The Fredric Effects Silicon Harmonic Percolator is a fuzz pedal based on the Interfax Harmonic Percolator from the 1970s. Fredric Effects has been producing fuzz pedals of this style for many years. In addition to recreating the original model, we have also been producing an improved silicon-germanium hybrid called the Utility Percolator. The harmonic percolator is a simple yet fascinating circuit. Carefully selected components produce a captivating sound. The Silicon Harmonic Percolator uses silicon transistors manufactured in the former East Germany and clips with a special East German diode array. It can be powered by a 9V DC center-negative adapter or a 9V battery. Recreating a Vintage Harmonic Percolator: Features. The Fredric Effects Silicon Harmonic Percolator is a fuzz pedal based on the Interfax Harmonic Percolator from the 1970s. Fredric Effects has been producing fuzz pedals of this style for many years. In addition to recreating the original model, we have also been producing an improved silicon-germanium hybrid called the Utility Percolator. The harmonic percolator is a simple yet fascinating circuit. Its meticulous components create a captivating sound. The Silicon Harmonic Percolator uses silicon transistors manufactured in the former East Germany and clips using a special diode array manufactured in the former East Germany. It can be powered by a 9V DC center-negative adapter or a 9V battery. Type: Fuzz Adapter: 9V center-negative battery Power: 9V battery Controls: GAIN, VOLUME, Clipping ■Management Code: 4562459913356 Category: Effects Electric Guitar Effects Fuzz Musical Instruments, Crafts, Collectibles Musical Instruments, Equipment Guitar Guitar Effects JAN/ISBN Code: 4562459913356 Product Code: mt0188562