Reference and Owner`s Manual for the Sunn Model T Guitar Amplifier
Contents
1. IOI I I Fe D oe a_i aom ma SS e e unto oe eee So a eo za rE PrrrriiLi Reference and Owner s Manual for the Sunn Model T Guitar Amplifier amp The SUNN Legacy In early 1963 a band from Oregon called The Kingsmen hit the charts with a catchy little tune called Louie Louie The Kingsmen quickly became household names and Louie Louie the rock anthem of the decade With a hit single under their belt The Kingsmen soon found themselves embarking on a 50 state national tour One of the first things bassist Norm Sundholm discovered was that his bass amp while fine for hops and school dances did not have the power necessary for the larger concert halls to which the band had ascended To solve this dilemma Norm enlisted the help of his brother Conrad and by 1964 the brothers Sundholm had designed the world s first high powered concert bass amplifier 1965 saw the demand for the Sundholms amplifiers increase to the point that the family garage would no longer serve as a Suitable manufacturing facility Thus the SUNN Musical Equipment Company was born As the years passed countless pioneers of rock would rely on SUNN amplifiers to carry the weight The Who Moody Blues Cream Steppenwolf Kiss Rush Queen and a little music festival in up state New York all endorsed SUNN equipment Today your new SUNN amplifier embodies this rich tradition and combines it with a vi2. H i ti ae OOO From Model T SEND to your effects unit input From your effects unit output to your Model T RETURN E FX 1000 Signal Processor 5 Connect your effects unit to the Model T effects loop see illustration above 6 Next engage the loop by pressing the effects loop button in item H page 6 balance main ext A ampout ampin footswitch 7 Turn the Channel 1 send control item E page 6 clockwise until the desired amount of signal is sent to your effects device Avoid very high settings of the send control as this could clip the input of your effects device 8 Carefully adjust the Channel 1 Return control item J page 6 until the amplifiers volume is matched when the effects loop is engaged or bypassed 9 Repeat this procedure for the Channel 2 effects loop 10 Re connect the footswitch IMPORTANT 1 If your effects device is distorting or clipping reduce the send control until the distortion stops Next increase the return control to match the amplifier s volume when the effects loop Mae is engaged or bypassed 2 If you are unable to match the ETY a volume levels make sure the input level and or the output level controls are set properly on your effects device xir line out MODEL T REAR PANEL FUNCTIONS CON T bias balance MO S V9 V10 3S L V7 amp V9 TROUBLE This LED indicates tube failure or trouble at the V7 or V9 tube locations When the L
3. as this could damage the equipment and present a serious safety hazard Next replace the tubes in locations V8 amp V10 check and adjust the bias and balance If the amplifier repeatedly blows fuses it should be taken to an authorized Fender service center balance V8 amp V10 trouble Output Tube Bias Adjustment Instructions 1 Turn on your Model T and let it warm up for at least two minutes with the STANDBY switch item M page 5 in the ON position and the ARENA CLUB item D page 6 switch in the Arena position 2 Remove the bias controls cover box 3 With a digital voltmeter set to its most sensitive DC voltage scale measure the voltage between the GND and V7 V8 test points items N and adjust the BIAS control item M for a reading of 06 VDC 60 mVDC 4 Connect the digital voltmeter to the V7 V8 and V9 V10 test points and adjust the BALANCE control item O for 0 VDC 5 Replace the bias controls cover box Notes 1 Make bias and balance adjustments ONLY when necessary If you are unsure about setting bias and balance take your amp to the nearest authorized Fender Service Center 2 For optimum sonic performance set bias to 06 VDC then set balance 3 If the output tubes can not be balanced check the bias setting and or replace the 6L6GC output tubes 4 The power tube trouble LEDs are NOT indicators of worn tubes If your tubes are worn and sound weak the LEDs may still glow green The trouble L
