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PULL - MID BOOST N/C P6.S1 C20 D R13 220K V1.A 1 2 3 R12 1.5K C12 10 L1-A 4 C15 560PF 8 6 R1 2.2M D R3 220K 1/2W V1.B 6 7 8 R2 1.5K C2 .01 400V D 12mV @ 1K = 25V @8 185V C13 .001 cw P5 5A500K C14 250PF
C22
B4
.001 C27 560PF R20 100K R21 47K cw C23 .0022 R22 10K C25 .001 N/C cw
CHANNEL 2 DRIVE
D R15 220K 1/2W 160V V2.B 6 7 8 R14 4.7K C16 10 D1 1N4745 D3 1N4745 D2 1N4745 D4 1N4745
D R18 220K 1/2W 185V 47K .0022 400V 2 3 R17 560 C18 10 N/C P1.S1 N/U C10 C9 .047 400V R8 220K C8 N/U JUMPER R9 N/U C11 N/U 1 V2.A C19 .047 400V
560PF R19 100K C21 .0022
R16
C17
400V
TREB
P9 B100K C26 .0022 P6.S2
R25 R24 15K +3V RELAY L1-B 13 1 16 D5 100K
P7 B1MEG
BASS
C24 .047
MID
P8 15A25K C54 N/C P1.S2 N/U R11 N/U N/U cw R23 22K
9 CH2 CH1
INPUT
J1
P6 B250K PULL POT
11
VOLUME 2
+ + 30mV @ 1K Hz = 28V @ 8 C28 2200µF 6V D7 C29 2200µF 6V
CHANNEL 1
C5 82PF
R7 220K 1/2W
D10
VOLUME 1
C7 cw 330PF
R4 150K cw C3 .001 C4 .033
195V 6 V3.B 7 8 R6 1K
R10 N/U
R27 100 R28 100
DC FILIMENTS FOR V1,V2 4,5 C30 2200µF 6V C31 2200µF 6V
D6
D8
D9
BASS
C1 P2 10 B1MEG
R5 100K
cw
TREB
P4 B1MEG
9
F4 1 AGC
+
P1 B100K
+
C6 .0047
QC16
MID
P3 15A25K cw R60 4.7K C42 C41 .001 400V R47 100K R44 C40 10 22K C43 .047 P10 B100K R43 22K + R46 C R41 560 560 R45 100K 3 2 V5.A 1 R49 100K 1 R51 220K C45 .047 400V 300V C37 N/U H4B-2 C36 .0022 R36 220K S3-A H4B-1 H4A-1 H4A-2 R52 220K C46 47/63V + QC5A QC5B 5 R64 4.7K H2B-2 R65 4.7K 8 E 3 V8 4 27PF 300V V5.B 6 7 8 C44 .047 400V H2A-1 H2B-1 R61 4.7K 3 1 5 8
B6
V6 4
D R42 220K 1/2W 280V C39 60mV @ 3K = 25V @ 8 -3dB @550Hz .047 R40 1MEG V3.A 2 3 1
30-77703 2/2
220mV INPUT @1K=25V @ 8
8 5 4 V7
RETURN
J3 H1B-3 H1A-3
R48 100K
R50 220K
1
3
B1 C B4
C33 180PF R32 0 R31 2.2M 8 R33 220 V4.B 7 6
25V @ 8 = 25V NO TANK LOAD R34 47K 1W 250V C35 .047 400V QC1 QC3 QC2 QC4
D R38 220K 1/2W 190V V4.A 1 2 3 R37 560
B5
R39 100K C38 .001 400V
REVERB
70-00927
REVERB
H2A-2
350 5W
8 5 1 3 4 V9
R67 350 5W
GND C34 10 R35 2.2M
100
100 QC6B H3A-3 SET P11 FOR 100mA ACROSS STANDBY IN 100W POSITION P11 R53 22K C cw 20K
BIAS ADJ
D12 1N4007 R54 100K C47 .047/600V QC6A
445V 415V 385V R55 4.7K C49 1W 22 500V R56 2.2K C50 1W 22 500V R57 350 C51 10W 22 500V 455V C52 22 500V
FOOTSWITCH FS22
TIP H10-1 S10 D
CHANNEL
SLEEVE H10-2
C48 22 500V
D13 RING H10-3 S11
D14
REVERB
1N40071N4007 D15 D16
1N40071N4007
GNDA
GNDB
30-77701
L2-B 9 13 11 H1A-2 R25 100K R26 22K
30-77703 1/2 SEND
B5
H1A-1 H1B-1
J2
B1
H1B-2
30-77706
+3V RELAY L2-A 8 4 1 16 C32 .1 R30 2.2K R29 10 1/2W H3A-2 H3B-2 H3B-1 H3B-4 R71 10K H7A-1 H7A-2 H6-1 H6-2 R72 10K C71 .022 C72 180PF 6 H9A-1 H9A-2 H9B-2
PRESENCE 2
H9B-1 cw P15 15A25K
H8B-1 H8B-2
PRESENCE 1 30-77705
cw P14 15A25K
GAIN / OUTPUT
FUNCTION CH1 INPUT 18mV FREQ. 1K SPEAKER OUTPUT 25VAC 8 TONE ALL FULL
8dB @ 10K Hz
CH2 CH2
30mV .3mV 60mV
1K 1K 3K
28 VAC 8 DRIVE STARTS TO CLIP 25VAC 8
FULL
H5-2
REVERB REC.
