Bowman Audio Endeavors Harmonic Percolator - Pedal of the Day
TONEHOME - the World of Vintage Guitar Effects Pedals - InterFax
1975 InterFax "Harmonic Percolator"distortion-FUZZ made by ED GIESE in Milwaukee Wisconsin. w/ Silicon NPN & Germanium PNP in a design tha… | Fuzz, Percolator, Moog