4. ED glows green the tubes are operating properly When the LED glows red this indicates a tube failure which has blown the V7 V9 fuse located on the top surface of the chassis If this fuse blows replace it only with one of the same type and rating NEVER use a fuse with a higher current rating as this could damage the equipment and present a serious safety hazard Next replace the tubes in locations V7 amp V9 check and adjust the bias and balance If the amplifier repeatedly blows fuses it should be taken to an authorized Fender service center V7 amp V9 Gs M BIAS This trim adjustment is used in conjunction with the BALANCE item O and the bias test points items N to set the output tube bias N GND V7 amp V8 V9 amp V10 These are bias test points used to measure output tube bias and balance with a digital voltmeter O BALANCE This trim adjustment is used in conjunction with the bias test points items N and the bias adjustment item M to set the bias balance between the power amp tube sections of your Model T P V8 amp V10 TROUBLE This LED indicates tube failure or trouble at the V8 or V10 tube locations When the LED glows green the tubes are operating properly When the LED glows red this indicates a tube failure which has blown the V8 V10 fuse located on the top surface of the chassis If this fuse blows replace it only with one of the same type and rating NEVER usea fuse with a higher current rating
5. EDs turn Red only after tube failure has already occurred DO NOT WAIT FOR TUBE FAILURE TO REPLACE TUBES See Tube Replacement Section page 11 MODEL T REAR PANEL FUNCTIONS CON T gnd V7 V8 V9 V10 balance main ext amp out__amp in KORO lt S N O Q MAIN AMP OUT This 1 4 inch unbalanced TS output jack is designed to send a preamp line level signal from your Main Model T amplifier to another Model T amplifier This jack is used for chaining multiple Model T amplifiers together and increasing your on stage volume Do so by inserting a 1 4 cable from the MAIN AMP OUT jack into another Model T s EXT AMP IN jack R EXT AMP IN This 1 4 inch unbalanced TS input jack is designed to receive a preamp line level signal from another Model T amplifier This jack is used for chaining multiple Model T amplifiers together and increasing your on stage volume S FOOTSWITCH INCLUDED Plug in connection for the footswitch The footswitch allows the remote On Off selection of the EFFECTS LOOP and switching of the two channels Using the footswitch overrides the rear panel effects loop switch and the front panel channel select switch T PN main spkr spkr 00 o _ xlr ext line out 69 8QO 40 ee TIN load impedance CAUTION CHASSIS SURFACE T XLR LINE OUT This balanced XLR male line level output is designed to feed the Model T s signal to an external power ampli
6. fier or main house mixer U EXTERNAL SPEAKER JACK Plug in connection for an additional speaker enclosure This jack is wired in parallel with the main speaker jack and must ONLY be used in conjunction with the main speaker jack If this jack is used without the main speaker jack no sound will be produced V MAIN SPEAKER J ACK This is the main plug in connection for your speaker enclosure and should always be used as the primary connection If your ModelT is in the on and ready to play position make sure a load of at least 4Q is present Failure to do so may result in your Model T being damaged by using an improper impedance load As a rule of thumb ALWAYS connect or disconnect any speaker enclosure to your Model T with the power off W LOAD IMPEDANCE This switch allows the selection of different impedance loads for your loudspeaker enclosure s Make sure to match the total speakers load impedance to the load impedance selector switch setting Failure to do so may result in your Model T being damaged by using an improper impedance load Speaker Cabinets 1 16Q Cabinet 2 16Q Cabinets 1 8Q Cabinet 2 8Q Cabinets STADIUM SET UP MAIN AMPLIFIER model T sun From MAIN AMP OUT From MAIN SPKR out to Cabinet From EXT SPKR out to Cabinet EXTENSION AMPLIFIER To EXT AMP IN model T sunt O From MAIN AMP OUT From MAIN SPKR out to Cabinet From EXT SPKR out to Cabinet To EXT AMP IN ey ar e
7. he original output tubes and re bias Replace the PRE AMP tubes and listen e Finally try replacing both the OUTPUT re bias and PRE AMP tubes and listen If there is a marked improvement in the tone of your amp at any point in this procedure leave the new tubes in your amp and purchase another spare set Your Model T s tube compliment consists of e Four 6L6GC Tubes part 053980 Two 12AX7A Tubes part 023572 tube locations V1 and V2 e Four 12AX7WA Tubes part 013341 tube locations V3 V4 V5 and V6 vi 12AX7A output transfor 026478 V6 12AX7A 11 TROUBLESHOOTER S CHECKLIST If the amp is set up but does not function check the following items e Is the amp power cord properly plugged into an electrical outlet e Is there power to the outlet e Is the fuse blown Is the speaker s properly connected to the amplifier e Is the amp on standby e Are the amplifier VOLUME TREBLE MID and BASS controls above 1 e Is the instrument volume control turned up e Is the instrument plugged into the amplifier Eliminate any effects pedals disconnect any effect devices from the effects loop and try another guitar cord Check under all tube covers to see if the tube filaments are glowing If after checking all of the above your amplifier is not performing correctly consult your nearest authorized Fender service center COVERING CARE Your Model T is covered in genuine Tole
