Tenor 350M User Manual, November 2008
Contents
1. 10 AC Mains Voltage isse otro booa cca D Warm B Dass Hon ec Do Lc init Kt cn ea RUNI Mute ODEFULIOL cod te iode ee t pedet Peltoda esie uio to da tau totes a atari ed nt e erre TT TODO TEE as a sns rapa Std Special Design cus daa Pawer SUD DIY ca Greco cca tutte spectu 2 Environmental Considerations 13 PRONE Panel eb aerei bes ia cou OR AOI 14 SWIECI eundo otv Diis pd Cant dap CR na a 14 Front Lens Indicator Light sso boda OI OUR A 15 NAICS 15 Rear Panel amp Internal View eese LO 167 RC 16 AC 5 amp uio tea D Rope po aient AER 16 Remote TUTOR JOE Koc d IS E HR A Ain ao M REI MR LUE 16 Single Ended and Balanced Inputs tette 17 o dspeaker Binding Posts esee 17 SOM Internal VIGW ote OLD Dofus 17 Troubleshooting amp Protection Circuitry 18 Internal Fuses Associated With Protection Circuitry sss 18 Other Internal FUSeS 18 Example Protection 1 e tee oe2. 19 No Audio Front Panel Lens Light is Dark 19 No Audio Front Panel Lens Light is Blue 19 No Audio Front Panel Lens Light is Red 19 No Audio Front Panel Lens Light is Red flashing 20 Audio Front Panel Lens Lieht turns briefly from Blue normal to Red 20 Gro nd HUM 20 Care and Maintenance 5 d HERE WU Hp GO REO taie 21 Wood Faceplate 21 Metal Ch ssis ang scm en Editi dte Rte ito cR 21 Electrical Connections on Rear Plate ttes 21 Audio Board Vacuum TUDES t RI OR M Dea en 21 350M S ifi j Tenor onm av an vd tnb endet 2 Warranty ssi ro b OR ev ntc did Prod Regi j rod uct Registlat TOIT cin XR OR ERRARE E E a 24 Tenor Contact Information eee 25 Owner s Notes 6 Introduction Congratulations Congratulations on the purchase of your new Tenor 350M Mono Blocks Tenor 350M Ultimate Reference Amplifier We are very proud of the extensive engineering de sign and craftsmanship in our amplifiers and are confident that our Tenor 350M will deliver the musical experience of your lifetime Safe Set up Instructions This Owner s Manual is provided to assist in the unpacking installation and ongoing care of your Tenor 350M amplifier It is recomm
3. 2 x ECC803S 1 x ECC99 6 x 7044 Soft start 3 minute Remote Quae TS ees oen E TUS 3 to 30 VDC 1 8 connector Cooling ees oe V Natural convection Micro phonic Fully suspended audio board Binding ee er IO RE Bee ee een ves 2 sets WBT D tm 11 Protection against eese eene heat dc offset current static RF esce Ue RN E ground pollution short circuit Maximum power consumption 1850 W 120V 60 Hz Idle power consumption 280 W 120V 60 Hz Supply voltage factory set sese 100 to 250VAC 50 60 Hz AC mains Input oie esee 20A IEC detachable power cord Weight per mit iere et ce cea ERR o Ve eer 118 lbs 53 5 Shipping weight in custom road case 148 165 67 2 kg Dimensions iure RI NER RS cues V bardeaveenetss 19 5 W x 28 Dx 9 5 H 8 Ohm 1kHz Outside signal path Tenor Inc reserves the right to make improvements which may result in specification changes without notice May 2008 Warranty Tenor Inc Canada warrants the Tenor 350M to be free from defects in materials or workmanship for a period of 5 years from the date of the original purchase provided the amplifier is registered with Tenor Inc Canada within 90 days of the pur
4. the on position Similarly providing no voltage will cause the amplifier to turn off This feature allows the amplifier to be turned on via a 12 volt trigger provided by an audio video preampli fier as an example Please be mindful of the volume level of the preamplifier when the amplifier come on line after the standard warm up time of 3 minutes Failure to do so could cause amplifier and speaker damage which would not be covered by the Tenor Warranty Power Requirements AC Mains Voltage Tenor amplifiers can be powered using conventional power company voltages ranging from 100 Volts to 250 Volts at either 50 or 60 Hz The voltage for your application must be specified at the time of ordering so the transformer can be configured ac cordingly and the correct AC mains cable can be supplied The use of power conditioners on the AC power mains feeding the Tenor 350M ampli fier is not recommended due to the current limiting effect of most power condition ers 20 amp circuits at 100 120 Volts and 10 amp circuits at 220 250 Volts provide the ultimate source of power for maximum dynamic headroom of the Tenor 350M but would require custom cables not provided by Tenor Appropriate regional Electrical Codes and Professionals should be consulted regarding any custom electrical configu ration beyond the regular domestic wiring of your installation Warm Up The master Mains Power switch of your Tenor 350M amplifier is located at the t
