Fredric Effects Utility Perkolator MKII 

The Utility Perkolator is Fredric Effects latest version of the fabled Interfax Harmonic Percolator from the 1970s. The Harmonic Percolator is a simple yet fascinating circuit which readily lends itself to tweaking and improvement. They already build a faithfully vintage correct version of the Harmonic Percolator, however the Utility Perkolator takes this circuit in another direction.

Using higher gain, lower leakage Russian Germanium transistors, and a low pass filter which only removes the high-end hisses and glitches associated with the HP, the Utility Perkolator has a considerably lower noise floor. The result is a tighter and more controllable effect which is still capable of producing the classic Harmonic Percolator sound.

In this new Utility Perkolator version they've added a switchable ring modulation circuit for splattery octave effects, and some DIP switches on the circuit board to remove the low pass filter if required.