CONE BOARD
WIRE COLOR CHART
A
RED YELLOW YELLOW
B
WHITE RED RED
C
WHITE YELLOW
D
BLACK
E
WHITE ORANGE
F
WHITE GREEN
G
WHITE GREY
H
WHITE VIOLET
I
WHITE BLUE
J
WHITE BROWN
1
5
9
2
6 10
3
7 11
4
8 12
P1-S1 KEY
VARISTOR
MODEL M-10A
NOTES AND EXTRAS
Pot codes: 304-6532
Mfg is Stackpole
Date is 32th week of 1965
AC POWER
FUSE
T1
LYTIC
PS CHASSIS
TUBE VOLTAGE CHART
1
2
3
4
5
6
7
8
9
V1
V2
V3
V4
V5
V6
V7
V8
V9
121
0
2
HTR
HTR
72
0
0.9
HTR
65
0
0.8
HTR
HTR
84
-1.0
0
HTR
75
0
1.2
HTR
HTR
75
0
1.6
HTR
256
56
90
HTR
HTR
104
-0.5
0
HTR
273
75
86
HTR
HTR
266
70
95
HTR
226
0
6.2
HTR
HTR
226
0
6.2
HTR
122
0
1.1
HTR
HTR
211
0
2
HTR
241
49
82
HTR
HTR
85
0
4
HTR
-15.3
-15.3
3.3
HTR
HTR
405
404
X
405
V10
-15.3
-15.3
3.3
HTR
HTR
405
404
X
405
Voltages measured with Fluke 87 DMM referenced to chassis. All controls set to max
CCW. V4 phase shift oscillator was disabled by shorting out the 820K resistor.
V4
V5
V1
V2
V6
V3
V7
V8
V9
V10
S2 SPEAKER
S1 POWER
T2
V10 – 7189A
Power Output
V9 – 7189A
Power Output
V8 – 12AU7
Phase Inverter
V2 – 12AX7
Ch 2 1
st
Preamp
TUBE LOCATOR
V3 – 12AX7
Ch 1 & 2 2
nd
Preamp
V1 – 12AX7
Ch 1 1
st
Preamp
V7 – 12AX7
Reverb Recovery
V6 – 12AU7
Reverb Driver
V4 – 12DW7
Vibrato Oscillator
V5 – 12AU7
Vibrato Modulator
