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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

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