5. the heat sink is over 75C the amplifier lens will flash red in 1 second increments Each rib fuse has a red LED Light Emitting Diode that identifies it has blown which makes identification very straightforward If all conditions are met the amplifier will un mute or go on line after 3 minutes when the jumper is set on automatic If the jumper is set to manual after 3 minutes has passed you can press the mute but ton to on line again Other Internal Fuses There are 5 other fuses as follows 2 Amps SB TR5 12 8 Volts DC heater voltage F1 15 Amps SB 218 6 6 Volts DC heater voltage F2 200 milliAmps TR5 285 Volts DC for Audio Board F5 200 milliAmps FB TR5 e 285 Volts DC for Audio Board F6 15 Amps SB MDA for 120 Volts or 8 Amps SB MDA for 240 Volts for Mains fuse on rear panel Ur UC Nc Please Note Only fuse 5 the Mains fuse is user replaceable all others require Tenor Service Example Protection Scenarios No Audio Front Panel Lens Light is Dark The simplest condition for no audio is the amplifier is simply not getting power and perhaps not plugged into the AC mains This should be verified before pursuing any further remedy If power is provided correctly to the amplifier the following 5 con ditions must be met before the amplifier will proceed to the 3 minute warm up as follows Fuse on Relay Board ok Left Rib temperature less than 80C Right Rib temperature l
6. with an expe dited method of transportation The use of Vacuum tubes not supplied by Tenor Inc will void the Warranty Attempting to repair or modify Tenor 350M amplifier will void the Warranty Missing or altered serial numbers automatically void the Warranty Product Registration To ensure your amplifier is covered by the Tenor Inc 5 year warranty it is mandatory that you register with Tenor Inc by mail or email within 90 days of purchase and pro vide us with all of the following information Model Number Serial Number of each 350M __ Date of Purchase Dealer and or Distributor s Trade Name amp Contact Name Dealer and or Distributor s Phone Number Dealer and or Distributor s Email Address Dealer and or Distributor s Address Your Phone Number Your Email Address Your Address Failure to provide any of the above information will void your warranty registration Tenor Contact Information Before returning your amplifier to Tenor Inc it is necessary to receive a Return Authorization Number RAN as stated in Warranty Conditions A RAN will be issed by contacting Tenor Inc and describing the nature of your service request using either email or phone as follows Tenor Inc Service Email service tenoraudio com Tenor Inc Service Phone Number 514 933 6035 Once you have received a RAN you can ship your amplifiers to the following address with the RAN marked clearly on the outs
7. ENOR INC SERIAL No 6021 Cautions MADE IN CANADA BY TENOR INC SERIAL 6021 C CAUTION ATTENTION MONO POWER AMPLIFIER MODEL 350M AC Mains On Off amp Fuse Remote Turn On Jack ET NC XR ECTE Ee POWER FUSE EN USE SAME amp RATING AC MAINS 50 60 Hz 1800 VA MAX Single Ended and Balanced Inputs Loudspeaker Binding Posts AUDIO GND I GND UNBALANCED o _ BALANCED LIFT GND PARALLEL OUTPUTS 350M Internal View Rail Fuses Transformer Power Supplies Left mosfet Rail Right mosfet Rail Audio Board mosfet Cooling Fins Troubleshooting amp Protection Circuitry Overview Internal Fuses Associated With Protection Circuitry There are 6 internal fuses associated with the protection circuitry as follows 7 Amps 314 amp 85 volt fuse to left Rib F1 7 Amps 314 85 volt fuse to left Rib F2 7 Amps 314 85 volt fuse to right Rib F1 7 Amps 314 85 volt fuse on right Rib F2 200 milliAmps SB TR5 125 volt fuse to Power Supply Board 200 milliAmps SB TR5 125 volt fuse to Power Supply Board F4 Oo UA Cn Please Note None of these fuses are user replaceable all require Tenor Service During the initial 3 minutes warm up the amplifier will monitor the above fuses as well as the temperature of the heat sinks In the event that a fuse is blown and or