8. ition the main amp out and extension amp in jacks on the rear panel allow chaining multiple Model T units together Designed for the most discriminating guitarist the Model T produces tones ranging from sparkly clean to pure unadulterated distortion In order to thoroughly understand the operation features and functions of your new Sunn Model T Tube Amplifier please read and refer as needed to this operation manual By doing so your amplifier is sure to provide you with years of trouble free music making and maximum playing enjoyment WARNING TO PREVENT DAMAGE FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ONLY THIS UNIT MUST BE EARTH GROUNDED MODEL T FRONT PANEL FUNCTIONS treble bass volume A IN Plug your guitar in here B VOLUME Adjusts the volume level of Channel 1 C TREBLE Adjusts the amount of increase or decrease in the high frequency content of Channel 1 D BASS Adjusts the amount of increase or decrease in the low frequency content of Channel 1 E MIDDLE Adjusts the amount of increase or decrease in the mid frequency content of Channel 1 F GAIN Adjusts the amount of gain or distortion in Channel 2 middle G TREBLE Adjusts the amount of increase or decrease in the high frequency content of Channel 2 H BASS Adjusts the amount of increase or decrease in the low frequenc
9. otect the amplifier in the event of an electrical fault If a fuse blows replace it only with one of the same type and rating Refer to the specification page to determine the correct fuse type and rating for your amplifier NEVER use a fuse with a higher current rating as this could damage the equipment and present a serious safety hazard If the amplifier repeatedly blows fuses it should be taken to an authorized Fender service center C LINE CORD The Model T is equipped with a grounding type IEC supply cord to reduce the possibility of shock hazard Be sure to connect it to a grounded AC receptacle DO NOT ALTER THE AC PLUG INPUT POWER ARSE A Gna DO NOT OPEN 360W D ARENA CLUB Switches the output power of your Model T between 100W and 25W operation When the switch is in the arena position the amplifiers output is at 100W useful for larger venues When the switch is in the club position the amplifier s output is at 25W ch 1 O return Di NE engage E bypass E CH 1 SEND This knob adjusts the channel 1 send level for the effects loop Rotating the knob clockwise increases the amount of signal sent to your effects unit F CH 2 SEND This knob adjusts the channel 2 send level for the effects loop Rotating the knob clockwise increases the amount of signal sent to your effects unit G SEND This 1 4 inch unbalanced TS output jack is designed to send a signal to an external signal proce
10. sion for the future that this American institution known for big sound was built upon SUNN STAGE GEAR Attitude Power and Performance for Professionals lO circa 1973 SUNN ALL TUBE AMPLIFIERS ALL TUBE PREAMP AND POWER AMP GENERATE THAT TONE AS ONLY TUBES CAN MAGNETIC INTERFERENCE REDUCING CHASSIS ELIMINATES UNWANTED NOISE AND RADIO INTERFERENCE ROAD WORTHY AND MUSICAL COMPONENTS CAPABLE OF HANDLING THE MOST DEMANDING PERFORMANCE SITUATIONS CONSTRUCTED FROM HAND SELECTED WOODS EMPLOYING RUGGED CORNER J OINERY FOR ENDURING RELIABILITY COVERED IN GENUINE TOLEX FOR LONG LIFE AND LASTING GOOD LOOKS Congratulations on your purchase of a Sunn Model T Tube Amplifier Built with care and special attention to detail your new Sunn Model T offers much more than meets the eye Each Model T is crafted from the finest components available and assembled at the Sunn amplifier factory in Corona California USA The All Tube Model T features a 2 channel switchable preamp with individual tone controls and an Arena Club switch allowing the selection between 100 watt or 25 watt power output The footswitch offers the ability to remotely switch on and off the effects loop and to select between the two preamp channels Also with the built in effects loop adding external Signal processing gear is a snap The effects loop is an all tube series type with separate send and return controls for each channel In add
