Supro 6420 schematic
)
V
D
(A)
)
V
)
VVV
v
K
T
r
V
()
138V
V
C7
NOTE 1
V
VVV
R1,R2,R15,R16
2-Heater
All other voltages
1 K
100 K
1N4004
Blk
p
Red
p
VVV
v
R2
47KR3270K
This ground
Wire screws to
The bottom in the
Metal plate inside
Amp
120 Volts
AC
)
(
R5
VVV
100K
R1
47K
C1
.005
R4
VVV
3.9K
.
R1 and R2 CAN BE (2) 100k RESISTORS
IN PARALLEL MAKES 50K
TOTAL (8) RESISTORS
Lamp
Blk
V1
12AX7
.
1
197V
.
.
2
3
2.20V
VVV
C2
)
35 Mfd
6-35V
.
.
ALSO R15 and R16
100K
VVV
100K
2 Position
Blk
.01
C14
1400V
)
3 Am
Fuse
C3
.001
Switch
1400V
600V
C4
.05
)
e
Volum500
Audio
Taper
)
.
Now 50K
.01
C15
V
A
V
R6
150K
C5
.01
Transformer
C6
.003
VVV
Power
Grn
Blk
VV
V
Tone
500k
VVV
)
R7
100k
..
.
Are DC
322 Vac not
connected to bridge
Audio
ape
35 Mfd
6-35V
V2
12AX7 (B)
Red
Red
Green
V1 V2 V3 V4
Green
V2
12AX7
8
VVV
)
V
V
3
2.0V
310 Vac
connected
D1
6
7
.
1.4V
R8
3.9 K
.
R9
2.2K
.
167V
D1
20 20 10 10 4
Mfd Mfd Mfd Mfd Mfd
C10
6.3 Vac To Filaments
C
600V
R 10
270 k
.
VVV
.
.
VVV
2
.
1
.
R 11
270 k
397V 390V 337V 259V
A B C D
.
R18 R19
7 Watt 1 Watt 1 Watt
VVV
)
C11 C12
C8
.05
.
)
R12
270K
.
VVVVVV
337V
)
.05
C9
600V
R14
470K
.
27 K
VVV
)
)
All Filter Caps are 450 Volts
.
R15
47K
VVV
R13
12K
V
V
.
R20
VVV
)
R17 200 Ohm
VVV
R16
47K
)
C13
B
A
V3
6L6GC
5
0.40V
VVV
7 Watt
5
0.50V
V4
6L6GC
Supro 6420 Thunderbolt Bass Amp
.
.
.
.
3
6L6GC
390V
3
4
.
.
8
.
.
o
390V
397V
4
390V
1-No connection
3-Plate
4-Grid #2
5-Grid #1
6-No Connection
7-Heater
8-Cathode and Beam Plate
50 Watts
Late 1966
Jim Mitchell
05/013/2007
.
30V
.
.
8
Output
Tranformer
o
12AX7
8 Ohm
Loading...