8. If the jumper is set to manual the amplifier will require you to press the mute button to return to on line status after 3 minutes No Audio Front Panel Lens Light is Red flashing During the 3 minute warm up the amplifier monitors the 7 following conditions 80 Volts on left Rib F1 80 Volts on left Rib F2 80 Volts on right Rib F1 80 Volts on right Rib F2 125 Volts on front Power Supply Board F3 125 Volts on front Power Supply Board F4 Heat Sink temperature less than 75C no So ba cs If any condition from 1 6 and or 7are not met then the front panel lens light will flash red The fuses on 1 6 are identified under Troubleshooting and will have a red LED Light Emitting Diode if they are blown The amplifier will return on line automatically or can be manually after 3 minutes if all conditions have been cleared Audio Front Panel Lens Light turns briefly from Blue normal to Red On very loud musical passages the current draw from the AC mains available at the wall could be lowered to 110 Volts when ideally it should be 125 Volts or 220 Volts when it ideally should be 240 Volts thereby creating a DC offset in excess of 130 mV causing the amplifier to mute and turn the lens light red 1 second later the loud passage is over and the amplifier is now receiving proper voltage and plays normally again thereby returning to blue It may be possible to reconfie
9. Tenor Inc Version November 2008 Tenor 350M Mono Blocks 3 xS 5 T vo o3 5 gt Important Safety Instructions e Please read this Owner s Manual for your own safety and the protection of your Tenor equipment Once you have installed your Tenor equipment store this Owner s Manual in safe place for future reference if necessary e Please heed all warnings e Please follow all instructions e Do not use this equipment near water or where there might be a chance it could come in contact with water e Clean only with a clean dry cloth e Do not install near a heat source such as radiators heat registers stoves or any other source of heat e Do not defeat the safety purpose of the polarized and or grounding type plug A po larized plug has two blades with one sliehtly wider than the other A erounding plug includes the third ground prong In the event the plug provided does not fit your power outlet consult an electrician for assistance Failure to do this may result in damage to the equipment and or possible injury or death e Please protect the power cord from being walked on or pinched particularly at the wall and at the plug on the rear panel of the equipment e The use of extension cords and or convenience plugs is not advised due to the power requirements of the equipment e Please mount equipment as specified in User Manual e Pl
10. a number of conditions that could harm the amplifier or attached equipment all with out interfering with the audio signal The 6 main conditions being monitored are as follows Low AC main voltage DC offset at speaker terminals AC at speaker terminals Static discharge Ground pollution RF Radio Frequency levels If any of the above conditions exceed prescribed levels the amplifier will automati cally protect itself by muting The front panel lens will change from blue to red when this occurs Muting achieves the following e Shorts the RCA and Balanced XLR inputs through a resister to ground e Removes the bias to the output transistors This effectively removes all DC offsets and AC current to the speaker terminals In the event that the offending condition has been removed or corrected the amplifier will return to an line status whereby the lens light will now be blue and the amplifier will function as normal Should the fault or condition not be removed the amplifier will cycle between red and blue in 1 second intervals until the fault disappears or the amplifier is powered off by the operator and the condition is remedied An internal jumper switch can be set to require a manual reset which keeps the am plifier in mute after a fault condition which can only be returned to on line status by the operator selecting the mute button under the front panel If the am plifier faul
11. age particularly if the lighting is low which is often the case in a listening room 2 Party Isolation Stands Mechanical isolation of the Tenor 350M is excellent so 3 party isolation stands are not mandatory If 3 party isolation stands are to be used please ensure that their specifications support an amplifier weighing 118 lbs b4kg and the 2 3 1 3 weight distribution towards the rear is taken into consideration in the design Placement AC power mains should be within reasonable access and although both left and right amplifiers can be installed on one 15 amp circuit 120 Volts 8 Amps 240 Volts the full dynamic headroom potential of the Tenor 350M amplifiers will only be achieved with a dedicated circuit for each amplifier The efficiency of your speakers and the size of your room play a large factor in the current draw necessary to recre ate the recorded musical event to realistic and enjoyable levels Ventilation Ventilation of the Tenor amplifier occurs by convection without the need for electric cooling fans Vents in the bottom of the chassis and top cover plate allow sufficient cooling under normal operating conditions It is imperative that these vents be kept clean and unobstructed Please note the two amplifier chassis should never be stacked one on top of the other It is normal for the top cover panel to get a warm over the tube audio board located towards the front of the chassis It is necessary to keep this top c
