SUNN 300 T Amp
Contents
1. 2 a Ss she es amp Reference and Owner s Manual for the Sunn 300T Bass Amplifier 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 vision for the future that this American institution known for big sound w2. Product specifications are subject to change without notice A PRODUCT OF FENDER MUSICAL INSTRUMENTS CORP CORONA CA 91720 USA P N 053937 REVA
3. Tolex 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 grille volume and tone controls and switches ALWAYS unplug your amplifier before cleaning or approaching it with fluids SUNN 300T SPECIFICATIONS TYPE PART NUMBER POWER REQUIREMENTS PREAMP SECTION INPUT IMPEDANCE FULL POWER SENSITIVITY TONE CONTROLS GRAPHIC EQUALIZER MID NOTCH LOW BOOST HIGH BOOST COMPRESSOR CROSSOVER RATIO LINE OUT LEVEL TRANSFORMER BALANCED POWER AMPLIFIER SECTION INPUT IMPEDANCE POWER OUTPUT SENSITIVITY SPEAKER COMPLIMENT DIMENSIONS WEIGHT PR 347 21 3302 21 3332 21 3342 230V 21 3362 21 3372 100V AC 50 60 Hz 900W 120V AC 60 Hz 900W 230V AC 50 Hz 900W 240V AC 50 Hz 900W 470kQ 12mV Treble 15 dB 6kHz Bass 15 dB 40Hz 12 dB 31 5 2 63 2 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16 2 20 dB 700Hz 10 dB 40Hz 10 dB 6kHz 400Hz 1 1 Min to 4 1 Max 6dB referenced to input OdBV post 20kQ 300W R M S into 2 4 or 8Q lt 3 T H D 1V R M S OdBv Designed for use with the Sunn 410H or Sunn 215 Bass Loudspeaker Enclosures Height 10 1 in 25 7 Width 25 5in 64 8 cm Depth 15 6in 40 cm 75 lbs 34 kg SUNN is a registered trademark of Fender Musical Instruments Corporation
4. the low frequency content of both channels In its center notched position the low frequency control is flat with none of the corresponding frequencies increased or decreased K HIGH This knob adjusts the amount of increase or decrease in the high frequency content of both channels In its center notched position the high frequency control is flat with none of the corresponding frequencies increased or decreased L LOW When this push button is in it activates a low frequency boost M HIGH When this push button is in it activates high frequency boost N MID NOTCH This push button reduces the muddy mid frequency tones giving the amp a ounchy sound Utilizing the mid notch button is good for thump and pluck style playing O GRAPHIC ON OFF This button activates the Graphic EQ When the button is in the Graphic EQ is active Using the footswitch overrides the front panel channel select switch P LINE OUT This push button switch is used in conjunction with the line out jacks on the rear of the 300T When this push button is in the signal sent from the 300T is post frequency shaping channel switching and compression The line out signal does NOT include any effects which may have been added via the effects loop If the button is out the bass guitar s signal is passed through the 300T without any tone shaping or enhancement 0 GRAPHIC This 10 band graphic equalizer
5. CORP CORONA CA 91720 MADE IN U S A 4 S v4 6550C v TUBE LOCATIONS FROM LEFT RIGHT AT REAR TROUBLESHOOTER S CHECKLIST If the amp is set up but does not function check the following items e Is the power cord properly plugged into an electrical outlet Is there power at the outlet Is the instrument properly plugged into the amplifier Are the control knobs turned above 1 Is the volume control on your bass guitar turned up Is the TUNER ONLY button disengaged Is the STANDBY switch in the ON position Are any cords cut or frayed If using the effects loop is the effects unit s is properly plugged into the amplifier Is there power to your effects unit s Is the amplifier properly plugged into your speaker cabinet or enclosure o 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 FYI Attenuating low frequencies may cause the preamp to distort and this may not cause the INPUT LEVEL LED to flash red if this is the case simply turn down the CH 1 VOLUME and or CH 2 VOLUME until the distorted sound diminishes If after checking all of the above your amplifier is not performing correctly consult your nearest authorized Fender service center COVERING CARE Your 300T is covered in genuine
6. MID NOTCH buttons are out 7 Turn your amplifier ON and then the STANDBY switch on 8 Begin playing your Bass as vigorously as you would during any regular performance if necessary engage the 6dB PAD button In order to obtain the optimum signal from the preamp it is important to play with your maximum performance intensity when setting up the 300T 9 Turn the channel 1 volume control up until the INPUT LEVEL LED flashes red Next turn down the CH 1 VOLUME level until the LED flashes red occasionally this will ensure maximum output without clipping the preamp 10 Turn the MASTER VOLUME to your desired playing level 11 Next set your 300T to your desired tone settings using the compressors and graphic EQ if so desired 12 To use the graphic eq simply press the graphic ON OFF button located next to the EQ watching for the LED to illuminate You may use the EQ TRIM to match gain levels which may be affected when switching the graphic equalizer in and out 13 To use the compression circuitry simply press the COMP ON OFF button located between the COMP EQ BAL and COMP GAIN TRIM buttons 14 Be sure to check the signal level led during your tone setup to ensure you are not overdriving or clipping the preamp If the SIGNAL LEVEL LED flashes red after all tone adjustments have been made simply turn down the CH 1 VOLUME until the distorted sound diminishes 15 If at any time during your performance the 300T begin
