Sadowsky Onboard Preamp Kit with Vintage Tone Control – PARTS ONLY, UNWIRED.
The new 4 control hole unwired preamp kit features the new surface mount circuit board. For J-style basses, the kit requires a side jack, so all 4 holes on the control plate can accept the potentiometers. The kit includes an extra volume pot so you have the flexibility to wire it as Vol/Pan or Vol/Vol. This is the exact same circuit and controls that go into every Sadowsky bass. Does not work with active pickup basses.