12. ation Break in Period Components of the Tenor 350M are broken in prior to assembly for a period up to 200 hours Following assembly each amplifier is burned in at the Tenor factory for a pe riod of no less than 100 hours allowing each electronic component to stabilize and achieve its optimum electrical and musical potential as a system Each amplifier is then calibrated to the factory specification and is designed to remain within toler ance for a period up to 10 years or more depending on use and care Tube Life The Tenor 350M is designed to operate within desien specifications for a period close to 10 000 hours As a typical example a Tenor 350M used each and every day for 3 hours under normal use will last almost 10 years before it will need a tube refit and calibration A meter is located on the back panel showing the hours of enjoyment this amplifier has delivered and will be shipped from the factory reading zero hours Most owners will experience a lifetime of listening pleasure without ever reaching the 10 000 hour maximum When the 10 000 hours of use has been achieved the amplifier should be returned to the factory for re tubing and calibration Special Desien Features Power Supply The heart of the power supply for the Tenor 350M is a custom designed and manufac tured high current transformer that accommodates various international voltages and frequencies in providing specific line voltages for each stage o
13. chase date and there is valid proof of purchase from an authorized Tenor Inc dealer or distribu tor Following the receipt of your registration and upon successful validation that your amplifier has been purchased from an authorized Tenor Inc dealer or distributor you will receive a custom plate for mounting on the back of each amplifier which shows the amplifier has been purchased from an authorized dealer or distributor and has been custom made for you This plate must be affixed to the back of the amplifier for the warranty to be valid Any amplifier returned to Tenor Inc without this custom plate affixed will have its Warranty revoked Vacuum tubes are guaranteed for 10 000 hours or 5 years from the original purchase date whichever comes first Should the Tenor 350M be defective during the 5 year Warranty period Tenor Inc elects at its sole discretion to either repair or replace the unit free of charge Prior Authorization and a Return Authorization Number RAN are mandatory for Tenor Inc to undertake any service under the aforementioned Warranty Transportation costs and insurance costs for shipment to Tenor Inc s Canadian Service Facility for Warranty repair are the responsibility of the owner Transportation costs and insurance from the Canadian repair facility to the owner will be the responsibility of Tenor Inc and the shipment method will be eround sea or equivalent unless the owner agrees to pay the surcharge associated
14. d void your Warranty Keep out of direct sunlight if at all possible Metal Chassis and Top Plate The Metal Chassis and Top Plate need very little care other than dusting from time to time Do not use spray wax or dusting liquid as it may contaminate the electrical components inside and could void your Warranty Dusting with a soft brush is recom mended Electrical Connections on Rear Plate From time to time it is good to disconnect and reconnect your cables at the rear to improve any degradation due to normal electrical oxidization Make sure your ampli fier is turned off and that you disconnect then reconnect each connecter one at a time to avoid any mix up Audio Board Vacuum Tubes The Audio Board is home to all of the Vacuum Tubes in the Tenor 350M Every tube is matched and calibrated in the circuit so unless you are specifically directed by Tenor to alter these tubes they should never be touched except by trained Tenor service technicians Each tube has been selected for its optimum electrical characteristics and the entire circuit has been calibrated for these specific tubes Any alteration of the tubes may cause the Tenor 350M to be out of specification and any failure as a result would not be covered by Warranty Tenor 350M Specifications Amplifier esee eee ue tr ttr cede ns e Rae RO Mono Power amplifier Voltage eee e doe ere e eoe sr ERE CRY 32 dB Unbal 30 dB Bal Rated po