7. R AMP PASS THROUGH This 1 4 inch unbalanced differential tip sleeve TS output jack is designed to send a preamp line level signal from your Main 300T amplifier to another amplifier This jack is used for chaining multiple 300T amplifiers together and increasing your on stage volume Do so by inserting a 1 4 cable from this POWER AMP PASS THROUGH jack into the RETURN jack in the effects loop section of another 300T NOTE You can use either a TS or TRS cord in the SEND RETURN or POWER AMP PASS THROUGH jacks G FOOTSWITCH Plug in connection for the footswitch P N 053895 used to remotely turn on and off the graphic equalizer compressors and change the channel selection Using the footswitch will override the front panel graphic equalizer compressor and the channel selection buttons NOTE Any good quality patch cord will work with the remote footswitch however an unshielded speaker type cord is preferable to a coax guitar cord footswitch graphic ch select H CH SELECT Allows the remote ON OFF switching of the Channel 1 2 mix GRAPHIC Allows the remote ON OFF switching of the Graphic EQ J COMP Allows the remote ON OFF switching of the compression circuitry SUNN REAR PANEL CONT sunn Sige 89 40 20 K LINE OUT These transformer balanced XLR male and 1 4 inch tip ring sleeve line level output jacks are designed to
8. as built upon SUNN STAGE GEAR Attitude Power and Performance for Professionals SUNN 300T BASS AMPLIFIER VACUUM TUBE DESIGN IN BOTH THE PREAMP AND POWER AMPLIFIER CONSTRUCTED IN AN ALL STEEL CHASSIS FOR ENDURING RELIABILITY 300 WATTS OF POWER TWO CHANNELS WITH CLEAN AND DISTORTION MODES TRANSFORMER BALANCED LINE OUT WITH SPEAKER EMULATION FOOTSWITCH J ACK FOR REMOTE ON OFF SWITCHING OF THE GRAPHIC EQUALIZER COMPRESSOR AND CHANNEL SELECTION LOW NOISE DIFFERENTIAL EFFECTS LOOP FOR SIGNAL PROCESSING DEVICES SPLIT BAND COMPRESSOR Congratulations on your purchase of a Sunn 300T Bass Amplifier Built with care and special attention to detail your new Sunn 300T Bass Amplifier offers much more than meets the eye Each 300T bass amplifier is crafted from the finest components available and assembled at the Sunn amplifier factory in Corona California USA The Sunn 300T Bass Amplifier includes among its many features 300 Watts of power into 2 4 or 8Q active compression circuitry and a 10 band graphic equalizer and high and low frequency controls for full bodied tonal shaping The two channels are voiced for both clean and distortion outputs offering the versatility of differing playing styles The footswitch Circuitry allows for remote selection of the front panel graphic equalizer compressor and the channel selection Moreover the rear panel features an effects loop for the addition of external signal
9. consists of active band pass band reject filters spaced at octave intervals Moving the sliders up or down boosts or cuts the gain at the indicated frequency The EQ Trim slider provides an increase or decrease of the bass signal through the graphic EQ When the slider is at its centered notched position the input signal is neither boosted or cut R GRAPHIC EQ LED This LED illuminates when the Graphic EQ is active S LOW COMP This knob adjusts the compression ratio below 400Hz Rotating the knob clockwise increases the compression ratio T COMP This push button switch is used to activate the on board compressors When this push button is in compressors are active Using the footswitch overrides the front panel channel select switch U HIGH COMP This knob adjusts the compression ratio above 400Hz Rotating the knob clockwise increases the compression ratio V COMP LED This LED illuminates when the compression circuitry is active W COMP EQ BAL This detented knob mixes the low and high compressor outputs When the knob is at 1 only the low compressor is in the output mix When the knob is at 10 the high compressor is in the output mix By rotating the knob an optimum mix of both compressors can be obtained X INPUT LEVEL LED This LED illuminates GREEN once the threshold of the compressor has been reached When a RED light is displayed this indicates clipping and your 300T is being overdrive
