Seymour Duncan STC-3A Preamp. This is designed for active pickups. Will not work with passive pickups. It is in good condition and works well. I had this in a P/MM bass I was working on but switched to an EMG pre-amp to go with the EMG pickups.
Four knob set up: Volume, Blend, Mid, and Stacked Bass/Treble.
The volume put also features a push pull put to engage a special slap setting.
$60 Shipped CONUS