15. ease unplug equipment during lightening storms and when not in use for long peri ods of time e Refer all service of equipment to qualified personnel In the event the equipment has been damaged dropped exposed to water or foreien objects have entered the cabinet disconnect immediately from power source and consult a qualified service technician WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS AP PLIANCE TO RAIN OR MOISTURE CAUTION TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER ALL SERVICING TO QUALIFIED PERSONNEL Table of Contents Introd ction ore p pe PEOPLE Pug CongratulattOIme aa deo bud aatis ti bed dote tue d Safe Set Up AHstr ctiolis iso a be Ead Abl eal Gliese eau Desioen Principles oca Precision Engineering amp 5 N Unpacking oio ea AE viu eoo roit Poen be ub IEE bn Lifting Caution 148lbs 67 uscito o oto lu oto Ir avel Cases c Qu DEDI DIM I A RN LO D AUG NA NOON List of Items Included with pair of Tenor 350M s N MoVIhe Amph fels o N E Co SDEUKGES cauto GRE Remote Power Requirements
16. eight and size of each amplifier it is suggested that careful attention be given to the following Lifting Caution 148lbs 67K9 Each amplifier and carrying case has a combined weight of 148 lbs 67kg One must exercise extreme caution when lifting and moving an amplifier It is suggested that 2 people unpack and position each amplifier for optimum placement in your system Travel Cases The travel cases have been custom designed to provide the ultimate protection dur ing transit and storage of the amplifiers Each empty case weighs approximately 30 lbs They should be stored away in a safe and dry location when not in use Given that you have opened the lids of the travel case to access this manual please set them aside while you position your amplifier for installation in your system Each amplifier weighs 118 lbs 54kg and has a heaw transformer located towards the rear The balance point of the amplifier is not at the centre of as one might assume but actually about 2 3 towards the rear creating an awkward load if lifted in the centre Caution should be used in lifting the amplifier upwards out of the lower portion of the travel case to make sure that nothing scratches the beautiful Tenor finish It is recommended that the travel case and amplifier be positioned close to its final loca tion using the wheels of the travel case if necessary Ideally 2 reasonably strong peo ple should lift the amplifier upwards from the travel case un
17. ended that you take a few minutes to acquaint yourself with the contents of this manual before you unpack further so that you are safe and the amplifier is handled correctly Design Principles The passion and desire to attain the most realistic and live musical reproduction has been a lifetime goal of Tenor Building on our classics the internationally acclaimed Tenor OTL Output Transformer Less and Tenor 300 Hybrid the new Tenor 350M Ul timate Reference Amplifier delivers musicality and transparency beyond any other known amplifier Tenor s proprietary research in the field of harmonic structural integrity is the es sence behind the transparency and resolution of the Tenor 350M Ultimate Reference Amplifier It is our opinion as is many industry experts the Tenor 350M is the finest amplifier ever made Period Precision Engineering amp Assembly Each Tenor amplifier is custom manufactured in Montreal Canada by master techni cians dedicated to exacting standards Rigorous testing and component matching is conducted on all amplifier components prior to assembly Once assembled each am plifier is rigorously tested for several hundred hours to ensure complete equilibrium prior to its ultimate calibration Finally the Tenor 350M is securely packed in its own custom travel cases for transport to the new owner Every Tenor Amplifier is carefully fitted for transit into its own custom travel case Given the w
