Unleash the power of two legendary circuits in one pedal.

The Motherload by Crazy Tube Circuits combines the tight, aggressive distortion of the Rat with the rich, sustaining fuzz of the Big Muff, giving players the ability to switch between classic tones or blend them together for unique sonic textures.

Key Features

• Two Distinct Circuits – Choose between:

  • R Circuit – Inspired by the Pro Co Rat, delivering tight, aggressive distortion with a variable low-pass filter.

  • M Circuit – Modeled after the Electro-Harmonix Big Muff, offering rich fuzz with enhanced sustain.

• Independent EQ Controls – Each circuit features its own Tone (M) and Filter (R) controls for precise shaping.

• Voice Control (M Circuit) – Cycle through multiple Big Muff voicings, adjusting midrange response.

• EQ Link Function – Activate EQ Link to blend both circuits’ EQ sections, unlocking new sonic possibilities.

• True Bypass Switching – Preserves signal integrity when disengaged.

• Compact & Pedalboard-Friendly – Designed for easy integration into any setup.

Specifications

• Power Requirement: 9V DC center-negative

• Circuit Type: Analog

• Distortion/Fuzz Modes: Rat-style (R) & Big Muff-style (M)

• Controls:

  • Volume & Gain – Adjust output level and saturation.

  • Tone (M Circuit) – Shapes frequency response.

  • Filter (R Circuit) – Variable low-pass filter.

  • Voice (M Circuit) – Cycles through different Muff voicings.

  • EQ Link – Blends EQ controls across both circuits.

• Bypass Type: True Bypass

• Dimensions: