Fender Bassman 300 User manual

BASSMAN 300
p/n 021-3302-010 (120V)
SERVICE MANUAL
CONTENTS:
Notices
Specifications
Circuit description
Parts lists:
PCB assembly
Chassis assembly
Cabinet assembly
End item
Footswitch assembly
Footswitch PCB
Schematics
Service diagrams
Fender Musical Instruments Corp. 8860 East Chaparral Road Suite 100 Scottsdale, AZ 85250

BASSMAN 300
(This is the model name for warranty claims)
SERVICE MANUAL
December 2002
IMPORTANT NOTICE:
The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Co. It is
disclosed solely for use by qualified technicians for purposes of equipment maintenance and service. It is not to be
disclosed to others without the expressed permission of Fender Musical Instruments Co. All specifications subject to
change without notice.
For warranty repair service, only Fender specified part numbers are to be used. It is recommended they also be used
for post-warranty maintenance and repair.
Parts marked with an asterisk (*) indicate the required use of that specific part. This is necessary for RELIABILITY
and SAFETY requirements. DO NOT USE A SUBSTITUTE!
A coded naming convention is used in the description of certain parts. The codes and what they mean are as follows:
CAPACITOR CODES HARDWARE CODES
CAP AE =Aluminum Electrolytic BLX =Black Oxide
CAP CA =Ceramic Axial CR =Chrome Plated
CAP CD =Ceramic Disk HWH =Hex Washer Head
CAP MPF =Metalized Polyester Film M=Machine Screw
CAP MY =Mylar NI =Nickel Plated
CAP PFF =Polyester Film/Foil OHP =Oval Head Phillips
PB =Particle Board
RESISTOR CODES PHP =Pan Head Phillips
PHPS =Pan Head Phillips Sems
RES CC =Carbon Comp SMA =Sheet Metal "A" Point
RES CF =Carbon Film SMB =Sheet Metal "B" Point
RES FP =Flame Proof SS =Stainless Steel
RES MF =Metal Film TF =Thread Forming
RES WW =Wire Wound ZI =Zinc Plated

BASSMAN 300
(This is the model name for warranty claims)
SPECIFICATIONS
Product Release No.: PR 512 (This is not a model number)
Part Number: 120V Version : 21-3302010
240V Aust : 21-3332010
230V UK : 21-3342010
230V : 21-3362010
100V JPN : 21-3372010
220V ROK : 21-3392010
110V TW : 21-3312010
230V ARG : 21-3352010
Power Requirements: All Versions : 900W
Preamp Section
Input impedance: 470 kΩ
Full power sensitivity: 12 mV
Tone controls: Treble: +/- 15 dB @ 6kHz
Bass: +/- 15 dB @ 40Hz
Graphic equalizer: +/- 12 dB @ 31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz,
4kHz, 8kHz, 16kHz
Mid notch: -20 dB @ 700Hz
Low boost: +10 dB @ 40Hz
High boost: +10 dB @ 6kHz
Compressor
Crossover: 400Hz
Ratio: 1:1 min to 4:1 max
Line out level: +6 dB referenced to input (pre), 0 dBV (post)
(Transformer balanced)
Power amplifier section
Input impedance: 20 kΩ
Power output: 300 Watts RMS into 2, 4, 0r 8Ω@ <3% THD
Sensitivity: 1V RMS (0dBV)
Speaker Complement: Designed for use with the Bassman 410H or Bassman 215 Bass
Loudspeaker Enclosures
Dimensions: Height: 10.1" (25.7 cm)
Width: 25.5" (64.8 cm)
Depth: 15.6" (40 cm)
Weight: 75 lbs. (34 kg)
Product specifications are subject to change without notice