18. ess than 80C Transformer temperature less than 120 Mains Fuse ok Ur UC Nc If there is no red lens light on but the red light on the rear switch is on then condi tion 2 3 4 5 need to be addressed If the there is no front red lens light on as well as no red light on rear switch then fuse on 1 needs to be addressed Conditions 2 3 and 4 can be remedied by simply allowing the amplifier to cool down by powering off for a sufficient period of time Failure of condition 1 requires Tenor Service No Audio Front Panel Lens Light is Blue When there is no audio and the front panel lens light is blue suggests that the input RCA or Balanced XLR and or the speaker cables are not connected properly Please power off the amplifier and examine these connections Please take particular note of the input toggle on the rear panel to select between RCA and XLR as it may be opposite to what you intended No Audio Front Panel Lens Light is Red continuous When there is no audio and the front panel lens light is red suggests that your ampli fier has encountered a fault and is now in mute The 6 conditions being monitored are Low AC main voltage DC offset at speaker terminals AC at speaker terminals Static discharge Ground pollution RF Radio Frequency levels If the internal protection jumper is set to automatic the amplifier will return to Blue after a 3 minute interval if the condition has corrected itself
19. f the amplification process The Tenor 350M Mains voltage must be specified when ordered to match the voltage and frequency provided by your local power company This also determines the proper cable to be shipped with the amplifiers Audio Amplification The Tenor 350M combines the voltage output of tubes with the high current output of mosfet transistors in an ingenious Tenor hybrid design By leveraging the best of each technology in a unique proprietary design the Tenor 350M is the ultimate in resolution and transparency in a dual chassis mono block design The first stage of the 350M design is based on the original all tube OTL Output Transformer Less proprietary concept pioneered by Tenor in the late 1990 s This all tube stage provides 10 watts per channel of pure Class A voltage at a relatively high impedance by speaker standards which is ideal input for a bank of mosfet tran sistors The second stage of the 350M circuitry processes this voltage rich 10 watts per chan nel and provides additional current to increase the power to 350 watts per channel 8 ohms at the speaker terminals The sonic beauty of the tube with the massive power of the mosfet is optimized in a unique proprietary Tenor design for an audio presentation that is simply breathtaking Protection Tenor amplifiers have a sophisticated monitoring and protection circuitry that allows the amplifier to operate at peak musical potential while continuously monitoring
20. ide of the shipping cases Please note that shipping costs and insurance are the responsibility of the shipper Tenor Inc 1001 Lenoir Suite A 209 Montreal 226 Phone Number is 514 933 6035 Fax Number is 514 933 3177 Other contact information is as follows Web Site is www tenoraudio com Sales Email salesetenoraudio com Owner s Notes
21. is dark i e not lit red or blue and in the event of a fault blue will change to red in 1 second increments Dark means that the amplifier is either not on or there is no power provided to the amplifier Red indicates that the amplifier is in mute indicating that 1 It is warming up after an initial power up or 2 It has been muted manually or 3 A fault condition exists that caused the amplifier to mute given the inside jumper is set to manual More specific details on this are provided in the Protection section under Special Desien Features in this manual The lens turning from red to blue in 1 second increments means the inside jumper is set to automatic and the amplifier is attempting to clear the problem and return to a normal on line state If the fault condition is not corrected and the amplifier continues to cycle between red and blue it is recommended that the amplifier be turned off until the condition can be identified and corrected properly Mute Switch The mute switch is located below the front panel on the underside of the chassis Please refer to Mute Opera tion under Power Requirements to better understand the operation of this switch and its role in the protection circuitry Rear Panel 4 Internal View AUDIO GND UFT GND USE SAME TYPE amp RATING UNBALANCED BALANCED GND MONO POWER AMPLIFIER MODEL 350M MADE IN CANADA BY T
