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Harmonic Percolator 1 of 1

Learn more about Harmonic Percolator:

Mfg Part#: HP-1
Sku: 243880146
See more in Guitar Effects Pedals
The Harmonic Percolator is a distortion pedal that was made in Milwaukee Wisconsin in the 1970's. It used a silicon NPN transistor and a germanium PNP transistor in a design that passes even order harmonics while suppressing odd order harmonics. These even order harmonics are more pleasing to the ear than odd order harmonics. This is the original circuit, not someone's interpretation of it. The left slider is the input gain or distortion control and the right one is the Balance control. The input is on the left and the output is to the right when looking down on it. This is opposite pedals of today but in its time this made sense. Left to Right - the same way you read. This EXACT handmade duplicate of the original 1970's pedal employs the same obsolete number Germanium transistor and same number Silicon transistor. (Op Amps were never used in Percolators)
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