BASSMAN 300
(This is the model name for warranty claims)
CIRCUIT DESCRIPTION
Preamp
The preamp section employs two 12AX7 tubes. Channel one (V1) is fairly conventional, while channel two (V2) uses
a second tube with additional op-amp gain (U2B) to provide a 60's style overdrive sound. The op-amp is used as
straight gain and is never allowed to become non-linear.
In typical operation, the drive channel and the clean channel are presented to the channel 1/2 mix control (R17) so
that a "blend" can be established. The channel select button (S9) on the front panel (or it's foot switch counterpart)
selects between this channel mix or channel one only. This selection employs JFETS Q1-Q4.
Signals are then presented to a second - order Sallen and Key filter set to F0 of 36.6 Hz and a Q of 2.1. This filter
provides about 6.5dB of boost at 41 Hz.
The signal path is routed to U17B where low-boost (S3) , mid-notch (S2), and high-boost (S4) equalization switches
can be used. These circuits are followed by conventional Baxendall low (R58) and high (R62) equalization. The
Baxendall circuit output is then sent to a graphic equalizer which can be selected by the footswitch or graphic EQ
button (S7) on the front panel. The far-right graphic EQ slider (R71) is a +/- 10dB trim for graphic EQ gain
compensation.
Next, the signal is presented to a second-order state-variable filter before being presented to the compressor circuit.
Said filter is set to 420 Hz. At the compressor, low-frequency compression ratio (R100) and high-frequency
compression ratio (R119) are adjustable to suit the user. Audio is presented to the "compressor EQ balance" (R102).
The compressor EQ balance controls the mix ratios of the compressor outputs. A compressor gain trim (R80) is
provided to compensate for the amount of amplification lost due to using the compressor. The compressor-gain trim
control is able to compensate for a compressed signal of up to 10dB.
The FETs Q5 and Q6 select between pre- and post-compressor via the front panel switch (S8) or footswitch. After
passing through op-amp U9B and master-gain control R107, the signal is sent to output jack J2, effects-loop send.
The signal input at J3, effects-loop return, goes to differential receiver U11A.
Heater voltage (24VDC for 2 series-connected 12AX7s in the preamp) is derived from the 32VDC supply
(+/-16VDC).. Excess voltage is dropped across across paralleled ballast resistors, R354-R356, on the preamp PCB.

BASSMAN 300
(This is the model name for warranty claims)
CIRCUIT DESCRIPTION (CONT)
Output section
On the top side of the chassis, at the rear of each pair (total = 3) of output tubes, is an LED and a fuse. The LED glows green
when the associated pair of tubes is operating properly, and glows red if a tube failure has caused the related fuse to blow. If a
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 their respective locations, check and
adjust the bias and balance.
NOTE: it is normal for the LEDs to glow red when the amp is in standby mode.
Output tube bias adjustment instructions
1. Turn on the 300T and let it warm up for at least two minutes with the STANDBY switch in the ON position. Make sure the
amplifier is connected to a speaker or equivalent load.
2. Remove the bias controls cover box.
3. With a DVM set to it's most sensitive DC voltage scale, measure the voltage between the BIAS 100mV test points, and
adjust the BIAS control for a reading of .1 VDC (100mVDC)..
4. Next, connect the DVM to the BALANCE 0V test points, and adjust the BALANCE control for a reading of 0 VDC.
5. Replace the bias controls cover box.
NOTES:
1. For optimum sonic performance, set bias to 100 mVDC first, then set balance.
2. If the output tubes cannot be biased to at least 80 mVDC, replace the 6550C output tubes.
3. If the output tubes cannot be balanced, check the bias setting and/or replace the 6550C output tubes.
4. If the power tube trouble LEDs are glowing green, it does not indicate that the tubes are not worn or weak.
Tube layout:

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
4054360 CAP AE AX 22uF 450V 20% 105C C162 C166 C170 C176
2054361 CAP AE AX 47uF 450V 20% 105C C156 C159
4033606 CAP AE RDL .47uF 50V 20% C102 C126 C127 C130
2054355 CAP AE RDL 1000uF 50V 20% 105C C174-175
8028463 CAP AE RDL 10uF 50V 20% C41 C78 C81 C85 C88 C113 C178-179
1028458 CAP AE RDL 1uF 50V 20% C82
4028459 CAP AE RDL 2.2uF 50V 20% C27 C109 C112 C120
36 028467 CAP AE RDL 22uF 50V 20% C16 C19-20 C31 C33-34 C36 C38-39
C45
C48 C51 C54 C57 C61 C64 C67 C70
C73-74 C80 C84 C86 C103 C107-108
C111 C115 C117 C124 C128 C144
C145 C147 C149-150
3054356 CAP AE RDL 330uF 450V 20% 105C C171-173
4028460 CAP AE RDL 4.7uF 50V 20% C2 C11 C12 C26
1038699 CAP CA 100pF 100V 5% C37
2039265 CAP CA 2200pF 100V 5% C79 C110
7039259 CAP CA 220pF 100V 5% C8 C40 C104-106 C114 C116
5038873 CAP CA 22pF 100V 5% C6 C15 C42 C59 C83
1039261 CAP CA 330pF 100V 5% C142
2038701 CAP CA 470pF 50V 5% C77 C163
2039256 CAP CA 68pF 100V 5% C118 C119
25 034788 CAP CD .1uF 50V 20% .15" cut C4-5 C89-100 C121 C140-141 C146
C148
C151-155 C169
3025995 CAP CD 8200pF 1000V 20% LL C167-168 C177
1027256 CAP MPF .0015uF 100V 10% C30
3027260 CAP MPF .0039uF 100V 10% C123 C125 C129
2027264 CAP MPF .01uF 100V 10% C32 C35
1024823 CAP MPF .01uF 400V 10% C18
11 027267 CAP MPF .022uF 100V 10% C23-25 C55-56 C58 C60 C62-63 C75-76
2024835 CAP MPF .022uF 630V 10% C160-161
9027272 CAP MPF .047uF 63V 10% C9-10 C87 C131-133 C138-139 C143
1027275 CAP MPF .068uF 100V 10% C22
1027277 CAP MPF .082uF 100V 10% C14
8027280 CAP MPF .15uF 63V 10% C28-29 C46-47 C49-50 C52-53
2024853 CAP MPF .1uF 250V 10% C157-158
4024854 CAP MPF .1uF 400V 10% C3 C7 C13 C17
6027278 CAP MPF .1uF 63V 10% C1 C21 C101 C122 C134-135
1027281 CAP MPF .22uF 63V 10% C137

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PARTS LIST
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
2027283 CAP MPF .33uF 63V 10% C43-44
1027286 CAP MPF .47uF 63V 10% C136
6030937 CAP PFF RDL .0027uF 50V 5% C65-66 C68-69 C71-72
2054357 CAP PPF .001uF 2kV 10% C164-165
1051679 CONTROL 10K5A 10K5C DET R102
11 050514 CONTROL SLIDER 30MM 50KW R71 R127-136
3037600 CONTROL SNAPIN 100K B R80 R100 R119
1047540 CONTROL SNAPIN 250K 15A R12
2037597 CONTROL SNAPIN 250K 30A R31 R42
1041510 CONTROL SNAPIN 25K B R107
2051681 CONTROL SNAPIN 25K DET 2B R58 R62
1051677 CONTROL SNAPIN RND 10KB 250KB R17
2026133 CONTROL TRIM 25K LIN R335 R361
14 064089 DIODE 1N4003 LL CR75-78 CR80-87 CR101-102
17 026730 DIODE 1N4006 800V 1A CR62-64 CR72 CR88-95 CR97-100
CR103
53 006260 DIODE 1N4448 SIGNAL LL CR1-25 CR27 CR29-39 CR44-50 CR52
CR54-60 CR96
8048361 DIODE 1N5407 800V 3A CR65-71 CR74
2029690 DIODE HV 3KV 200mA CR73 CR79
32 025802 FSTN TAB MALE .250x.032 PCB MT CP1-12 CP14-15 CP17-28 CP32-34
CP36-38
2026000 FSTN TAB MALE PCB MT .187X.032 CP13 CP16
4031041 FSTN TAB ML RTANG PCB .25x.032 CP29-31 CP35
6051094 FUSE CLIP PCB 5MM (EXPT) XF1 XF2 XF3
2013112 FUSE TD 20mmx5mm 250v 1A F1-2
1013109 FUSE TD 20mmx5mm 250v 250mAT F3
3033379 CABLE RIBBON 3 CKT 10" P9A P11A P12A
3049334 CABLE RIBBON 3 CKT 20" P6A P7A P10A
6027410 HDR .1 CTR 3 CKT SQ PIN P6B P7B P9B P10B P11B P12B
1051655 CABLE 6 CKT 14" P5A
2053856 CABLE RIBBON 6 CKT 8" P3A P8A
3027413 HDR .1 CTR 6 CKT SQ PIN P3B P5B P8B
1048914 CABLE RIBBON 8 CKT 7" P4A
1027416 HDR .1 CTR 8 CKT SQ PIN P4B

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
2041808 HEADER 8 CKTx.1" LO P1B P2B
2041825 HEADER 8 PIN VERT. P1A P2A
1051680 IC AUDIO PROCESSOR SSM2120 U18
18 051198 IC DUAL OP AMP BA4560N SIP U1 U5-8 U11-16 U19-23 U26-27
6016795 IC DUAL OP AMP TL072 U2-4 U9-10 U17
1051856 IC QUAD 2-IN NAND GATE 4011 U25
1013562 IC REGULATOR +15V MC7815CT U28
1013564 IC REGULATOR -15V MC7915CT U29
1041261 IC VOLT REF LM4040DIZ-10.0 U24
2051006 JACK 1/4 PCB DUAL TIP MONO J1 J5
1051007 JACK 1/4 PCB STEREO W/ SWITCH J7
1051658 JACK MONO R/A J8
3053450 JACK STEREO R/A J2-4
3026481 JACK TIP J9-11
1049892 JACK XLR MALE J6
3031871 LED BI-COLOR 5mmx5mm LD6-8
5028039 LED RED 5x5mm SLB-55VR3 LD2-5 LD9
1033177 LED RED/GREEN 5x5mm BI-COLOR LD1
1051411 SPACER LED .4x.1 TURQUOISE AT LD1
5990470144 SPACER LED.7x.125 BLUE A6192-3 AT LD2-5 LD9
3041527 SPACER RND NYL .680x.250x.147 AT LD6-8
4025116 RES CF 1/2W 100K 5% LL R10 R16 R27 R39
5026368 RES CF 1/2W 100ohm 5% LL R317-318 R354-356
1048903 RES CF 1/2W 18k 5% LL R331
4026493 RES CF 1/2W 2.7K 5% LL R234 R237 R241 R287
1047436 RES CF 1/2W 270ohm 5% LL R357
1027869 RES CF 1/2W 470ohm 5% LL R221
4025941 RES CF 1/2W 560ohm 5% LL R258 R337 R342 R347
4024967 RES CF 1/4W 5% 1.2k LL R6 R14 R79 R150
2024969 RES CF 1/4W 5% 1.5k LL R38 R50
2025073 RES CF 1/4W 5% 1.5M LL R124 R189
15 024997 RES CF 1/4W 5% 100k LL R4 R29 R46 R75 R113 R181 R204
R226 R271 R273-275 R289-290 R307