22. op right of the rear panel when looking at the amplifier from the front This engages the power rocker switch on the front underside of the chassis just behind and below the front panel When pushed to the on position this switch operates the relays providing power to the Tenor 350M The lens in the front panel will glow red identi fying the Tenor 350M is now in mute for the 3 minute warm up and stabilization period Once 3 minutes has expired the Tenor 350M is now warmed and stabilized so the lens will then change from red to blue showing the amplifier is now on line and ready for use It will take up to 60 minutes for the 350M to reach optimum operating temperature Mute Operation Mute operation is achieved by pushing the round centre button located on the under neath of the chassis just behind the front panel and to the left of the secondary power switch The muting function shorts the inputs and removes the DC offsets and power to the speaker terminals Mute is not a standby in the traditional Instru ment or PA Amplifier sense as the Tenor 350M is fully powered but simply muted It is not advisable to leave the amplifier in mute when not in use as the tube life will be diminished considerably The amplifier is designed to provide near full potential immediately following the 3 minute warm up and stabilization period following power up Maximum dynamic headroom and transparency is achieved following about 60 minutes of playing oper
23. over installed and completely clear at all times to ensure maximum ventilation allowing the proper uni form cooling of internal components The heat sinks located on each side of the am plifier provide cooling for the mosfet output devices The heat sinks run reasonably cool as long as they are kept clean and unobstructed Special Note Operating the amplifier in the bottom half of the travel case will block the lower air intake vents which could result in overheating and will void the War ranty if damage occurs Failure to keep the top plate clear resulting in overheating will void the Warranty Source Components The transparency and of the Tenor 350M amplifier requires your source compo nents to be of a sufficient high quality Any imperfections at the source will most definitely be noticeable In practice Tenor amplifiers allow most source components to sound their best nev ertheless the ultimate in sound reproduction is only achieved with the use of the fin est digital and or analogue audio source equipment and cables Either single ended RCA or balanced XLR inputs can be used Sufficiently long cables allow the convenient location of the source equipment away from the amplifiers and in close proximity to the user It is our recommendation that single ended cables be used unless intercon nects exceed 50 feet or 15 metres whereby external noise may be induced then it is recommend to use balanced interconnects Gene
24. rally all source equipment can be powered using a single Mains circuit thereby minimizing the possibility of eround loop hum It is recommended that this be a sepa rate circuit from the amplifiers but have the same overall erounding Speakers The Tenor 350M is capable of driving virtually any speaker with an average impedance of 4 to 16 Ohms and capable of handling 350 watts continuous power The impressive Tenor 350M dynamic headroom necessitates speakers that can handle this power see Tenor 350M Specifications or you will risk damaging your speakers The re creation of the musical event in a realistic manner requires substantial current Your speak ers can be easily damaged if they are not capable of handling this level of power Al though Tenor has very effective protection circuitry it is still possible to overdrive your speakers and as such Tenor is not responsible for any speaker damage Speakers should be connected with respect for polarity whereby the positive or red output is attached to the same of the speaker Similarly the negative or white should be attached to the negative or black of the speaker Remote Turn On Jack Providing continuous 12 volts DC to the Remote Turn On Jack via a mini phone plug will automatically turn the amplifier on similar to the front rocker switch located slightly off centre at the front and just under the wood face plate This will only work if the main power switch on the back panel is in
