When the last wire is installed the terminal should be soldered and the abbreviation S 1s used to indicate this Note that a number appears after each solder S instruction This number indicates the number of leads connected to the terminal in question For example if the instructions read Connect one lead of a 47 KO resis tor to lug 1 S2 it will be understood that there will be two lea
11. of tube B in order to check the gain of the first stage a The path of the signal can be traced through any suceeding IF stages to the detector During these tests approximate estimation of gain per stage can be made The amount of gain that can be expected in a circuit can best be determined by previous experience in making similar tests In some cases the RF probe causes a slight detuning effect when applied to tuned circuits In these cases advance the probe to the following test point and if a good signal 15 present it would be reasonable to assume that the preceding circuit is functioning properly The same general procedure may be used in checking RF and IF stages in FM and TV circuits Since the actual signal is the prime factor of consideration the signal tracer will detect the presence or absence of said signal regardless of the type of circuit involved Audio Signal Tracing After detection has taken place in the receiver the use of the RF probe is not required and the switch in the probe should be switched to the audio position Here again the same general conditions previously described apply to the use of the indicator tube and the speaker From the detector stage pin 5 and 6 of tube C the signal can be traced through the various coupling circuits through the audio and output stage tube C and E and the output transformer These tests can be made quickly and easily and any circuit fault would be indicated by
12. or through any of our authorized overseas distributors You will receive free consultation on any problem you might encounter in the assembly or use of your Heathkit product Just drop us a line or give us a call Sorry we cannot accept collect calls Our warranty both express and implied does not cover damage caused by use of corrosive solder defective tools incorrect assembly misuse fire customer made modifications flood or acts of God nor does it include re imbursement for customer assembly or set up time The warranty covers only Heath products and is not extended to non Heath allied equipment or components used in conjunction with our products or uses of our products for purposes other than as advertised And if you are dissatisfied with our service warranty or otherwise or our products write directly to our Director of Customer Services Heath Company Benton Harbor Michigan 49022 Telephone 616 982 3524 He ll make certain your problems receive immediate personal attention HEATH COMPANY BENTON HARBOR MI 49022 Prices and specifications subject to change without notice Num risation Pascal Chour 01 2004 et 12 2006 HEATHEIT Page 1 ASSEMBLY AND OPERATION OF THE HEATHKIT VISUAL AURAL SIGNAL TRACER MODEL IT 12 SPECIFICATIONS lover Oy ceiien ce Power Requirements Tube Complement Speaker Probe and Test Leads Dimensions Net Weight Transformer operated 117 volts AC 50 60 cps 25
13. os ee E 5 32 NUT seg s S0L0ER LUG ty 4 32 E 17 Fi PICTORIAL 1 Mount binding post C with a control solder lug under the bushing See Pictorial 1 Mount the speaker switch S4 as shown in Pictorial 1 Use 6 32 screws In like manner mount the noise switch S3 Insert the 3 8 grommet I Connect one lead of a 001 ceramic disc condenser to terminal H NS Connect the other lead to terminal G NS Page 8 Gag Page 9 Mount the output transformer on the speaker so the two black wires are next to the voice coil terminals Use 6 32 hardware FEAT A bed anria GRAL ae 8 32 ui g LOCK WASHER WI Mount the speaker and the speaker grill to the panel Place a spacer washer between speaker and grill At the same time mount ground lug B Use 6 32 hardware Connect one end of a 3 length of bare wire to speaker lug 2 SI Feed the other end thru ground lug B S2 thru terminal lug Cl S2 and wrap around panel ground lug C2 SI Cut one of the black leads of the output transformer to length strip the end and connect to speaker lug 1 NS Connect one end of a 2 length of hookup wire to terminal lug A SI Connect the other end to speaker lug 1 52 This completes the panel assembly and wiring Set aside to be mounted on the chassis later CHASSIS ASSEMBLY NOTE When mounting wafer tube
14. panel using a nickel control washer between i the panel and the 3 8 control nuts Feed the four remaining wires from the out put transformer through the chassis slot behind switch SI Connect the black wire W to lug 1 SI of speaker switch S4 Connect a short length of bare wire be tween lug 2 SI of switch S4 and lug 2 NS to terminal strip X Connect one lead of a 68 K ohm resistor blue grey orange to lug 2 SI of noise switch S3 Connect the other lead to lug 1 NS of terminal strip X i Connect the wire from lug 2 of condenser C7 to lug 1 NS of P switch 53 Ji Connect the wire from pin 6 of V2 to lug 1 S2 of switch S3 Connect the lead from lug 1 ol the oti on switch to panel terminal H NS Connect the green wire from the output translormer to terminal 53 Connect the red transformer lead to terminal F SI Connect the wire from pin 7 of socket V2 to terminal G NS Gag Page 17 Connect the blue transformer wire to terminal G S3 Feed the probe cable through grommet I and connect the inner conductor to lug 1 S3 of terminal strip X Connect the cable shield to lug 2 S4 Twist the green and brown leads from the eye tube es socket and connect the green lead to lug 3 53 of terminal g a strip Q Connect the brown lead to lug 2 S3 FA M uS Connect the red lead to lug 1 53 of conden ser C7
