Hand wired, Transistor based Overdrive. Post knob controls the volume, Pre controls the gain, Bright control is your tone stack… adding more bite as you turn it up. ThePremium sounds like a very natural amp gain. It’s open and raw, gets great feedback when cranked, and stacks very well. These are nowhere in the realm of TS overdrives, so if that’s what you want, look elsewhere. Warm and bluesy, saturated full stack, bright gain boost for solos… it’s in there. No buffers, True Bypass. 9V battery or neg. ground DC jack.