Carvin vt50 schematic
C34 STOPS OSCILLATION
ON TOP WAVE WITH SPKR
FOOTSWITCH FS22
DC FILIMENTS FOR
2.2M
22K
2.2K
ACROSS STANDBY
CHANNEL 2
CHANNEL 1
.047/600V
+3V RELAY
VOLUME 1
VOLUME 2
BIAS ADJ
70-00927
CHANNEL
5A500K
25A25K
25A25K
RETURN
47/63V
REVERB
SLEEVE
REVERB
1N40071N4007
1N40071N4007
1N4007
2200µF
2200µF
1N4745
1N4745
1N4745
1N4745
2200µF
REVERB
250pF
560PF
.0022
120PF
B100K
DRIVE
.0047
H1B-3
B1MEG
.0022
H10-1
H10-2
H10-3
H2A-1
H2A-2
H2B-1
H2B-2
H1A-3
B100K
B1MEG
B1MEG
H3A-3
V1,V2
LOAD.
B100K
.0022
82PF
V1.B
V2.A
V1.A
V2.B
400V
400V
400V
400V
V3.B
220K
.0033
220Ω
.022
220K
1.5K
150K
.001
.033
100K
220K
1.5K
V4.B
V4.A
V3.A
400V
400V
400V
400V
V5.B
V5.A
2.2M
.047
220K
1.5K
220K
220K
.001
100K
100K
.047
560Ω
4.7K
2.2K
350Ω
100K
.047
.047
220K
220K
56K
56K
56K
56K
500V
500V
500V
500V
BASS
TREB
BASS
TREB
400V
.047
QC6B
QC37
QC5
500V
.047
100K
RING
QC6A
1.5K
B100K
2.2M
QC6
.0047
100K
56PF
L1.B
L1.A
L2.B
GNDA
100K
GNDB
280V
190V
300V
300V
190V
190V
.01
.01
220K
220K
TIP
R19
R10
R13
R11
R14
R15
C13
C14
C20
C21
C22
C18
C12
R35
R12
R16
47K
47K
.01
R18
R22
R21
R24
R23
R25
R30
R32
R38
R36
R31R33
C26
C30
C29
C28
C33
R28
R29
R34
R37
R60
R61
R64
R65
C38
C40 C41
C42 C43
C35
C37
C36
R42
R43
R41
47K
22K
22K
10W
C45
MID
MID
C16
S11
S10
C11
C25
CH1
CH2
C27
P11
20K
2/2
C44
D12
D13 D14
D15 D16
R20
C47
GND
R26
QC1
QC2
QC4
QC3
4,5
C19
C39
R40
C34
C46
R39
3.9K
R49
R50
9dB
10K
R27
22K
P10
C31
P1
.047
R8
D5
D1
D2
R1
R9
R5
P5
P7
P8
P9
R3
R2
R4
R7
R6C1
C2
C4
C5
C6
C7
C9
C8
P2
P3
P4
4.7K
1K
10
10
J3
100K
10
22
22
22
22
P6
10
1W
cw
cw
cw
cw
cw
cw
1W
1W
10
cw
cw
B1
22
B4
B4
1M
D3
D4
6V
cw
D7
D9
D6
D8
13
11
16
11
6V
6V
S6
6
7
8
1
2
3
1
2
3
6
7
8
6
7
8
6
7
8
1
2
3
1
2
3
30-77503
INPUT
D
400V
D
ON: 2.1 VDC
D
D
B5
cw
R57
4.7K
C50
.0022
300V
6
7
8
3
2
1
300V
R44
100Ω 1%
R45
100Ω 1%
9
+
C
OFF: 9 VDC
8
6
+
+
4
2
9
+
D10 D11
7
V6
2
3
3
V7
2
7
7
V8
2
3
3
V9
2
7
N/U
9
9
9
9
D
D
190V
J1
G1
FERRITE
BEAD
1MEG
D
9
250V
C
C
385V
D
SET P11 FOR 75mA
415V
445V
455V
40dB RISE FROM 1K TO 10K MIDS OFF - BASS TREBLE FULL
2. ALL CAPACITORS IN MICROFARADS, EXCEPT AS NOTED.
3. ALL DIODES ARE TYPE 1N4003, EXCEPT AS NOTED.
4. ALL OPEN GROUNDS ARE A ,EXEPT AS NOTED.
1. ALL RESISTORS ARE 1/4W, EXCEPT AS NOTED.
9.5dB @ 10K 2.2K IN SERIES WITH .01 FEEDBACK
26dB RISE FROM 1K TO 10K ALL TONE FULL
CAN'T GET ANY SIGNEL FROM V5 TO V6-V9
SQUARE WAVE OSCILLATOR AT SPKR OUT
NOTES UNLESS OTHERWISE SPECIFIED.