15. sockets be sure to mount each socket from the top of the chassis If by mistake the sockets are mounted so the lugs pass through the chassis they will short to the chassis where they pass through the mounting hole scurt 09475 Mount the 9 pin wafer tube socket VI on the underside Te Ofthe chassis as shown in Pic torial 3 Use 3 48 hardware a bos AA MAU Nolockwash ers are used with 3 48 hardware xli iis meat mu E In like manner mount the 7 pin wafer tube socket V2 as ees oh shown in Pictorial 3 Use 3 48 hardware a ay Mount the C7 condenser mounting wafer on top of the x mem E MI chassis observing ground lug slot location as shown in Uoc E Pictorial 3 Use 6 32 screws lockwashers and nuts i i irap PICTORIAL 2 PICTORIAL 3 Mount the 2 lug terminal strip X Use 6 32 hardware Turn the chassis over and mount the 2 lug terminal strip at L Mount the 2 lug vertical terminal strip T and at the same time mount the 3 lug terminal strip Q Use 6 32 hardware 9 Page 11 Slip the two speed nuts J and over the corners of the rear apron of the chassis Make sure that the flat side of the clip 15 towards the back and the holes in the clips are centered over the holes in the chassis CONTROL NUT S MICHEL WASHER j gt f cR ft zd P
16. the receiver under test has a specific complaint of low volume Since the receiver is in partial operating condition it could be turned on and tuned to a familiar station The volume control should be turned down so that the speaker out put will not interfere with the signal tracer results The flexible ground lead of the probe should be clipped to the B or ground circuit of the receiver If the receiver is tuned to a strong station and the probe connected a signal should be present at the loop antenna the tuning condenser and at the grid pin 7 of tube A When the probe is moved to the plate pin 5 of tube A a substantial increase in signal should be observed Note At radio frequencies the D C voltages used in the IF stages need not be filtered 100 Coupled with this fact the signal at the mixer or converter plate pin 5 1s very weak and requires a high Gag Page 19 M fe Hat FREE PAVE ave 137 eee Tz dii EETECTON 4 gr T NE Pea FAHIRA I i I L 3 IF EE simmar cr eT T i twin 5 SR gain setting of the tracer These combined conditions result in the hearing of a high hum level in the tracer when the probe is connected to the plate On some receivers the hum over rides the signal making it necessary to move the probe to the secondary of the input IF transformer pin 1
17. 0 150 1 Chassis 203 143 2 1 Front panel 204 150 1 Tube mounting bracket Hardware 208 6 1 Spring clip 250 212 4 2 56 self tapping Screw 250 2 E 3 48 x 5 16 RHMS 250 8 2 6 sheet metal screw 250 18 2 8 32 RHMS 250 52 2 4 40 x 1 4 PHMS 250 31 1 6 32 short RHMS 250 83 2 10 sheet metal screw 250 89 6 32 x 3 8 BHMS 250 43 4 8 32 x 1 4 setscrew 252 1 4 4 48 nut 52 3 22 6 32 nut 252 4 2 8 32 nut 252 7 2 3 8 control nut 292 22 2 Speed nut 208 10 2 Nickel control washer 253 27 4 5 32 flat washer 254 1 11 6 lockwasher 254 2 2 8 lockwasher 254 4 1 3 8 control lockwasher 259 1 B Solder lug 258 10 2 Control solder lug 438 47 2 Banana plug 477 3 1 Solderless phone tip 481 2 1 Condenser mounting wafer 3 prong Miscellaneous old 1 Transformer output 00 64 24 1 Transformer power 70 10 1 Black nylon sleeve 70 11 1 Red nylon sleeve 13 1 1 3 8 grommet 15 24 1 Line cord strain relief 260 1 3 Alligator clip 261 4 4 Rubber feet 390 40 1 Label 462 187 2 Knob 476 11 1 Probe body for switch 1 Manual see front cover for part number 459 2 1 Red probe end 459 3 1 Black probe end Solder REPLACEMENT PARTS PRICE LIST Te order a replacement part use the Parts Order Form furnished with this kit If Parts Order Form is not available refer to Replacemenl Paris PART PRICE No Each RESISTORS 1 4 10 1 9 10 1 20 10 1 25 10 1 31 10 1 35 10 1 38 10 1 60 10
18. CONDENSERS 21 140 10 21 27 10 27 20 15 25 05 1 05 inside the rear cover of the Manual DESCRIPTION 330 ohm 1 2 w 1 K ohm 1 2 w 10 K ohm 1 2 w 47 K ohm 1 2 w 330 K ohm 1 2 w 1 megohm 1 2 w 3 3 megohm 1 2 w 68 K ohm 1 2 w JL ceramic condenser O05 ceramic condenser l condenser HSO 150 v 20 25 v 3 lug Lwasl prong cardlenser TUBES DIODES RECTIFIERS Crystal diode silicon diode 12AX tube 1629 tube 12 A5 tube TERMINAL STRIPS SOCKETS BINDING POSTS 56 26 80 57 27 80 411 26 1 30 411 30 2 05 411 111 1 45 15 17 10 75 22 10 421 3 15 441 2 10 431 10 10 431 16 10 431 51 10 434 15 10 434 31 10 434 77 15 100 16 2 10 100 16 18 10 WIRE SLEEVING 89 1 35 340 2 05 341 1 341 2 U5 ft 343 2 344 59 U5 ft 345 1 l0 ft 346 1 347 1 10 ft Insulator bushing Terminal board Binding post base 2 lug termina strip 3 lug terminal strip 2 lug terminal strip 2 lug vertical termina strip T pin wafer tube socket 8 pin octal tube socket 9 pin wafer tube socket with center ground Binding post cap black Binding post cap red AC line cord Length bare wire Length black test lead Length red test lead Length RG58U Coax Length hookup wire Length braid Length 1 16 sleeving Length B wire cable Page 25 PART PRICE DESCRIPTION No Each CONTROLS SWITCHES 10 67 25 1 meg control B0 1 15 SPST slide switch 60 7 20 SPDT slide switch small
