Electro Harmonix Op Amp Big Muff Pedal

4 In Stock

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stock availability
1 at our Guildford Store
3 at our off-site Warehouse
Want to Click and Collect or try items at our Guildford Store?

The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.

The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.

Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose click and collect as your delivery option online or, during store opening hours, call our sales team at 01483 456777 to place a 10% deposit.

If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.

Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.

If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.

Please be aware that, unless you have paid a deposit to reserve the item, it will continue to be free, both online and in-store, for another customer to buy. Therefore we would advise you to place a 10% deposit by either using the on-line click and collect service or calling us 01483 456777.


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Product Description

The Big Muff is an iconic pedal. Many versions of this classic stompbox have been created since its introduction in the 70s, and Billy Corgan of The Smashing Pumpkins is arguably the most-renowned user of the Electro Harmonix Big Muff. Pioneering the huge, engulfing "wall of fuzz" sound that defined the groundbreaking Siamese Dream album in the mid-90s, Corgan relied on a particular iteration of the circuit to attain that massive sound - the V4.

Known as the Op-Amp Big Muff, rare originals of this pedal have sold on the second-hand market for hundreds of pounds. And whilst tone-chasers have worked extremely hard to replicate his legendary sound, Electro Harmonix have listened to fans and given us a pedal that delivers Corgan's tone in a compact stompbox at an affordable price!

Collaboratively designed with the man himself, the Op Amp Big Muff has all the hi-gain, saturated goodness that fans have tried to emulate for almost 25 years. With the 3 classic controls you'd expect to find on most Big Muffs (Sustain, Tone and Volume), you can carefully craft your optimal fuzz sound. Rolling in more top-end cut the higher you turn it up, you can also bring in some sub-octave warmth when you set it lower.

So today is your chance to turn your quiet rig into one that can send you into the stratosphere like a spaceboy in a rocket. With this pedal, rock like a cherub!

Here's what Electro Harmonix say about the Op Amp Big Muff Pedal:

With original late-70s Op-Amp Big Muffs selling for exorbitant prices, Mike Matthews decided to take the power to the people and reissue the classic pedal at a price that players could afford! The circuitry of the new Op-Amp Big Muff —sometimes also referred to as the IC or V4 Big Muff— has been faithfully re-created while several practical enhancements have been added including a compact, die-cast chassis and true bypass switching.

“The Op-Amp Big Muff was popularized by the brilliant Billy Corgan, who first used it on the Smashing Pumpkins’ epic 1993 album Siamese Dream. After he was videotaped playing and talking about the reissue, Billy stated: ‘The magic’s still in the box, I can still get what I’m looking for!’” - Mike Matthews

The pedal relies on op-amps rather than transistors and three gain stages rather than four, to create its signature sound. It’s a sound that’s been described by noted Big Muff collector and historian, Kit Rae, as: “a huge, crushing Big Muff sound with more crunch… great for grungy, wall-of-sound distortion, heavy rhythm playing and heavy leads.”


  • A faithful reissue of the original classic circa 1978
  • Iconic sound and vibe that’s coveted by guitarists
  • Controls for Tone, Sustain and Volume, plus a Tone Bypass switch.
  • True bypass switching for maximum signal integrity in bypass mode
  • Rugged, compact, die-cast package… pedalboard friendly
  • Ships with a 9Volt battery, also accepts an optional EHX9.6DC-200 AC Adapter