aion CORVUS Manual - Página 2

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1 Project Overview

2 Introduction & Usage

INTRODUCTION

The Corvus Fuzz 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 based on the 1978 revision of the Big Muff, which added a "Tone Bypass" switch. As

inferred by the name, this switch fully bypasses the tone stack for a more raw and grinding 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 configuration 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 you prefer (see build notes for details).

USAGE

The Corvus has the following controls:

• Sustain controls the amount of gain that is fed into the clipping stage.

• Tone pans between a low emphasis and high emphasis, with an overall scooped tone in the middle.

• Tone Bypass (toggle switch) bypasses the tone stack entirely, increasing the output level and giving

it a more aggressive bite.

• Volume is the overall output level.

CORVUS DISTORTION / SUSTAINER

10 Licensing

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