19. Connect the other lead to lug 2 of C7 S4 Use sleeving on both leads Connect one lead of a 005 mfd ceramic disc condenser to pin 2 S2 of VI Connect the other lead to pin 6 S2 Feed one lead of a 1 K ohm resistor brown black red through lug 3 52 of the level con trol and wrap around the control solder lug Y NS Connect the other lead to pin 8 SI of VI Connect one lead of a 330 K ohm resistor orange orange yellow to pin 7 NS of VI Wrap the other lead around solder lug Y S2 Connect one lead of a 005 mfd ceramic condenser to pin 7 52 of VI Connect the other lead to lug 2 51 of control RI Connect one lead of a 005 mfd ceramic condenser to lug 1 51 of control RI Connect the other lead to lug 1 NS of terminal strip X Connect one lead of 001 mfd ceramic disc condenser to pin 1 NS of socket VI Connect the other lead to lug 2 NS of terminal strip X Connect one lead of a 01 mfd condenser to pin 1 53 of tube socket VI Connect the other lead to pin 2 NS of tube socket V2 Connect one lead of a 330 K ohm resistor orange orange yellow to pin 2 52 of socket V2 Use sleeving Connect the other lead to lug 2 NS of terminal strip Q Connect one lead of a 330 K ohm resistor orange orange yellow to lug 3 NS of terminal strip Connect the other lead to lug 2 NS Connect one lead of a 001 mfd ceramic condenser to lug 1 NS of terminal strip Q Connec
20. LTATION kit Call or write for assistance Need with Self Service Construction Operation help your You ll find our Technical Consultants eager to help with just about any technical problem except customizing for unique applications The effectiveness of our consultation service depends on the information you furnish Be sure to tell us e The Model number and Series number from the blue and white label The date of purchase exact description of the difficulty e Everything you have done in attempting to correct the problem Also include switch positions connections to other units operating procedures voltage readings and any other information you think might be helpful Please do not send parts for testing unless this is specifically requested by our Consultants Page 27 Hints Telephone traffic is lightest at midweek please be sure your Manual and notes on hand when you call Heathkit Electronic Center facilities are also available for telephone or walk in personal assistance REPAIR SERVICE Service facilities are available if they are needed to repair your completed kit Kits that have been modified soldered with paste flux or acid core solder cannot be accepted for repair If it is convenient personally deliver your kit to a Heathkit Electronic Center For warranty parts replacement supply a copy of the invoice or sales slip If you prefer to s
21. a loss of gain or signal in succeeding stages Intermittent or faulty volume controls and coupling condensers can also be quickly spotted When using the tracer keep in mind that the Signal Tracer will detect the presence as well as the absence of signal For example it is a common practice to use a high capacity by pass condenser in the cathode circuit of the output tube pin 8 of tube E In event the condenser is open there will be a definite indication of a signal at the cathode whereas a good condenser would by pass the signal to ground in the desired manner As a Signal is traced through the audio system the signal level will be extremely high and it will be necessary to reduce the setting of the signal tracer gain control A definite reduction in gain will be noted as the probe is moved from the primary to the secondary of the output transformer This is normal and is due to difference in the turns ratio and impedance of the windings in the transformer Gag Page 20 Noise Locator A rather unique and definitely useful application of the Signal Tracer is its ability to locate noisy and intermittent components in various circuits Basically the noise locatmg feature of the signal tracer permits the application of a DC test voltage to any component in the receiver circuit and the action of the DC voltage in the component is picked up and amplified in the signal tracer itself This DC voltage of approximately 100 volts is availab
22. der on the switch side of the board trim off excess lead TTE UM E Gag Page 16 Slip the length of flat braid through the probe end and bend over as shown Wrap a short length of bare wire around the flat braid and the cable shield and solder Cut off excess cable shield Do not cut off braid Solder an alligator clip to the other end of the braid Slip the terminal board and switch into the probe body and mount the switch with the two small 4 40 screws Push the black probe end into the end of the probe body making sure that the flat braid is between the probe body and the flat side of the probe end Fasten the end with two small self tapping screws Screw the probe tip into the red probe end and remove the collar from the tip Slip the red end into the probe body making sure the wire comes through the hole in the tip Secure the end in the probe body with the two self tapping screws Wrap the wire around the probe tip and replace the collar Remove the paper backing from the RF AUDIOdecal and place it on the probe body with the audio end towards the tip Assemble the red and black test leads as shown fl IHH hi G BEND TOWA lid h it Fd i 101 z p E T FINAL ASSEMBLY AND WIRING WELL Tt CARRE TETA BLA Remove the 3 8 nuts from control RI and switch 51 Mount Le the chassis to the
