Up for sale, a T-Rex Engineering SpinDoctor Dual Triode Programmable Preamp in near-mint condition and in perfect working order, complete with the original box, paperwork, and power adapter. As its name suggests, this analog preamp is powered by a dual set of triode tubes and features four programmable channels and an intuitive interface that belies a huge amount of tonal sculpting capability.

Tube Drive adjusts the gain stage and offers an additional Boost function for an extra kick of power, and the Tone Control section can be toggled between Bass, Mid, and Treb EQ, or Presence. Settings can be saved via the Store button, and the unique motorized knob system automatically adjusts to your saved settings when the corresponding channel is selected. Sim and MIDI outs enable ease of use with studio setups, with a pop-out Frequency knob to further color the tonal character of the simulation.

The original T-Rex tubes are present, and there are just a few minor scratches on the plexi faceplate, with pristine graphics.

The original box, paperwork, and power adapter are included.