11. ssing device such as a digital delay or a chorus unit H LOOP This push push button is the On Off switch for the effects loop circuit When this button is pressed the effects loop is engaged and the guitar amp s signal is routed to your effects unit Note Using the footswitch overrides the Loop bypass button RETURN This 1 4 inch unbalanced TS input jack is designed to accept signal from an external processing device such as a digital delay or a chorus unit The effects loop will not operate without a plug inserted into this jack J CH 1 RETURN This knob adjusts the channel 1 return level for the effects loop Rotating the knob clockwise increases the amount of signal returned to your Model T amplifier from your effects unit K CH 2 RETURN This knob adjusts the channel 2 return level for the effects loop Rotating the knob clockwise increases the amount of signal returned to your Model T amplifier from your effects unit EFFECTS LOOP OPERATION INSTRUCTIONS 1 Adjust both channel s front panel controls to the desired volume and tone settings 2 Turn all effects loop controls on the rear panel to 1 I engage bypass 3 Disconnect the footswitch from the amplifier and place the channel select button on the front panel to the Channel 1 setting item K page 5 4 Place the effects loop button located on the rear panel item H page 6 in the Bypass position A fe a Lv bias Q 2 ch
12. t main Meout spk Spie haal L GEET TO E From MAIN AMP OUT From MAIN SPKR out to Cabinet From EXT SPKR out to Cabinet 910 010 OOJOOE i20 Q0 ILOIOOJ OOOO OOOO To EXT AMP IN etc 1 To chain multiple Model T amplifiers together 2 Remember tone and volume settings of the main simply connect a guitar cord from the MAIN AMP head control the tone and volume of all the Model OUT jack on the rear of your main Model T to the EXT T s in your setup regardless of the extension head AMP IN on the next Model T Repeat this procedure settings The presence controls however are still for as many amps as you care to chain together active on each Model T amplifier 10 TUBE REPLACEMENT Tube life varies depending upon playing style and application Power tubes have a much shorter life than pre amp tubes which can last for years For continued optimum performance from your amplifier the tubes should ONLY be replaced with the same type tubes as specified on the tube illustration below A simple way to check if the tubes are worn is to replace the set in your amp with your spare set You do carry spare tubes and fuses don t you When changing the tubes ALWAYS unplug the amplifier and remember THE TUBES ARE HOT Either wait for the tubes to cool or use an insulated oven mitt to remove them from your amplifier e First replace the OUTPUT tubes in the amplifier re bias and listen e Next re insert t
13. x for long life and lasting good looks To clean the Tolex covering use a sponge and a light soapy water solution Avoid spilling liquids on the operating surfaces grill volume and tone controls and switches ALWAYS unplug your amplifier before cleaning or approaching it with fluids MODEL T SPECIFICATIONS TYPE PART NUMBER POWER REQUIREMENTS POWER OUTPUT INPUT IMPEDANCE TUBES FUSE SPEAKER FOOTSWITCH DIMENSIONS Height Width Depth WEIGHT PR 344 021 3373 100V 021 3303 120V 021 3343 230V UK 021 3363 230V Eur 021 3333 240V Aust 100V AC 50 60 Hz 360W 120V AC 60 Hz 360W 230V AC 50 Hz 360W 240V AC 50 Hz 360W 120W R M S Arena 29W R M S Club 1kHz sine into 8Q 5 T H D Presence 1 1MQ Four 6L6GC Tubes part 053980 Two 12AX7A Tubes part 023572 Four 12AX7WA Tubes part 013341 T4A 250V fuse for 100V and 120V versions T2A 250V fuse for 230V and 240V versions Designed for use with Sunn 412 Loudspeaker Enclosures 2 Button Footswitch P N 053584 Controls Channel and Effects Loop Select 10 2 in 25 9 cm 24 5in 62 2 cm 11 6 in 29 5 cm 45 lbs 20 4 kg Fender and Sunn are registered trademarks of the Fender Musical Instruments Corporation PRODUCT SPECIFICATIONS ARE SUBJ ECT TO CHANGE WITHOUT NOTICE A Product of Fender Musical Instruments Corporation Corona CA 91720 USA P N 051436 REV A
14. y content of Channel 2 MIDDLE Adjusts the amount of increase or decrease in the mid frequency content of Channel 2 J VOLUME Adjusts the volume level of Channel 2 volume middle presence K CHANNEL SELECT LED This LED Does Not illuminate when Channel 1 is active When this LED illuminates RED Channel 2 is active CH SELECT This push push button switches between Channel 1 and Channel 2 When this button is in Channel 2 is active Using the footswitch included overrides the channel select switch L PRESENCE Adjusts the high frequency response of the amplifier Rotating this knob clockwise enhances the upper highs giving the Model T a slightly crisper tone M STANDBY When the power switch and this switch are ON your Model T is ready to perform In the STANDBY position power is supplied ONLY to the tube filaments and sound will NOT come out of the amp Using the STANDBY SWITCH during short breaks eliminates tube warm up time and will increase tube life N PILOT LIGHT This pilot jewel illuminates when the ModelT is receiving power Should this bulb burn out turn off and unplug the amplifier unscrew the pilot jewel and replace the lamp with a type T47 bulb MODEL T REAR PANEL FUNCTIONS A POWER SWITCH Turns the AC power ON and OFF When the switch is in the OFF position the amplifier is completely shut down B FUSE The fuse is in the AC supply of the amplifier and will help to pr
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