23. ds connected to the terminal at the time it is soldered This additional check will help avoid errors Use lockwashers under all 6 32 and 8 32 nuts Lockwashers should be placed between controls and the chassis Whensolder lugs are mounted under 6 32 nuts the use of lockwashers is unnec essary Don t apply too much solder to the solder joint Don t apply the solder to the iron only expecting that it will roll down to the connection Try to follow the instructions and illustrations as closely as possible Don t bend a lead more than once around a connecting point If it should have to come off due to a mistake or for maintenance it will be much easier to remove Keep your soldering iron clean Wipe it quickly from time to time with steel wool or a rag When two or more connections are made to the same solder lug a common mistake is to neglect soldering the connections on the bottom Make sure all the wires are soldered EM PANEL ASSEMBLY Locate the short 6 32 screw and set aside to be used later Locate the front panel and position it as shown in Pictorial 1 Mount binding post A using a 6 32 nut Position solder lug as shown in Pictorial 1 In like manner mount binding post F G and H BINDING POST qr BINDING POST BASE i INSULATOR amp 32 NUT F 26 SOLDER Luc gg _ 6 32 DINDING POST BINDING POLT DASE BINDING POST _ INSULATOR An
24. e E Uli CONTROL X 7 SOLDER LUG Start SPEED NUT Push into position with fe he C over edge of metal thumb snapping extru E TI a P sion on lower leg ol SPEED NUT into screw hole Temporarily mount the 1 meg level control RI using a control solder lug Position as shown in Pictorials 2 and 3 In like manner mount the off on switch S 1 using a control lockwasher between chassis and switch Mount the filter condenser C7 so the lug marked with a square is towards the rear of the chassis Twist the mounting lugs 1 8 turn only Mount the power transformer on the bottom side of the chassis with the wires towards the V2 tube socket Use 8 32 hardware This completes the parts mounting check all parts for correct position and make sure all screws and nuts are tightened securely CHASSIS WIRING Connect the short black wire of the power transformer to lug 3 51 of the off on switch SI Twist the two green filament wires of the transformer BLANK together and connect one wire to pin 3 NS and the other wire to pin 4 NS of tube socket V2 Connect one red transformer wire to ground lug U NS of condenser C7 UMBERING ON 7 PIN NUMBERING ON S9 PIN TUBE SOCKET TUBE SOCKET Feed the other red wire from the power transformer through hole P and connect to lug 1 NS of terminal strip T Feed the remaining black wire through hole N and connect to lug 1 NS of terminal strip L Gag
25. e of an audio system Gag Page 22 Output Level Indicator The Signal Tracer can be used as a level indicator merely by connecting the audio probe to some point in the audio system of a receiver and regulating the amount of gain to permit useable action of the eye indicator While performing alignment adjustments the amount of gain or loss experienced in following a specific alignment procedure can quickly be determined by observing the indicator tube The Heathkit Signal Tracer will prove itself an extremely useful and versatile addition to any service shop It is earnestly suggested that the user thoroughly familiarize himself with all phases of its operations so that he may obtain maximum benefit from his investment in this instrument The Heath Company reserves the right to discontinue instruments and to change specifications at any time without incurring any obligation to incorporate new features in instruments previously sold PARTS LIST To order replacement parts refer to the Replacement Parts Price List and use the Parts Order Form furnished with this kit PART PARTS DESCRIPTION No Per Kit Resistors 1 4 1 330 ohm 1 2 w resistor orange orange brown 1 9 1 1 K ohm 1 2 w resistor brown black red 1 20 1 10 ohm 1 2 w resistor brown black orange 1 25 1 47 K ohm 1 2 w resistor yellow violet orange 1 31 4 330 K ohm 1 2 w resistor orange orange yellow 1 35 1 1 megohm 1 2 w resistor brown black gree
26. formation in return Carefully peel away the backing paper from the blue and white identification label Then press the label onto the rear of the cabinet Before installing the instrument in the cabinet using 6 32 screws these preliminary tests should be performed Turn on the instrument and advance the level control Turn the speaker switch on and the noise switch off After a few seconds the 1629 eye tube should light green thus indi cating that the B and filament circuits are functioning properly The shadow position of the tube may be adjusted in the panel by rotating the tube A loud hum should be heard when the probe tip is touched with the hand If operation is normal install the cabinet with 6 32 screws If the Signal Tracer did not operate properly refer to the In Case Of Difficulty section of the manual IN CASE OF DIFFICULTY If the Signal Tracer failed to operate in the preliminary test again check over all connections for unsoldered or poor joints Using the pictorial diagrams trace each lead with a red pencil to make sure each one 1s connected properly Make sure that no component leads are shorted to each other or to the chassis Trace through the instrument by touching the grid pin 2 of the 12CA5 output tube with a screwdriver that is held in contact with Gag Page 18 your finger A low level hum should be heard Move the screwdriver to the grid of the 12AX7 tube section B pin 2 and then to the g
