For sale Smith BT bass preamp circuit

bought this new direct from Ken Smith basses when my old BT circuit went bad. Took it to the local electronics guy to switch out, somehow he fixed the bad pot in the original preamp. works perfectly after whatever he did to it. This pre sounds wonderful, the classic Ken Smith sound. 3 knob circuit, vol-blend-stacked bass/treble. All plug in components. Never installed, with all components jack wiring diagram etc.