Gear News

Harmonic Percolator presented by Fredric Effects

The Fredric Effects Harmonic Percolator is an accurate clone of the Interfax Harmonic Percolator, an oddball overdrive/distortion pedal from the 1970s popularised by Steve Albini of Shellac. It is built to the most recent 'general consensus’ schematic, arrived-at by careful disassembly and measuring of original Harmonic Percolator pedals. The only change Fredric Effects have made is the addition of a switch to offer three different clipping options which adds to the versatility of the effect.

If features all the hard-to-find parts of the originals – new old stock Germanium transistors and diodes from the 1970s – but in a modern pedal-board friendly package, with DC power, LED indicator and normal rotary pots instead of sliders.

High quality construction:
– Custom enclosure fabricated for Fredric Effects in North London
– Professional powder coating and screen print
– PCB construction (not perf or vero)
– Handmade
– Cliff jacks
– Alpha footswitch and pots

Fredric Effects has grown in the last five years to become one of the best regarded UK effects manufacturers. We build high quality boutique pedals at realistic prices working musicians can afford.

Fredric Effects pedals have found their way onto the pedal boards of many well-known and ground-breaking guitarists and bassists around the world.


Fredric Effects Harmonic Percolator


Published since 2005 as a printed magazine, TopGuitar is a magazine of opinion for professional and amateur musicians. Since 2020 on a digital platform. Contain reviews of various guitar-related musical gear, interviews and original articles on world’s most popular artists, music reviews, event reports, guitar workshops and tips, the latest products and artist news. The Editor-in-Chief is Dr. Dariusz Domanski, a guitarist and academic teacher, doctor of musical arts.