27. hip your kit to the factory attach a letter containing the following information directly to the unit Your name and adress Date of purchase e Copies of all correspondence relevant to the service of the kit e brief description of the difficulty e Authorization to return your kit C O D for the service and shipping charges This will reduce the possibility of delay Check the equipment to see that all screws and parts are secured Do not include any wooden cabinets or color television picture tubes as these are easily damaged in shipment Place the equipment in a strong carton with at least THREE INCHES of resilient packing material shredded paper excelsior etc on all sides Use additional packing material where there are protrusions control sticks large knobs etc If the unit weighs over 15 Ibs place this carton in another one with 3 4 of packing material between the two Seal the carton with reinforced gummed tape tie it with a strong cord and mark it Fragile on at least two sides Remember the carrier will not accept liability for shipping damage if the unit 1s insufficiently packed Ship by prepaid express United Parcel Service or insured Parcel Post to Heath Company Service Department Benton Harbor Michigan 49022
28. ion section through and familiarize yourself with the procedure 3 Lay out all parts so that they are readily available Refer to the general information inside the front and back covers of this manual to help you to identify components Most kit builders find it helpful to separate the various parts into convenient categories Muffin tins or molded egg cartons make convenient trays for small parts Resistors and capacitors may be placed in the edge ofa piece of corrugated cardboard until they are needed Values can be written on the cardboard next to each component The illustration shows one method that may be used Gag Page 5 Leads on resistors capacitors and transformers are generally much longer than they need to be to make the indicated connections In these cases the excess leads should be cut off before the part is added to the chassis In general the leads should be just long enough to reach their terminating points Not only does this make the wiring much neater but in many instances the excessively long leads will actually interfere with proper operation of the instrument Space has been provided for you to check off each operation as it is completed This 15 particularly important in wiring and it may prevent omissions or errors especially where your work is interrupted frequently as the wiring progresses Some kit builders have also found it helpful to mark each lead in colored pencil on the pictorial as it
29. le at the tip of the probe and of course the ground clip of the probe provides the necessary return circuit Some precaution should be observed so that the service technician will not encounter a relatively harmless shock hazard The circuit arrangement is such that even under a dead short circuit condition of ground clip to the test probe the current drain will not exceed 1 mil and therefore the possibility of damage to a receiver component is eliminated To use the Signal Tracer as a noise locator the following conditions should be observed First of all it is important that the receiver to be checked should be disconnected entirely from the AC supply line as all tests will be made on an inoperative receiver The probe switch should be in the audio position for this test and the panel noise switch to ON As previously mentioned a DC voltage in the order of 100 volts is now present between the probe tip and the ground clip WARNING When testing in transistor circuits it is suggested that one end of the component being tested be disconnected from the circuit before applying the DC voltage Failure to do so could result in transistor breakdown Do not apply the test voltage directly across transistor connections To illustrate an example of usage the ground clip should be connected to a B supply point in the circuit The test probe is then applied directly to the plate terminal of an IF tube The gain control of the signal tracer should be at near
30. m This instrument features a number of useful applications which will enable the service technician to quickly locate and diagnose the trouble in the circuit under test Many of the tests will be performed automatically and will require only a few seconds of the technician s time It is suggested however that the user familiarize himself with all phases of the instrument s operation so that maximum benefit can be realized from the investment in the kit The procedures to be followed when using the Signal Tracer are outlined in a general manner only and do not represent the limits of its applications Each individual will develop his own procedures and applications by using the instrument RF Signal Tracing To use the Signal Tracer for RF signal tracing the probe switch should be in the RF position the off on switch and the speaker switch to the ON position and the noise switch to OFF The level control should be adjusted as needed In some cases it may be desirable to turn off the speaker and observe the approximate signal level on the indicator tube Note At near maximum settings of the level control a certain amount of hum will be present this is due to the high sensitivity of the unit and the fact that the input grid has been extended to the probe permitting it to pick up spurious AC fields To illustrate the use of this instrument a typical radio schematic is presented so the test points may be clearly pointed out Let us assume that
