Carl Martin 1993-2003 Hot Drive'n Boost mk3 in very good conditions, functions perfectly.

From Carl Martin:

Completely new overdrive design provides even more authentic tube amp simulation than the celebrated original, widely recognized as one of the best overdrive pedals ever made.

Exceptional transparency preserves original guitar tone without midrange emphasis, low-end cut, or high-frequency roll-off—unlike nearly every other overdrive pedal on the market.

Sounds like a tweaked-up quality tube amp with clear, brilliant tube drive character that enhances rather than transforms your core voice and playing dynamics.

Integrated 20dB transparent boost function makes it a true "two in one" pedal, providing extra kick for solos to stand out above the mix.

Built-in regulated ±12V power supply with low output impedance ensures maximum headroom, low-noise operation, and improved working conditions for guitar amplifiers.