Pricing and availability
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Average Price: $89
Standard/Professional
$60
$181+
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Price History
Based on price data from 6 merchants for "Electro-Harmonix Op-Amp Big Muff Pi Reissue Fuzz". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Channel the spirit of the '70s with the Electro-Harmonix Op-Amp Big Muff Pi Reissue Fuzz, a pedal that brings the raw energy of a classic era into a modern, compact format. Revered for its distinct fuzz-laden tones, this reissue stays true to the original's iconic sound that defined the Smashing Pumpkins' legendary album, Siamese Dream. By utilizing op-amps instead of transistors and featuring three gain stages, this pedal delivers a robust, biting distortion that cuts through any mix with ease.
Designed with practicality in mind, the Op-Amp Big Muff Pi includes independent controls for Volume, Tone, and Sustain, allowing you to craft your sound with precision. A handy tone bypass switch lets you momentarily bypass the tone circuit for an unfiltered and powerful output, perfect for those moments when you need a little extra edge. The rugged die-cast construction ensures this pedal is built to withstand the rigors of live performance, while its compact size makes it a pedalboard-friendly choice.
Key Features:
- Faithfully modeled after the late-'70s Op-Amp Big Muff Pi
- Uses op-amps for a classic, aggressive fuzz sound
- Three gain stages for enhanced tonal versatility
- Compact, durable die-cast housing
- True bypass switching for pristine sound integrity
- Independent Volume, Tone, and Sustain controls
- Tone bypass switch for maximum output
- Powered by a 9V battery or standard 9V adapter (sold separately)
Product specs
| Pedal Type | Fuzz |
| Analog/Digital | Analog |
| Inputs | 1 x 1/4" (instrument) |
| Outputs | 1 x 1/4" |
| Bypass Switching | True Bypass |
| Power Source | 9V DC power supply required (sold separately) |
| Power Usage | 5mA |
| Batteries | 1 x 9V (included) |
| Height | 2.1" |
| Width | 2.75" |
| Depth | 4.5" |
FAQs
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What makes the Electro-Harmonix Op-Amp Big Muff Pi Fuzz different from other fuzz pedals?
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The Op-Amp Big Muff Pi is a reissue of the 1978 classic, known for its distinctive, aggressive fuzz tone and sustain. It features a unique op-amp design, which provides a different character compared to traditional transistor-based fuzz pedals.
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How does the Tone Bypass switch on the Op-Amp Big Muff Pi affect the sound?
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The Tone Bypass switch allows you to bypass the tone control circuit, resulting in a rawer, more direct sound with increased volume and presence. This feature is particularly useful for cutting through in live settings.
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Is the Electro-Harmonix Op-Amp Big Muff Pi suitable for bass guitar?
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Yes, the Op-Amp Big Muff Pi can be used with a bass guitar, providing a thick and powerful fuzz sound. However, some bassists might prefer to use a blend pedal to retain low-end clarity.
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Can the Electro-Harmonix Op-Amp Big Muff Pi be powered with a standard 9V power supply?
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Yes, the pedal can be powered with a standard 9V DC power supply (sold separately) or with the included 9V battery. It requires a power usage of 5mA.
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Does the Electro-Harmonix Op-Amp Big Muff Pi have true bypass switching?
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Yes, the Op-Amp Big Muff Pi features true bypass switching, ensuring that your signal remains uncolored when the pedal is not engaged.
Videos
Reverb
Billy Corgan's First Look at the Op Amp Big Muff from Electro-Harmonix | Reverb Interview
Billy Corgan's First Look at the Op Amp Big Muff from Electro-Harmonix | Reverb Interview
Reverb
Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer
Prymaxe
Big Muff Reissue Shootout - Electro Harmonix (Ram's Head, Triangle, Green Russian, Op-Amp)
We As A Company
Electro-Harmonix Green Russian Big Muff vs Op-Amp Big Muff Reissue | CME FUZZ OUT
Chicago Music Exchange
Electro-Harmonix Op-Amp vs. Ram's Head vs. Triangle Big Muff - Differences explained
Made by Miike
Electro Harmonix Op-Amp Reissue vs Original Vintage 1978 V4 Big Muff
Paul Reno
Reissue Electro-Harmonix Op-Amp Big Muff
williesguitars
Reviews
PROS
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Captures the iconic Smashing Pumpkins Siamese Dream sound
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Offers a unique and wide sound, perfect for layering guitars
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More control and clarity than a standard Big Muff
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Versatile tone with adjustable fuzz and sustain settings
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Built like a tank for durability
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Crisp tone that cuts well through the mix
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Features a tone stack bypass switch for gnarly sounds
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Responsive to different playing dynamics
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Compact size takes up less pedalboard space
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True bypass design preserves signal integrity
CONS
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Lacks the low grit growl when sustain is dialed back
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Thin and cutting, may choke on chords and note definition
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix Op-Amp Big Muff Pi Reissue Fuzz.
Comparisons
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The Wren & Cuff Eye See '78 and Made by Mike IC Muff are favorites for their similar sound to the EHX with less background noise.
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The Keeley Moon pedal is noted for a similar sound with an added EQ toggle to push mids, enhancing live performance versatility.
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The Op-Amp Big Muff is noted for being less harsh and more full compared to the NYC Big Box, making it suitable for Doom and Stoner Metal.
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The EHX Op-Amp Reissue is noted to have more gain and a different bass response compared to the original, with no tone suck and being fairly quiet.
Source
User experience
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Owners report that the Op-Amp Big Muff sounds best when paired with clean amps and can benefit from pushing levels and tone for tight, clear fuzz.
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Owners mention that the EHX Reissue is almost boutique quiet and nails the expected sound, offering reliable performance.
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One owner was so impressed with the Op-Amp Big Muff that they bought a second unit immediately to ensure they always have one available.
Source
Features and functionality
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The pedal's tone switch is highly praised for its ability to add fullness, particularly when paired with scooped Fender amps.
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The tone circuit can be turned off for a darker, gnarly yet smooth sound, favored by users for stoner and riff-based music styles.
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The Op-Amp Big Muff is praised for its ability to maintain clarity in a live band setting, unlike other Big Muffs that can get lost in the mix.
Source
Use cases and applications
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Users in stoner/desert rock bands mention its effectiveness for riffs and experimenting with octaves and drone strings to explore resonant frequencies.
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Owners find the pedal excels for synths due to its smoothness, expanding its use beyond traditional guitar applications.
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The EHX Op-Amp Reissue excels in delivering the "Siamese Dream" sound but is less versatile for other styles according to some owners.
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The Op-Amp Big Muff is described as producing a "creamy and radical" fuzz, ideal for rhythm and riffing, with the potential to sound like a more powerful version of the traditional Muff.
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The pedal is highlighted for delivering a tone similar to Smashing Pumpkins' "Siamese Dream," especially when the amp’s gain is reduced and the master volume is increased.
Source
Mods and upgrades
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Voltage starve mods are popular for achieving a gated sound with battery-like characteristics; users recommend DIY guides for implementation.
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Users suggest the Stomp Under Foot Pumpkin Pi for its detailed low end when layered, unlike other clones that compress low mids.
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Owners recommend stacking the Op-Amp with a Tube Screamer or similar overdrive pedal to tighten the low end and enhance its cut through the mix.
Source
Critic Reviews
Based on 0 Reviews and 0 Ratings
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
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