31. mary leads are brought out to terminals on the front panel The power switch S1 B in the off position disconnects B so the trans former may be used as a substitute output transformer The secondary leads are connected to the speaker voice coil panel terminals and one side may be disconnected with the speaker switch S4 when the speaker is used as a substitute Resistor R9 and condenser C6 couple a small amount of the output signal to the grid of V3 1629 eye tube The Signal Tracer is transformer operated and uses a silicon diode in a half wave rectifier circuit The transformer also supplies 12 6 volts AC for the tube filaments Gag Page 4 CONSTRUCTION NOTES This manual is supplied to assist you in every way to complete the instrument with the least possible chance for error We suggest that you take a few minutes now and read the entire manual through before any work is started This will enable you to proceed with the work much faster when construction is started We suggest that you retain the manual in your files for future reference both in the use of the instrument and for its maintenance UNPACK THE KIT CAREFULLY AND CHECK EACH PART AGAINST THE PARTS LIST In so doing you will become acquainted with each part Refer to the charts and other information shown on the inside covers of the manual to help you identify any parts about which there may be a question If some shortage is found in checking the parts plea
32. maximum position As the test probe is applied to the plate of the IF tube a sharp click will be heard in the signal tracer s speaker A good clean click will indicate proper circuit continuity and operation If there is any frying or crackling sounds present it would be reasonable to assume that some difficulty is being experienced along the circuit and then the test probe should be moved step by step through each portion of the circuit in order that each component may be progressively checked As the test probe is moved along through coils resistors and other elements toward the ground clip it is quite likely that at some point the noise will disappear When this condition occurs the preceding step should be repeated and further investigation made of the particular circuit involved for a possible faulty component Noisy resistors will very definitely show up as a buzzing or crackling sound The same condition holds true for a cold or rosin soldered connection in the receiver wiring Shorted turns in an IF transformer will also be evident by the noise content The important thing to remember is that a satisfactory component will permit a sharp click to be heard in the speaker whereas a faulty component will result in a characteristic of an objectionable noise Obviously the test voltage can be applied to any component in the receiver For example if an audio coupling condenser is suspected the voltage can be applied across the condenser terminal
33. n 1 38 1 3 3 megohm 1 2 w resistor orange orange green 1 60 2 68 K ohm 1 2 w resistor blue grey orange Condensers 21 140 4 I ceramic condenser 21 27 3 005 ceramic condenser 21 36 1 Ol condenser 25 02 1 50 50 150 v 20 25 v 3 lug twist prong condenser Tubes Diodes Rectifiers 56 26 1 Crystal diode 97 21 1 Silicon diode 411 26 1 12AX7 tube 431 2 411 30 1 1629 tube 411 111 1 12 5 tube Terminal Strips Sockets Binding Posts 75 17 10 Insulator bushing 15 23 1 Terminal board 427 3 5 Binding post base 491 10 431 2 1 2 lug terminal strip 431 10 1 3 lug terminal strip 431 16 1 2 lug terminal strip 431 51 1 2 lug vertical terminal strip 434 15 1 7 pin wafer tube socket 434 31 1 B pin octal tube socket 434 77 1 9 pin wafer tube socket with center ground 100 16 2 2 Binding post cap black 100 16 18 3 Binding post cap red Wire Sleeving 89 1 1 AC line cord 340 2 1 Length bare wire 441 1 1 Length black test lead 341 2 1 Length red test lead 343 2 1 Length RG58U Coax 244 59 1 Length hookup wire 345 1 1 Length braid 346 1 1 Length 1 16 sleeving 347 1 1 Length 8 wire cable Controls Switches 10 67 1 1 meg control 60 1 SPST slide gwitch 60 7 1 SPDT slide switch small button 63 145 1 2 position rotary switch 1 wafer PART PARTS DESCRIPTION No Per Kit Cabinet Chassis Speaker 60 236 1 Cabinet aluminum 209 10 1 Speaker grille 211 15 1 Handle 401 21 1 3 1 2 speaker 20