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
68 024981 RES CF 1/4W 5% 10k LL R1 R5 R8 R15 R18 R20-21 R25 R28 R33
R36 R43-44 R48 R51 R56 R61 R63-64
R66-69 R76 R81-83 R87 R97 R99 R106
R108-109 R112 R114-116 R121 R125
R177 R184 R190 R193 R197 R200-201
R208-209 R212 R217 R228 R231-232
R243-245 R248 R253-254 R261 R266
R276
R285 R291 R298 R305 R308 R351
5024937 RES CF 1/4W 5% 10ohm LL R178-180 R203 R296
1024998 RES CF 1/4W 5% 120k LL R13
2029539 RES CF 1/4W 5% 13k LL R53-54
5024999 RES CF 1/4W 5% 150k LL R35 R91 R292 R319-320
4024985 RES CF 1/4W 5% 15k LL R157 R163 R169 R175
4024986 RES CF 1/4W 5% 18k LL R84 R86 R145 R151
8024965 RES CF 1/4W 5% 1k LL R90 R94 R162 R174 R294-295 R297
R332
23 025069 RES CF 1/4W 5% 1M LL R2 R19 R26 R32 R37 R45 R49 R92-93
R110 R210 R215 R219 R224 R236
R246-247 R251-252 R264 R279 R282
R286
2024971 RES CF 1/4W 5% 2.2k LL R170 R218
2025075 RES CF 1/4W 5% 2.2M LL R225 R267
3029455 RES CF 1/4W 5% 2.4k LL R98 R120 R146
3025059 RES CF 1/4W 5% 220k LL R11 R207 R293
7024956 RES CF 1/4W 5% 220ohm LL R95-96 R122 R182-183 R195 R205
20 024987 RES CF 1/4W 5% 22k LL R23 R40 R72-73 R78 R103 R214 R222
R229 R233 R238 R240 R242 R249 R259
R265 R268-269 R277 R284
4024988 RES CF 1/4W 5% 27k LL R239 R255-256 R304
1029005 RES CF 1/4W 5% 2k LL R158
7024973 RES CF 1/4W 5% 3.3k LL R34 R140 R144 R152 R160 R164 R172
2026504 RES CF 1/4W 5% 3.6k LL R57 R59
2024975 RES CF 1/4W 5% 3.9k LL R138 R154
5028865 RES CF 1/4W 5% 30k LL R153 R159 R165 R171 R270
2025061 RES CF 1/4W 5% 330k LL R24 R230
15 024989 RES CF 1/4W 5% 33k LL R60 R117 R137 R141 R147 R185 R191-
192 R198-199 R211 R227 R250 R278
R283
2025063 RES CF 1/4W 5% 390k LL R333 R353
4024991 RES CF 1/4W 5% 39k LL R88 R118 R186 R188
4029610 RES CF 1/4W 5% 3k LL R148 R156 R168 R176
1029472 RES CF 1/4W 5% 4.3k LL R166

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
8024977 RES CF 1/4W 5% 4.7k LL R47 R52 R142 R216 R235 R339 R344
R349
1025828 RES CF 1/4W 5% 430k LL R213
4025065 RES CF 1/4W 5% 470k LL R41 R77 R206 R358
7024961 RES CF 1/4W 5% 470ohm LL R260 R272 R280-281 R338 R343 R348
9024993 RES CF 1/4W 5% 47k LL R104-105 R202 R373-378
10 024947 RES CF 1/4W 5% 47ohm LL R7 R9 R65 R89 R126 R187 R257 R262-
263
R306
5024978 RES CF 1/4W 5% 5.6k LL R3 R30 R70 R74 R85
2024994 RES CF 1/4W 5% 56k LL R155 R167
1028948 RES CF 1/4W 5% 6.2k LL R55
2024979 RES CF 1/4W 5% 6.8k LL R194 R196
7024995 RES CF 1/4W 5% 68k LL R101 R111 R123 R139 R143 R334 R369
2025942 RES CF 1/4W 5% 7.5k LL R161 R173
1024980 RES CF 1/4W 5% 8.2k LL R149
8025068 RES CF 1/4W 5% 820k LL R288 R299-303 R321-322
2027353 RES FILM 1W 100K LL 5% LL R326-327
1027349 RES FILM 1W 10K 5% LL R359
2041706 RES FILM 1W 470k 5% LL R313-314
6027354 RES FILM 1W 5% 220k LL R336 R340-341 R345-346 R350
3036470 RES MOX FP 1W 5% 10k LL R328 R379-380
2054213 RES MOX 2W 100k 5% LL R311-312
1053945 RES MOX 2W 150k 5% LL R329
2031629 RES MOX 2W 1ohm 5% LL R365 R368
1028021 RES MOX 2W 470ohm 5% LL R220
12 027628 RES MOX 2W 47ohm 5% LL R309-310 R324-325 R362-364 R366-367
R371-372 R381
2053947 RES MOX BT 18Kohm 5W 5% R316 R323
1053948 RES MOX BT 39Kohms 5W 5% R360
2031703 RES WW BT 10W 10% .22 ohm R330 R352
1026483 RES WW BT 10W 10% 2.7k R370
1053950 RES WW BT 18k 10W 10% R315
5050817 SWITCH PB PC VERT MNT DPDT S2-4 S6 S9
1049557 SWITCH PC MNT 2P3T S10
4028091 SWITCH PUSH SLFLK SHORT STROKE S1 S5 S7-8