25. t has not been cleared it will immediately return to the muted state and the lens will continue to be red Environmental Considerations Considerable effort went into the efficiency of the Tenor 350M and its power con sumption To maximize the efficiency of the amplifier and to minimize its carbon foot print Tenor undertook a yearlong project to design and test various trans former designs Adhering to close tolerances and state of the art materials the new 350M consumes 20 less energy dissipates less heat and simply sounds better than standard transformers Front Panel Front Panel Layout The front panel of the Tenor 350M amplifier is made from the finest select cherry wood lt has been hand finished with 10 coats of clear piano lacquer Over time the cherry wood will age by showing a somewhat mellow patina makine the amplifier more beautiful The same is also true of the decorative cherry rails on top of the amplifier On Off Switch There are 2 on off switches on the Tenor 350M amplifier If the rear master switch is in the on position one can power the amplifier on and off using the secondary rocker switch located below the front panel sliehtly to the right of center If the rear mas ter switch is in the off position the front switch will not function AC MAINS REMOTE 50 60 Hz 1800VA TURN ON 12 VDC Front Lens Indicator Light The lens on the front panel is an indicator light that
26. til the amplifier is com pletely clear of the sides of the travel case and positioned carefully in its final loca tion for connection to your music system List of Items Included with pair of Tenor 350M 1 Owners Manual per Pair of Amplifiers 2 Power Cords 1 In Each Travel Case 1 Hex Key per Pair of Amplifiers Package of User Accessible Fuses 2 15 Amp Mains Moving Amplifiers Each amplifier weighs 118 lbs 54kg and has the center of its weieht located roughly 2 3 towards the rear of the amplifier making it very challenging for 1 person to move comfortably The feet of the amplifier have rubber contacts that make it difficult to slide on carpet or hard surfaces so it is always recommended that the amplifier be lifted rather than dragged when moving It is also suggested that 2 people lift the amplifier from one location to another If moving the amplifier with one person place your hands 2 3 towards the back and underneath each side To protect the beautiful metal and word work it is always recommended to use the travel cases when relocating Installation Considerations The Tenor amplifier needs to be located in a clean safe and dry environment within close proximity to AC power mains Placement on the floor close to your speakers is an ideal location as long as the amplifier is not in people s way Always consider that a visitor not familiar with your room may stumble upon them if they obstruct normal pedestrian pass
27. ure your AC wiring to provide better current if this should happen but you should always consult local Elec trical Codes and seek Professional assistance Ground Hum Ground hum can occur for a number of reasons but it generally occurs when there is a difference in ground potential between one or more components in the audio chain as a result of components plugged into different power mains that have different erounding Ideally for the best sound each 350M chassis should be plugged into individual circuits and all other components should be plugged into a separate circuit but this also has the greatest potential for ground hum In the event that ground hum exists each 350M chassis through the switches shown at the right has the ability to be grounded directly grounded through a resistor or the ground is lifted entirely Experimentation will prove what selection is best and it may be different for each amplifier So do not concern one self if one chassis Audio Ground switch is different than the other 350M for the best results AUDIO GND LIFT Care and Maintenance Wood Faceplate and Top Rails The hand lacquered Wood Faceplate and Top Rails require very little maintenance Should they become marked with fingerprints a polish used for fine furniture can be used but only if applied to a soft cloth and then rubbed on the wood Spraying polish directly on the wood may contaminate the electrical components inside and coul
28. wer 2 4 80 1 2 120 1400 700 350 W S N Ratio reference to 10 W esses 94 dBA S N Ratio reference to rated 115 dBA Frequency 3 to 200 000 Hz THD N 5 20 20 enne lt 0 05 THOEN lt 0 04 THD N G 350 W eese de eee lt 0 17 IMD SMPTE 10W 100 lt 01 lt 0 02 Maximum output current 1kHz 2 Ohm 40A peak Input impedance 1kHz Bal Unbal 20 KO 33KQ Output ESES 0 08 O Damping factor eer nr a UE E REVUE 100 Qutput DO offset rv eek re WEN RR Ye ea less than 1 0 mv DC Rise time v ouvre aec vibe reo eA are vue Midis 1 15 us 10 KHz Pure class A DOWet suec uses esee eo mE EN RENE 13W Input sensitivity for 350 W 80 1 2 1 3 V Bal 1 5 V Unbal Global negative feedback Zero Main dual core power 1 875 KVA Balanced input pin 1 Gnd 2 Pos 3 Neg Input tubes vier RE
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