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Heater Wiring:
Solder one wire to pins 4 and 5 of the 12AX7, another
wire to pin 9 of the 12AX7. Those wires should be Speaker Jack
tightly twisted together and soldered to pins 4 & 5 - In the P1 it isn't necessary to have the
of the 6BQ5. Pins 4 & 5 of the 6BQ5 should be soldered speaker jack connecting to chassis ground.
to the eyelets holding R18 and R19 (marked by X's.) i.e. Plastic isolating washers are OK.
12AX7 6BQ5 - This will probably give you the lowest amount
of noise.
Connect input jack X X X X
5 5
4 6 4 6
ground tab to
3 7 3 7
Preamp Star Ground
2 8 2 8
1 9 1 9
R8
X Power Switch
R6
To "Hot" tab of
R5
input jack To Power
Cord, Green
Wire to separate
chassis ground
R7 R16
R4
+++ +++ +++ +++
R3
R2
C2
+++ +++ +++
R12
R14
R10
R15
R13
R17
R18
R19
R1
C3
C8
C9
C10
C11
D2
D1
C1
C6
C7 C13 C12
C5
R9
HT
Center Tap (Red w/Yellow
X X Stripe)
Standby Switch
Power Amp Star Ground
Note: If your PT has a center-tapped
6.3V winding and you choose to use the
100 ohm resistors, DO NOT ground
AX84 P1 Wiring Diagram Rev. 11 the center tap.
Volume Treble Mid Bass
Drawing revised February 27, 2004
Drawn by Jim Jones
Preamp Star Ground http://members.shaw.ca/house-of-jim