34. ngeably with this instrument when required The panel arrangement of the Signal Tracer will permit the utilization of other shop equipment for test procedure For an example a can be connected either from B to plate or 3 from plate to common ground terminal The VTVM will of iN course be switched to the AC position and the calibrated scale jn i DAHANA PLIG r F o SPADE Liat of the meter could be read directly for precise measurements 3 during alignment procedures and gain calculation The output i trans former secondary connections should be utilized if the test requirements required the elimination of DC voltage present in the primary circuit A reduction in gain indication should be expected Test Speaker In service work it is frequently necessary to remove the chassis of a radio or TV receiver to the repair shop in order to properly complete repair work In many instances the speaker is a separate piece of equipment and in some cases it is installed in a rather inaccessible cabinet location With the Signal Tracer at your disposal it is not necessary to remove the speaker in view of the fact that the output transformer and speaker are available as test or substitution units In the majority of cases the original receiver circuit requirements specify the use of a permanent magnet type speaker and therefore the substitution can be readily made The advan
35. or otherwise secure the wire or wires to the terminal so a good joint is made without relying on solder for physical strength Page 6 To make a good solder joint the clean tip of the soldering iron should be placed against the joint to be soldered so that the terminal is heated sufficiently to melt solder The solder is then placed against both the terminal and the tip of the iron and will immediately flow out over the joint Refer to sketches on page 6 and 7 Use only enough solder to cover wires at the junction it is not necessary to fill the entire hole in the terminal with solder Excess solder may flow into tube socket contacts ruining the socket or it may creep into switch contacts and destroy their spring action Position the work so that gravity tends to keep the solder where you want it A poor solder joint will usually be indicated by its appearance The solder will stand up in a blob on top of the connection with no evidence of flowing out caused by actual wetting of the contact A crystalline or grainy texture on the solder surface caused by movement of the joint before it solidified 1s another evidence of a cold connection In either event reheat the joint until the solder flows smoothly over the entire junction cooling to a smooth bright appearance Photographs in the adjoining picture clearly indicate these two characteristics A good clean well tinned soldering iron 1s also important to
36. rid of section A pin 7 The hum or noise should become louder with each stage If no sound is heard look for trouble in that particular stage CAUTION To avoid any shock hazard when making the above test make sure that only the pins that are mentioned in the text are touched with the screwdriver and the other hand or any other part of the body is not in con tact with the chassis pr any other conductor that may provide a return path to ground If after careful checks the trouble is still not located check voltage and resistance readings found on the schematic diagram Note All voltage and resistance readings were taken with a Heathkit Vacuum Tube Volt Meter Voltage and resistance readings may vary 20 due to line voltage variations and the tolerance of components A reading that is off more than 20 would indicate probable trouble in that particular stage A review of the circuit description may also be helpful in indicating where to look for the trouble NOTE In an extreme case where you are unable to resolve a difficulty refer to the Customer Service information inside the rear cover of the Manual Your Warranty is inside the front cover USING THE SIGNAL TRACER The IT 12 Signal Tracer 15 one of the simplest yet most effective instruments the service tech nician can use for rapid accurate trouble shooting in radio and TV circuits The tracer is of the untuned type to simplify operation thus holding control manipulation to an absolute minimu
37. s pick ups and speakers Substitution speaker and output transformer Output level indicator CIRCUIT DESCRIPTION The Heathkit Signal Tracer is a transformer operated quality instrument consisting primarily of a high gain audio amplifier A built in 3 1 2 speaker is provided for sound and an electron ray tube permits visual observation of the output level Additional features are RF and audio inputs in one convenient probe noise locator circuit and substitution speaker and output transformer Observing the schematic it can be seen that the RF audio switch S2 mounted directly in the shielded probe body switches condenser Cl and a crystal diode in or out of the circuit for RF or audio applications Condenser C1 isolates the crystal diode to prevent any voltage damage The Noise Switch S3 connects B to the probe lead through resistor R14 to provide the noise locator circuit The switch S2 in the probe must be in the audio position for this function Signals from the probe are coupler through condenser C2 to the gain control R1 and in turn through condenser C3 to the input grid of VI Condenser C2 and C3 prevent noisy operation of the gain control The tube VI 12AX7 is a high gain dual triode with the plate of section A coupled through con denser C4 to the grid of section B The condenser C5 couples VI B to the grid of V2 12 CA5 beam power output tube The primary of the output transformer is center tapped and all three pri