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
9048451 BUTTON PUSH OFF WHITE AT S1-9
1026411 THERMISTOR 2.5 OHM 8A C30-19 TH1
4051442 SOCKET TUBE 9 PIN PCB MOUNT XV1-4
1027325 XFMR LINE OUTPUT T1
10 041465 XSTR N-CH JFET J113 TO-92 Q1-9 Q15
5016739 XSTR NPN 2N4401 TO-92 Q11-12 Q19-21
6016742 XSTR PNP 2N4403 TO-92 Q10 Q13-14 Q16-18
3031729 DIODE ZEN 1N5231B.5W 5.1V 5% CR42 CR51 CR53
1029898 DIODE ZEN 1N5236B 7.5V 5% LL CR43
3031635 DIODE ZEN 1N5240B 10V 5% CR40-41 CR61
2031019 DIODE ZEN 1N5245B.5W 15V 5% LL CR26 CR28
1054385 WIRE SET PCB SUNN 300T
2025796 HEATSINK TO-220 AT U28-29
2017746 WSHR SHLDR NYL 1/8x1/4 AT U28-29
2017974 INSULATOR MICA TO-220 AT U28-29
2027638 SCRW TF 4-40x3/8 HWHS ZI .1" HD AT U28-29
12 014171 SCRW M 4-40x3/8 PHP BLX AT XV5-10 TOP
16 039420 SCRW M 4-40x3/8 PHP SS SEMS AT XV5-10 BOTTOM, GEQ REAR PCB
12 040533 STANDOFF 4-40x.937 AT XV5-10
4016747 STNDOFF RND AL 4-40x3/4x1/4 AT GEQ REAR PCB

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
CHASSIS ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1057678 CHASSIS BASSMAN 300
1053639 PCB ASSY SUNN 300T
1050853 XFMR PWR 300W 120V DOMESTIC UNITS
1053942 XFMR PWR 300W 100/230/240V EXPORT UNITS
1050854 TRANSFORMER, OUTPUT
1047213 CONNECTOR AC LINE MALE IEC
3036703 FUSE HOLDER 5MM FINGER GRIP TUBES, EXPT. PWR (4 IN 230/240V)
1036702 FUSE HOLDER 3AG FINGER GRIP 100,120V POWER
4053893 TUBE SHIELD SUNN MODEL T @ PRE TUBES
3013004 FUSE TD 20mmx5mm 250V 100mA SCREENS
1028330 FUSE QA 1-1/4x1/4 250v 10A DOMESTIC POWER
1020798 FUSE QA 20mmx5mm 250v 5A EXPORT POWER
8025819 NUT KEPS 10-32 ZINC 4/XFMR
4053479 NUT HEX 7/16 20X1/8 NI @ REAN JACKS
5016352 NUT HEX 3/8-32x3/32 TK NI 1/4" JACKS
12 039370 RETAINER ANCHOR TUBE SPRING 6550's
12 053956 SPRING, EXTENSION 2.49x.15" 6550's
6039364 WASHER EPDM TUBE CLAMP DAMPNER 6550's
6039369 RETAINER TOP TUBE SPRING 6550's
1053892 COVER BOX BIAS CONTROLS MODEL T RELEASE
11 024604 KNOB BLACK W/WHITE STAMP 1-10 @ CONTROLS
2051155 SCRW SMB #4x3/8 PHP BLX AT NEUTRIK XLR
2021568 SCRW M 6-32x3/16 PHP NI AT IMP SEL
23 031184 SCRW M6-32x1/4 PHPS BLX ITLW PCA/CHASSIS
4014171 SCRW M 4-40x3/8 PHP BLX EQ PCB TO CHASSIS
1038900 SCRW TF 6-32X1/4 PHP ZI AC GND
4032806 SCRW TF 6-32x1/4 PHP BLX AT IEC, BIAS COVER
4016747 STANDOFF 4-40X3/4" RND AL EQ PCB
4054386 STANDOFF M/F 4-40x9/16 HEX AL EQ PCB
1036570 SWITCH TOGGLE DPST W/NUTS POWER
1051855 SWITCH ROCKER DPST W/ BEZEL STANDBY
1022293 WSHR FLAT .473x.750 NI @ PWR SW
4053480 WASHER FLAT .442 X.692 NI @ REAN JACKS
3990430010 WASHER LCK INTL 3/8x.681x.032 IN & SPKR JACKS

