Harmonic Percolator - Exact physical and electrical duplicateof the original. The Harmonic Percolator is a distortion pedal that was made in Milwaukee, Wisconsin in the 1970's. It used a silicon and a germanium transistor in a design that passes even order harmonics. The left slider is the input gain or distortion control and the right one is the output control. This is THE original circuit, not someone's interpretation of it. FEATURES INCLUDE: Same type number obsolete transistors and original diodes, Same type capacitors (Mylar, Silver Mica, Tantalum, Electrolytic), Classic brown and tan powder coated case (exact same physical style), Same type and value slider controls, Better battery holder and rubber feet, and True bypass switching. For more information follow the link below to the THEREMANIACS site...