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TABLE OF CONTENTS
1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Helios Classic Distortion is a recreation of the Pro Co RAT Distortion. First released in 1978, it went
through several iterations over the next few decades and was released under other names like the RAT2
and Turbo RAT. The core circuit remained essentially the same throughout its lifespan.
The RAT can be considered an evolution of the MXR Distortion+. It has the same basic op-amp gain
stage followed by diode-to-ground clipping. However, it also significantly alters the EQ in the op-amp
stage as well as adding a tone control and output buffer.
The Helios adds two modifications: a clipping switch to select between different sets of diodes, and a
Sweep control that changes the EQ and gain structure.
The new 125B version of the Helios has been overhauled, reducing some flexibility in favor of an easier
and more straightforward build. The previous version of the Helios will remain available.
USAGE
The Helios has the same control layout as most overdrive or distortion effects:
• Filter is a tone control. It works backwards from the traditional tone control operation, cutting
treble as you turn it clockwise.
• Distortion controls the amount of gain in the op-amp gain stage that is then clipped in a later stage.
• Volume controls the overall output of the effect.
In addition, there are two modifications included for added flexibility:
• Sweep (knob) changes the cutoff frequency of one of the high-pass filters in the op-amp stage,
allowing more low end to pass through and thickening the tone.
• Clipping (toggle switch) selects between different sets of clipping diodes which changes the
character of the drive tone.
HELIOS CLASSIC DISTORTION
10 Licensing
2