38. se notify us promptly Resistors generally have a tolerance rating of 10 unless otherwise stated in the parts list Therefore a 100 K resistor may test anywhere from 90 K to 110 K The letter K is commonly used to designate a multiplier of 1000 Tolerances on condensers are generally even greater Limits of 100 and 20 are common for electrolytic condensers The parts furnished with your Heathkit have been specified so as to not adversely affect the operation of the finished instrument The Signal Tracer is not difficult to construct but it is extremely important that particular emphasis be placed on the desirability of following parts placement and wiring dress as shown in the manual This is important in order that the operation of the Signal Tracer be hum free and that a motor boating condition is not induced The wiring dress and parts layout in the manual has been proven thoroughly satisfactory through the construction of a series of laboratory models While the arrangement shown is probably not the only satisfactory layout it is the result of considerable experimentation and trial If followed carefully it will result in a stable instrument operating at a high degree of accuracy and dependability We suggest you do the following before work is started 1 Attach the large fold in pictorials to the wall above your workbench 2 Go through the entire assembly and wiring instructions This is an excellent time to read the entire construct
39. t the other lead to lug 3 NS Connect one lead of a 3 3 megohm resistor orange orange green to lug 1 S2 of terminal strip Q Connect the other lead to pin 7 NS of tube socket V2 Strip both ends of a 4 length of wire and connect one end to pin 7 of V2 S2 Dress the wire towards front of chassis Strip both ends of a 4 1 2 length of wire and connect one end to pin 6 SI of V2 Dress towards the front center of chassis Strip both ends ofa 2 1 2 length of wire and connect one end to lug 1 SI of switch SI Connect one end of a 41 2 length of wire to lug 1 NS of condenser C7 Feed the other end through hole N and connect to lug 2 NS of terminal strip T on the top side of the chassis Connect one end of a 5 1 2 length of wire to lug 2 NS of terminal strip T Connect the other end to lug 2 SI of switch SI Connect one end of a 5 length of wire to lug 2 NS of terminal strip L Connect the other end to lug 4 SI of switch SI Connect the cathode lead of a silicon diode to lug 2 53 and the other lead to lug 1 S2 of terminal strip The cathode end is marked with a color end a color dot or a color band Pass the line cord through hole M Connect one wire to lug 1 S2 and the other wire to lug 2 S2 of terminal strip L Install the line cord strain relief in hole M See Detail 5A OuTSIDE OF CHABEIS PREPARING THE EYE TUBE ASSEMBLY Start the two 6 sheet
40. tage of this feature of the signal tracer is readily apparent when consideration is given to the time and effort conserved by eliminating the necessity for speaker removal and reinstallation on every service job In addition the possibility of damage to the speaker cone during the handling process is eliminated Audio System Quite frequently the service technician will be called upon to service automatic record changers or phono mechanism Of course this equipment is usually removed from the cabinet of the receiver and transported to the service shop On making mechanical repairs or adjustments on the changer mechanism it 1s frequently desirable that the output of the phono cartridge be checked and actual conditions of tone reproduction simulated Here again it is a relatively simple matter to connect the audio input of the Signal Tracer to the output cable of the record changer The changer output as heard in the speaker of the tracer will permit detection of any irregularity in mechanical operation such as turn table wow or thump or any objectional noise that could be transmitted through the phono cartridge and reproduced as an undesirable condition This same procedure could be used in checking microphones and musical instrument pickups and here again the results obtained are interpreted on the basis of comparison made with previous tests on similar equipment The signal tracer can be used in checking FM tuners or other equipment requiring the us
41. watts VI 12AX7 high gain dual triode input cascade amplifier V2 12 5 beam power output tube V3 1629 electron beam visual indicator 3 1 2 permanent magnet 4 input lead for RF and audio w switch in probe body Two 3 panel test leads with alligator clips 4 1 2 wide x 7 1 2 high x 4 deep 4 Ibs Page 2 1300W T1VNOIS Tv arrv TvnstA by iT a LIH IV3H Pe aee 3 1 Diane LM i 3H1 4O OlVW3H2S oe iJ ww Ey piy aS py A LL sOmqns arg Eb RUS WA LA i r ED 0 URN p ee LD serospuns US EF IDOL 2415 5E 7 aa 3 30010 MOSES i Gag Page 3 INTRODUCTION The Heathkit Visual Aural Signal Tracer is a compact service designed instrument incorporating many features that meet the everyday needs of the service technician Some of the features and applications are listed below High gain position for direct signal tracing in RF or IF circuits e High gain position for signal tracing in audio circuits Convenient RF or audio switch in probe body e Tracer may be used for AM FM and TV circuit exploration Visual signal indicator Noise locator circuit Utility amplifier for checking record changers tuners etc e Useful for checking microphones musical instrument
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