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Description
The Corvus Distortion / Sustainer is a clone of the 1977-1980 “op-amp” EHX Big Muff Pi, a redesign of the classic Big Muff circuit using op-amps instead of transistor gain stages. It was designed by Howard Davis, a brilliant EHX engineer who also invented the Memory Man delay and Electric Mistress flanger as well as the Deluxe Big Muff Pi.
He was tasked in the redesign with getting a similar sound to the Big Muff, but the circuit itself bears no resemblance to the earlier 4-transistor circuit apart from the tone control. Therefore, while it was the only commercially-available version of the Big Muff for several years, today it’s seen as a fully separate circuit. (In 2017, EHX reissued this version of the Big Muff, formally adopting its formerly unofficial name, the “Op-Amp Big Muff Pi”.)
The Corvus is more specifically based on the 1978 revision, which added a “Tone Bypass” switch. As inferred by the name, this switch fully bypasses the tone stack for a more raw and aggressive sound.
The Corvus is a direct adaptation of the 1978 circuit except for the inclusion of an optional modification to the gain control, originally conceived by Analogguru. This converts the op-amp configuration into a variable gain stage, whereas the stock unit uses a fixed gain boost followed by a volume control. With this modification, the op-amp isn’t amplifying the signal any more than it needs to. However, the original version can also be built if preferred (see build notes for details).
Product specs
| Power | 9V |
| Bypass | true bypass |
| Analog/Digital | analog |
Videos
R.J. Ronquillo
Aion FX Corvus Distortion/Sustainer | EHX Big Muff Pi Clone Kit
Aion FX Corvus Distortion/Sustainer | EHX Big Muff Pi Clone Kit
R.J. Ronquillo
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