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SELECTOR OUT,
TB1, LEFT GND Drain wire with gray
SELECTOR OUT,
TB2, RIGHT GND Drain wire with gray
IN TO OUTPUT
TB3, RIGHT OUT Red wire
IN TO OUTPUT
TB3, RIGHT GND Drain wire with gray
IN TO OUTPUT
TB4, LEFT OUT Black wire
IN TO OUTPUT
TB4, LEFT GND Drain wire with gray
Install the Tone Volume PCB:
1. Install the 1.75” tall standoffs (qty 2) that support the back edge of the Tone
Volume PCB by screwing them into the threaded studs on the chassis. Don’t over-
tighten the standoffs or you will strip the fasteners out of the chassis. Note that the
front two fasteners in the chassis are reserved for future options.
2. Remove and reserve the nuts and washers from the associated rotary controls on
the Tone Volume PCB.
3. Dress the Tone Volume board power connections along the floor of the chassis,
between the standoffs for the input selector board and the tone volume board.
4. Insert the potentiometer shafts fully through the front panel and fit the mounting
holes at the back of the Tone Volume PCB over the screws in the 1.75” standoffs.
You may have to slightly deflect the standoffs to line them up with the holes.
5. Fasten the board in place with 2 4-40x1/4” nuts.
6. Fasten the controls in place using the nuts and washers from step 2. The nuts have
slightly different outside diameters. Use the larger outside diameter nuts with the
balance and volume controls.
Install the Op-amps into the sockets
Install the 8-pin DIP ICs. Align the half-moon feature of the IC with the notch in the PCB
silkscreen. If you need a reminder, see Figure 33. Double check the orientation before
you install the op-amps.
Designation Value Description Done
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