This is probably one of the best Earthquaker pedal, I like it better than Zap Machine. It's a buzzaround, NOS germanium transistors. It's also got a timbre knob, which is a diode tone clipper of sorts. I mostly use it without that, but its nice to have the option. With the tone circuit wide open, however, it's huge and rich. Low output guitars ,which tend to work best on fuzz pedals, sing on this pedal, while hot humbuckers tend to clip the diodes, which is its own sound, but I prefer the low output pickups, cause that's really the best way to make fuzz bloom, and bloom it does: rich, thick, 3d, classy. In excellent condition, but does not come with original box (but I will replace the missing screw in the pic!).