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“The Persuader” (K-930)
Schematic
10µ
1M
1M
5KL
.1µ
Output
Input
Foot
Switch
(A)
Foot
Switch
(B)
2
3
1
6
5
4
BS170
N-Channel
MOSFET
G S
D
1N4005
G
D
S
5.1K
4.7K
+
BS170
DPDT Foot Switch
2
3
1
6
5
4
1N4005
*
+
-
9 VDC
Battery
DC Power
Jack
center (-)
+
4
5
V1
+
1K
220µ
220µ
15K
1
2
3
6
7
8
V1
V1
.1µ
68K
1M
33K
.047µ
250KA
1
2
4
3
5
6
7
8
9
Plate1
Grid1
Cathode1
Heater CT
Plate2
Grid2
Cathode2
Heater2
Heater1
V1 (12AX7) BASING DIAGRAM
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BOLD
= DC measurement at maximum gain
PLAIN
= DC measurement at minimum gain
*Diodes are there to protect the MOSFET from
static and accidental reverse polarity.
9.2V
9.2V
8.3V
8.8V
0V
0V
1.9V
3.4V
0V
1.6V
4.0V
7.1V
7.8V
8.3V
0V
0V
6.7V
7.0V
0V
0V
0V
0V
1
2
3/
H
4/
I
5
6/
E
7/
C
8/
F
9/
D
10
11
12
A
B
G
= AC signal test points
NUMBERS
= DC test points
LETTERS
*100mV(AC)
2V(AC)
400mV(AC)
2V(AC)
3V(AC)
*100mV(AC)
AC voltage measurements are rough
approximations of open strumming with
Mexican strat set to full volume/ tone
with pedal controls at max settings
2
3
1
6
5
4
2
3
1
6
5
4
Switching function of the DPDT switch. The solid line
illustrates an internal connection between terminals.
Tube socket measurements with no tube installed:
Pin 1 (plate) = 8.7 VDC
Pin 2 (grid) = 0 VDC
Pin 3 (cathode) = 0 VDC
Pin 6 (plate) = 8.7 VDC
Pin 7 (grid) = 8.0 VDC
Pin 8 (cathode) = 0 VDC
2V(AC)
2V(AC)
3V(AC)