-3dB @ 300Hz
LAMP
H5-1
4.6VAC
30-77707
H8A-1 C70 .01 R70 1K
H8A-2
REVERB DRIVE
CH1 VOL 10 - C7 CH1 VOL @ 2 CH1 PRESENCE
9dB @ 10K 26dB RISE FROM 1K TO 10K ALL TONE FULL 40dB RISE FROM 1K TO 10K MIDS OFF - BASS TREBLE FULL 9.5dB @ 10K 2.2K IN SERIES WITH .01 FEEDBACK
4/5
V3,V4,V5 12AX7 TUBE FILAMENTS
H3A-1 H3A-4
9
PROBLEM BIAS SETS OK FOR POWER TUBES BUT CAN'T GET ANY SIGNEL FROM V5 TO V6-V9
INSPECTION FOR H2A1&2 H2B1&2 SOLDER BRIDGE SOLDER BRIDGE PIN 1&2 REVERSED PIN 1 REVERSED OR SOLDER BRIDGE
B6
EL34 / 5881 R62 350 5W R63 350 5W H7B-1 H7B-2
S6 CLOSED=CH2 OPEN=CH1
SQUARE WAVE OSCILLATOR AT SPKR OUT H2B1&2 NO AMP FEEDBACK - EXTREME GAIN CABINET VOICED R73 470K SELECT SWITCH DOES NOT WORKNO VOLTAGE ON RELAY H3A1 TO 4 H3B 1 TO 4
B3 30-77708
B2
CHANNEL SWITCH
LINE OUT
J4
PCB Rev (C) Assembly Revision History
(I to J) (J) 5-23-95 Rev (C) PCB
D20 N/U OUTPUT TRANSFORMER T2 QC31 BLU 16 8 QC32 RED 4 ORG YEL GRN ORG YEL GRN
C73 .0047
R74 22K
S1
IMPEDANCE
16 8 4
R6 to 1K R8 to 220K R17 to 560 R30 to 2.2K
R37 to 560 C6 to .0047 C8 to N/U C33 to 180PF
C37 to N/U D21 to N/U D20 to N/U
SPK1 SPK2
(K) 8-22-95 Rev (C) PCB
QC33
BRN
0 15-02116
BLK
BLK
R24 to 15K C16 to 10µF P3, P8, P14, P15 from A25K to A15K (Note: less gain from both channels)
R66 350 5W
D21 N/U
QC34A
QC34B 1/2 POW.
OUTPUT LEVEL S2
(L) 10-7-95 Rev (C) PCB
4-PW. TUBES 2-PW. TUBES
R3, R7, R15, R18, R38, R42 from 220K, 1% to 1/2W, 220K
R67 350 5W
FOOTSWITCH
J5 EL34 TUBE FILAMENTS 2 F2 10SB V6-V9 QC36 7 QC13B 5.9A 3.2VAC H3B-3 GND TIP QC35 5.9A 3.2VAC
R68 100 R69 100
B2
B3
5. 4. 3. 2. 1.
ADDED AS SECONDARY OPERATION ARE DENOTED . ALL OPEN GROUNDS ARE A ,EXEPT AS NOTED. ALL DIODES ARE TYPE 1N4003, EXCEPT AS NOTED. ALL CAPACITORS IN MICROFARADS, EXCEPT AS NOTED. ALL RESISTORS ARE 1/4W, EXCEPT AS NOTED.
*
QC13A
NOTES UNLESS OTHERWISE SPECIFIED.
STAND BY
QC14 C53 .047 600V S7
CARVIN
B6
T1 RED BLK PL1 N E (240V) RED GRN ORG L INTERNAL FUSE 3A SLOW BLOW 5mm x 20mm S8 3.5V BRN Y/RD B/W DRAWN BY:
12340 WORLD TRADE DR. SAN DIEGO, CA 92128 (619) 487-1600 FAX 487-6629
QC7 350 VAC
VALVE MASTER
ALL TUBE GUITAR AMP
DATE:
QC8 F1 1AGC QC9 F3 1AGC QC10 QC11
C. McEUEN
APPROVED: DATE:
14DEC94
350 VAC
POWER
OFF O/W
PCB NO: ASSY. NO: REVISED BY:
30-77701 80-77701
C. McEUEN
REV:
C G
7Oct95
REV:
GRN
DATE:
15-10600