aion HELIOS Manual
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aion HELIOS Manual

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PROJECT NAME
HELIOS
BASED ON
Pro Co RAT Distortion
EFFECT TYPE
Distortion
PROJECT SUMMARY
A distortion pedal with a very distinctive and tight mid-to-high-gain character that made it a staple in the
rigs of 1980s hard rock bands.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
HELIOS CLASSIC DISTORTION
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2018-08-22)
1

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Summary of Contents for aion HELIOS

  • Page 1 A distortion pedal with a very distinctive and tight mid-to-high-gain character that made it a staple in the rigs of 1980s hard rock bands. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). HELIOS CLASSIC DISTORTION...

  • Page 2: Table Of Contents

    10 Document Revisions 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.

  • Page 3: Parts List

    Electrolytic capacitor, 6.3mm Power supply filter capacitor. 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor. Film capacitor, 7.2 x 3.5mm Alternative for C7. No audible EQ difference between 4.7uF and 1uF and film caps have better sound quality. HELIOS CLASSIC DISTORTION...
  • Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. HELIOS CLASSIC DISTORTION...

  • Page 5: Build Notes

    While you can remove this control entirely by jumpering pins 1 and 2 of the pot, it’s recommended to keep it because it’s entirely out of the circuit when the knob is turned all the way down (full CCW). HELIOS CLASSIC DISTORTION...

  • Page 6: Schematic

    SCHEMATIC 100k 1N5817 100uF 47uF MLCC 2N5457 100kA FILTER LM308N 30pF 100pF 100kA DISTORTION HELIOS CLASSIC DISTORTION...

  • Page 7: Drill Template

    0.65, y: +1.71 ø9/32” ø9/32” CLIP x: 0, y: +1.06 FILTER SWEEP ø1/4” x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” HELIOS CLASSIC DISTORTION...

  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B HELIOS CLASSIC DISTORTION...

  • Page 9: Wiring Diagram

    GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. HELIOS CLASSIC DISTORTION...

  • Page 10: Document Revisions

    (In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.0 (2018-08-22) Initial release. HELIOS CLASSIC DISTORTION...

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