5. ADDED AS SECONDARY OPERATION.
BIAS SETS OK FOR POWER TUBES BUT
NO AMP FEEDBACK - EXTREME GAIN
SELECT SWITCH DOES NOT WORK-
DRIVE STARTS TO CLIP
ALL TUBE GUITAR AMP
NO VOLTAGE ON RELAY
ALL TONE FULL: 26dB
15VAC 8Ω NO LOAD
OUTPUT TRANSFORMER
WITH 15VAC 8Ω N/L
PIN 1&2 REVERSED
CH1 HI FREQ RISE
52 VAC 8Ω - N/L
1K
-14.2dB @ 100Hz
40VAC 8Ω-EL34
INSPECTION FOR
PIN 1 REVERSED
-15dB @ 100 Hz
SOLDER BRIDGE
SOLDER BRIDGE
SOLDER BRIDGE
GAIN / OUTPUT
CH1 – VOL @ 2
3A SLOW BLOW
REVERB DRIVE
CH1 PRESENCE
H3B– 1 TO 4
REVERB REC.
FOOTSWITCH
12AX7 TUBE
CLOSED=CH2
5mm x 20mm
H3A–1 TO 4
(VOL1 @ 2)
ALL CENTER
15VAC 8Ω
IMPEDANCE
FILAMENTS
C. McEUEN
C. McEUEN
+3V RELAY
STAND BY
LINE OUT
PRESENCE 1
OPEN=CH1
V3,V4,V5
INTERNAL
FUNCTION
ALL FULL
ALL FULL
CABINET
CHANNEL
350 VAC
350 VAC
PROBLEM
H2B–1&2
H2A–1&2
H2B–1&2
SPEAKER
VOICED
SWITCH
2FEB94
(240V)
4.6VAC
3.2VAC
3.2VAC
OUTPUT
POWER
V6-V9
H1B-2
H8B-1
H8B-2
H1B-1
.0047
H1A-2
H8A-1 H8A-2
H1A-1
H7A-1 H7A-2
H7B-1
H7B-2
H3B-4
H3A-1 H3B-1
H3A-4
H3B-3
H3A-2 H3B-2
QC13B
INPUT FREQ.
SEND
350Ω
350Ω
350Ω
350Ω
SPK1
SPK2
QC51
QC52
QC53
QC54
QC31
QC33
QC35
QC36
1/2W
H5-1
H5-2
LAMP
QC55
470K
A25K
H6-1 H6-2
QC32
5.9A
5.9A
L2.A
FUSE
.047
600V
QC14
Y/RD
TONE
20mV
.3mV
18mV
20mV
18mV
.01
R71
C72
C70
R66
R72
R62
R70
R63
R67
10K
16Ω
YEL
GRN
4/5
16Ω
RED
PL1
OFF
RED
BRN
BLU
R73
22K
QC8
QC7
10Ω
YEL
GRN
P21
1/2
R46
D20
D21
BLK
B/W
ORG
O/W
QC9
GRN
GRN
BLK BLK
TIP
GND
C48
RED
CH1
CH2
CH2
8mV
CH1
J2
T2
S7
8Ω
4Ω
S1
8Ω
4Ω
5W
5W
5W
5W
J4
J5
S8
B1
B2
B2B3
B3
cw
16
13
S6
OR
1K
1K
1K
1K
1K
1K
0
9
N
E
L
2
8
4
6
B5
T1
QC13A
R17
22K
30-77508
30-77503
30-77507
30-77505
VINTAGE 50
30-77501
80-77501
15-10640
15-02066
WHT
EL84 TUBE
FILAMENTS
5
4
30-77501
WHT
12340 WORLD TRADE DR.
SAN DIEGO, CA 92128
(619) 487-1600
FAX 487-6629
REVISED BY:
APPROVED:
DRAWN BY:
DATE:
DATE:
ASSY.
DATE:
ARVIN
REV:
REV:
NO:
PCB
NO:
C
Production Assembly Revision History
Not Used
Not Used
0.56Ω
R47
FUSE LINK
0.56Ω
R48
FUSE LINK
E1
1. Change H3 to a 4 pin Header ribbon.
2. All PCB wire to get Spade Connects.
3. Remove all unused parts.
H1
(H1)
5DEC97
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