10. d DO WAIT FOR TUBE FAILURE TO REPLACE TUBES See Tube Replacement Section page 11 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 First replace the OUTPUT tubes the amplifier re bias and listen Next re insert the original output tubes and re bias Replace the PRE AMP tubes and listen Finally try replacing both the OUTPUT re bias 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 300T s tube compliment consists of One 12AT7A Tube part 023531 tube location V4 Three 12AX7WA Tubes part 013341 tube locations V1 thru V3 Six 6550C Tubes part 048489 tube locations V5 thru V10 MODEL SUNN 300T FENDER MUSICAL INSTRUMENTS
11. fects 0070 ower am cass fnrough 1 return gt send A POWER Turns the AC power ON and OFF When the rocker switch is down the amplifier is OFF and completely shut down B LINE CORD The 300T 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 The line cord should be connected to a suitable power source in accordance with voltage and frequency as shown in the power rating on the rear panel DO NOT ALTER THE AC PLUG C FUSE The fuse is in the AC supply of the amplifier and will help to protect the amplifier in the event of an electrical fault If a fuse blows replace it only with 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 D SEND This 1 4 inch unbalanced differential tip sleeve TS output jack is designed to send a signal to an external signal processing device such as a digital delay or a chorus unit E RETURN This 1 4 inch balanced tip ring sleeve TRS input jack is designed to accept signal from an external processing device such as a digital delay or a chorus unit F POWE
12. feed the 300 5 signal to external power amplifier or main house mixer The signal from these output jacks include all effects and tone shaping done by the 300T The output of this jack also includes a speaker emulation circuit L TUNER OUT This 1 4 inch unbalanced TS output jack is designed to send your bass guitar s signal to your tuning device not included M SPEAKER 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 300T being damaged by using an improper impedance load A PRODUCT OF FENDER MUSICAL INSTRUMENTS CORP CORONA CA 91720 MADE IN U S A speaker Fedance main speaker external speaker N 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 300 5 power and standby switches in their on positions make sure a load of at least 2Q is present Failure to do so may result in your 300 being damaged by using an improper impedance load As a rule of thumb ALWAYS connect or disconnect any speaker enclosure to your 300T with the power off O 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
13. in conjunction with the main speaker jack If this jack is used without the main speaker jack no sound will be produced Speaker Cabinets 1 4Q Cabinet 2 4Q Cabinets 300T OUTPUT TUBE BIAS INDICATORS AND CONTROLS replace with T100mA fuse only P TUBE TROUBLE This LED indicates tube failure or trouble at the tube s respective location When the LED glows green the tubes are operating properly When the LED glows red this indicates a tube failure which has blown the fuse at the respective fuse location on the top surface of the chassis NOTE It is normal for the LEDs to glow RED when the amp is in STANDBY mode If a fuse blows replace it only with 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 their respective locations check and adjust the bias and balance If the amplifier repeatedly blows fuses it should be taken to an authorized Fender service center 1 _ 24 balance OV bias 100 mV Q BIAS This trim adjustment is used in conjunction with the BALANCE and the bias test points to set the output tube bias R BIAS 100mV amp BALANCE OV These are bias test points used to measure output tube bias and balance with a digital voltmeter S BALANCE This trim adjustment is used in conjunction with the bias test points and the BIAS adjustment to set the bias bala
14. n When the compression circuitry is not engaged the LED will still indicate signal level Y COMP GAIN TRIM This knob adds gain to make up for any level lost once the compression circuitry has been engaged Rotating the knob clockwise increases the amount of gain Z TUNER ONLY This push button mutes all outputs and sends your bass guitar s signal to your tuning device not included AA MASTER VOLUME This knob adjusts the overall volume level of the 300T Rotating the knob clockwise increases volume with 1 producing no volume and 10 producing maximum volume BB POWER LED This LED illuminates when the 300T is ON and receiving power CC 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 SUNN 300T REAR PANEL CAUTION SURFACE rebuce THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN MOISTURE AVIS risque ELECTRIQUE NE PAS OUVRIR ATTENTION superricie DE CHASSIS CHAUDE INPUT POWER 120V 60Hz 900W Yon FUSE ATTENTION UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE ET CALIBRE B PRENC TO REDUCE THE RISK OF FIRE REPLACE FUSE WITH SAME TYPE AND RATING ef
15. nce between the power amp tube sections of your 300T 10 65500 WE 5 replace with T100mA fuse only Output Tube Bias Adjustment Instructions 1 Turn on your 300T and let it warm up for at least two minutes with the STANDBY switch in the ON position Make sure the amplifier is properly connected to a speaker 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 BIAS 100mV test points test points 1 amp 2 and adjust the BIAS control for a reading of 1 VDC 100 4 Next connect the digital voltmeter to the BALANCE OV test points test points 2 amp 3 and adjust the BALANCE control for a reading of 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 balance take your amp to the nearest authorized Fender Service Center 2 For optimum sonic performance set bias to 100mVDC then set balance 3 If the output tubes can not be biased to at least 80mVDC replace the 6550C output tubes 4 If the output tubes can not be balanced check the bias setting and or replace the 6550C output tubes 5 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 LEDs turn RED only after tube failure has already occurre
16. processing devices or outboard gear an impedance switch for different speaker cabinet loads a tuner out jack for accessing your tuner and both XLR and 1 4 inch line out jacks and a pass through jack for routing your bass signal to another amplifier or mixing console In order to thoroughly understand the operation features and functions of your new Sunn 300T Bass 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 Take the time to get to know each other Tune up Plug in and Play On 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 ALLOW AT LEAST 3 INCHES 7 6 CM IN THE FRONT AND REAR OF THE UNIT FOR PROPER VENTILATION DO NOT BLOCK VENTS THIS UNIT MUST BE EARTH GROUNDED SUNN 300T SETUP PROCEDURES To ensure optimum performance from your Sunn 300T Bass Amplifier please follow these setup guidelines and procedures E FX 1000 Signal Processor From Effects Loop Send to Effects Processor In From Effects Processor to Effects Loop Return 120 2 60 2 effects ower 900 loo pass through 0 return From Power Amp Pass Through to Effects Loop Return on another amp From Footswitch Out J ack to Foot
17. s to distort without the CH SELECT switch engaged simply turn down CH 1 VOLUME until the distorted sound diminishes SUNN 300T FRONT CONTROL PANEL A INPUT Plug your bass guitar in here B 6 dB PAD Sensitivity gain switch for the input signal When this button is in it provides a 6dB attenuation useful for reducing input levels on bass guitars with active pickups or high level outputs C CH 1 VOLUME This knob adjusts the overall loudness of channel 1 D CH 1 LED This LED illuminates when the channel 1 is active E CH 2 GAIN This knob adjusts the amount of gain or distortion in Channel 2 F CH 1 2 MIX LED This LED illuminates when the CH SELECT button has been pressed indicating the Ch 1 Ch 2 mix is active G CH 2 VOLUME This knob adjusts the overall loudness of channel 2 H CH SELECT This push button selects Channel 1 2 mix When this button is in both Channel 1 and Channel 2 are active This button is used in conjunction with the CH 1 2 MIX knob item 1 Using the footswitch overrides the front panel channel select switch CH 1 2 MIX This knob mixes the channel 1 and channel 2 output levels When the knob is at 1 only channel 1 is in the output mix When the knob is at 10 only channel 2 is in the output mix By rotating the knob an optimum mix of both channels may be obtained po pre J LOW This knob adjusts the amount of increase or decrease in
18. switch EDF ch select graphic 1 Connect your Sunn 410H Sunn 215 Bass Loudspeaker Enclosure or equivalent to the parallel speaker jacks located on the rear of the 300T amplifier Note For improved performance DO NOT daisy chain multiple enclosures off the same jack As a rule of thumb connect only one speaker enclosure per output jack and remember the total minimum impedance load for the 300 is 20 Remember to connect or disconnect any speaker enclosure to your 300 with the power off 2 Set the SPEAKER IMPEDANCE switch to match the power amp to the proper speaker impedance load item M page 9 From Line Out to External Power Amp or Mixer tf From Tuner Out to Tuning Device From Speaker J acks to Speaker Cabinets 3 Next attach the 3 button footswitch and your tuner to the TUNER OUT and FOOTSWITCH jacks located on the rear of the amplifier 4 Connect any effects processing devices through the EFFECTS LOOP SEND and RETURN jacks on the rear of the unit 5 If sending your 300 5 signal to an external power amplifier or main house mixer connect a cord from either the 1 4 inch or XLR LINE OUT jack to your external power amplifier or mixer 6 Make sure the HIGH and LOW tone controls in their center notched positions the Graphic EQ is flat the compressors are OFF and the LOW HIGH and
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