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Helios (Legacy)

Based On
Pro Co RAT Distortion
Effect Type
Build Difficulty

Legacy PCB

Designed for the 1590B enclosure with side-mounted jacks, which some builders prefer. Bypass PCB (optional) sold separately.


In stock

Updated Version

This project is in the queue for a redesign in the updated 125B format, but it's not yet available. Sign up for our mailing list to be notified of new releases.

Project overview

A classic 80’s distortion pedal, this one needs no introduction. My version can be built with either 3 or 4 knobs (adding the well-known “Sweep” mod), with the Filter knob having two possible orientations to keep things symmetrical.

It also incorporates a switch for the clipping diodes. One side is stock while the other side allows a number of possible modifications, including a “softness” trimmer (clipping threshold control) and plenty of room to stack diodes or use LEDs.

Documentation & Build Reports

Project Documents