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
CHASSIS ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
5031153 WSHR FLAT 3/8x.614 NI 1/4" JACKS
6048489 TUBE 6550WA OUTPUT
3013341 TUBE 7025/12AX7WA RUSSIAN MADE
1023531 TUBE 12AT7 CHINESE
CAB ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
80029071000 CORNER NOTCHED NICKLE (FD)
40051049000 FOOT RUBBER 1.5 DIA
20032524000 INSERT HANDLE
40019279000 HANDLE CAP 2 HOLE NICKEL
20027846000 HANDLE 9.25" NO LOGO
16 0026571000 SCRW SMAB 8X5/8 THP NI @ CORNERS
40026625000 SCRW WOOD 8x1 FH
80031344000 SCREW SMA 10x3/4 OHP IN
0.03
80027648000 TAPE ALUM 6"x60YDS
1.56 0051343000 VINYL TOLEX 4227A
END ITEM
QTY PART # DESCRIPTION REFERENCE DESIGNATION
10057738000 CHASSIS ASSY BASSMAN 300 120V
10057741000 CHASSIS ASSY BASSMAN 300 240V AUST
100577424000 CHASSIS ASSY BASSMAN 300 220V ROK
10057739000 CHASSIS ASSY BASSMAN 300 230V/230V UK
10057737000 CHASSIS ASSY BASSMAN 300 100V
10051392000 CAB ASSY SUNN 300T
10047248000 CORD PWR W/IEC CONN DOM DOMESTIC - 120V
10047250000 CORD PWR W/IEC CONN 240V AUST 240V AUST
10047249000 CORD PWR W/IEC CONN 230V UK 230V UK
10047251000 CORD PWR W/IEC CONN 230V 230V
1
10053997000 0057674000 CORD PWR W/IEC CONN 100V CORD PWR W/IEC CONN 230V ARG 100V 230V ARG
10057745000 FOOTSWITCH 3 BUTTON BASSMAN
20051204000 FOAM TAPE 1/4" 1/16 3M4516 @ TOP OF FRONT GRILLE (PER FT.)

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
END ITEM (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
10057682000 GRILLE BASSMAN 300
10053598000 GRILLE REAR SUNN 300T
80050311000 NUT 2-56 NYLON INSERT 2CNME-Z @ NAMEPLATE
80036112000 SCRW SMAB 6x1-1/4 OHP BLX w/WS GRILLE MOUNTING
80036199000 SCRW M 8-32x1-3/16 OHP BLX CP CAB/CHASSIS
30050312000 SCRW 2-56X3/8 FHP NI @ NAMEPLATE
8
10029527000 0047600000 WSHR FNSH 8-5/8 FLNGD BLX WX NAMEPLATE FNDR BLACK (994095) @ CAB/CHASSIS SCREWS

BASSMAN 300
(This is the model name for warranty claims)
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
FOOTSWITCH END ITEM
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1053897 PCB ASSY FTSW 3 BTN SUNN BASS
1057746 PLATE FTSW 3 BTN BASSMAN
1028895 CABLE ASSY FTSW RT ANG 12'
1028109 HSG END CUP LEFT FTSW
1028143 HSG END CUP RIGHT FTSW
1028141 HSG FTSW 3 BUTTON
1031647 NUT HEX 12mmx1mm Nl
8028684 SCRW SMB 6x3/8 PH PHS BLX
3031899 WSHR NYL .485x.775x.150 TK
FOOTSWITCH PCB ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1053898 PCB FAB FTSW 3 BTN SUNN BASS
2000626 DIODE 1N4448 SIGNAL LL
1031017 DIODE ZEN 1N5223B 2.7V 5%
2027327 DIODE ZEN 1N5234B 6.2V
3028039 LED RED 5x5MM SLB-55VR3
1037036 JACK PHONE PCB MONO CA PREMIUM
3041527 SPACER RND NYL .680x.250x.147
3028714 SWITCH PUSH SPDT