Mojo Hand FX 1979 Op Amp Fuzz


Mojo Hand FX 1979 is a high gain Big Muff op-amp style pedal similar to those manufactured during the late 70s. Favored by many players for its outrageous grungy distortion (most notably Billy Corgan),

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Mojo Hand FX 1979

Say “hello” to the Mojo Hand FX 1979! An evolution of the now discontinued Mojo Hand FX 1978, the 1979 is based on the notoriously high gain Big Muffs that were manufactured during the late 70s. Favored by many players for its outrageous grungy distortion (most notably Billy Corgan), it features op-amps instead of the traditional transistors found in every other Big Muff variant.

The 1979 features a footswitch to bypass the tone knob, so you get ALL the bass, ALL the treble, and a HUGE helping of extra mids and volume.

Perfect for slamming your amp into a ripping solo, or doom/stoner mode. But most importantly, the tone bypass has its own volume knob so you can set it to unity or boost! We also adjusted the taper of the original gain pot to have a more usable sweep.

This peculiar Muff uses an IC, instead of the traditional transistor set, resulting in something that’s both familiar and different at the same time. The sound is more raw and aggressive than a typical BMP. Please do not expect subtlety.

This pedal does not “clean up well” with your volume knob. It doesn’t sound pretty. It’s probably not appropriate for waltzes or jazz standards. It’s not supposed to be. It smashes you in the face.


Like all Mojo Hand FX products, this pedal is housed in a sturdy, die-cast aluminum enclosure with professional powder coating and printing.


  • Tone Bypass Level (volume with tone circuit bypassed)
  • Level (volume with tone circuit engaged)
  • Tone
  • Gain
  • Left stomp switch bypasses/engages the tone circuit
  • Right stomp switch bypasses/engages fuzz circuit
  • True bypass

-Standard center negative 9V DC supply (not included)
-Current draw: ~8mA

-4.7″ L x 3.69″ W x 1.37″ H

“I have tried and compared many Op-Amp Muff clones and the 1979 is head and shoulders above the rest.

Keep up the good work!”

Derrek C.

Additional information

Weight 0.5 kg
Dimensions 12 × 9.5 × 4.5 cm
Analogue or Digital



Orange, White


8 mA




1979 Op Amp Fuzz

Pedal Type


Power Connection Type

Centre Negative

Silicon or Germanium





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