Pricing and availability
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Average Price: $134
Standard/Professional
$60
$181+
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Budget
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Price History
Based on price data from 6 merchants for "Electro-Harmonix “Op-Amp” Big Muff Pi V4". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Unleash the raw power and distinct metallic resonance of the Electro-Harmonix "Op-Amp" Big Muff Pi V4, a legend reborn from the mid-late 1970s. Straying from the traditional four-stage Muff circuit, this iconic fuzz effects pedal introduces an Op-Amp chip circuitry that delivers a unique sound palette. Perfect for those seeking a blend of vintage vibe and modern edge in their heavily distorted playing. With its classic enclosure, it's not just a pedal, but a bridge to the past, re-engineered for today's musicians.
Key Features:
- Unique Op-Amp chip circuitry for a distinctive metallic sound
- Classic enclosure design reminiscent of its V3 predecessor
- Simplified gain stage for a cleaner, more focused distortion
- Intuitive control layout with volume, tone, and sustain knobs
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) |
| Batteries | 1 x 9V (included) |
| Power Usage | 5mA |
| Height | 2.1" |
| Width | 2.75" |
| Depth | 4.5" |
FAQs
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What makes the Electro-Harmonix Op-Amp Big Muff Pi V4 different from other Big Muff versions?
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The V4 uses op-amps instead of transistors, providing a unique tonal character distinct from other Big Muff versions. This design was famously used by Billy Corgan on the Smashing Pumpkins album "Siamese Dream," known for its thick, creamy fuzz sound.
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Can the Electro-Harmonix Op-Amp Big Muff Pi V4 be powered with a standard 9V power supply?
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Yes, the pedal requires a 9V DC power supply, which is sold separately. It can also be powered using a 9V battery, which is included.
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Is the Electro-Harmonix Op-Amp Big Muff Pi V4 suitable for live performances?
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Yes, the pedal features true bypass switching, ensuring your signal remains unaffected when the pedal is off, making it suitable for live performances and studio use.
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What type of musical genres is the Electro-Harmonix Op-Amp Big Muff Pi V4 best suited for?
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The Op-Amp Big Muff Pi V4 is ideal for rock, alternative, and grunge genres, providing a powerful, sustaining fuzz tone that cuts through mixes, reminiscent of 90s alternative sounds.
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Does the Electro-Harmonix Op-Amp Big Muff Pi V4 work well with both guitar and bass?
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Yes, the V4 is designed to work with both electric guitars and basses, delivering a rich, full-bodied fuzz tone that enhances both instruments.
Videos
Prymaxe
Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer
Electro-Harmonix Op-Amp Big Muff Pi Distortion/Sustainer
Prymaxe
Electro Harmonix Op Amp Big Muff Pedal | FULL DEMO
Elliot Stent
Electro Harmonix OP Amp Big Muff (with Nano Big Muff Comparison) - Review & Demo
PMTVUK
1978 EHX Big Muff Pi (V4 IC or Op-Amp version)
Liquitone Audio Electronics
Electro Harmonix "OP-amp" Big Muff Pi - Orange OR120
andrás schóber
1977 Electro Harmonix Big Muff EH1322 Fuzz demo
basscajon
Electro Harmonix BIGMUFF Op-Amp（V4）VS Reissue（V9）
sublow326
ELECTRO-HARMONIX OP-AMP BIG MUFF PI DISTORTION/SUSTAINER PEDAL
Quimper Sound Records and Guitars
Electro Harmonix Op-Amp Reissue vs Original Vintage 1978 V4 Big Muff
Paul Reno
Electro-Harmonix - OP-AMP Big Muff Pi
MooreMusicGuitars
CASSINI REVIEW #07 - EHX Big Muff 1977
Pedro Cassini
Electro Harmonix 1978 Big Muff Op Amp v4 demo
саня санкен
Electro Harmonix Big Muff Pi V4 Op Amp
Pacific Drive - Vintage Guitars and Pedals
Zach’s Big Muff V4
Marcus Serck
Darin’s Big Muff V4
Marcus Serck
Reviews
PROS
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Delivers thick, high gain fuzz for authentic '90s grunge sound
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Unique "wall of sound" distortion compared to other op-amp muffs
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Offers classic Smashing Pumpkins tone accurately
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Features a newer jrc4558 chip for improved sound quality
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Maintains a heavy tone even with low sustain settings
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More usable and versatile compared to other fuzz pedals
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Less scooped and fizzy, ensuring it sits well in a mix
CONS
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Reissue versions may not perfectly capture the vintage pedal’s unique tones
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Reacts differently with other pedals compared to original versions
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 V4.
Features and functionality
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The EHX Op-Amp reissue includes a tone kill switch for added versatility, enhancing its adaptability beyond the standard tone.
Source -
The Op-Amp Big Muff can achieve the hot feedback levels typical of 90s grunge, comparable to tones on early Bush albums like "Glycerine."
Source -
It's noted for its ability to produce a massive, smooth sound, making it suitable for Doom and Stoner Metal genres.
Source
Mods and upgrades
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Adding a parametric EQ after the Op-Amp Big Muff allows for greater tonal versatility, enhancing its performance across various musical styles.
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Building an Op-Amp Muff into a dual box with an MXR Distortion 2 is a considered modification for tonal variety.
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Owners recommend stacking the Op-Amp Big Muff with a Tube Screamer for better clarity and to tighten low-end frequencies.
Source
Comparisons
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The Op-Amp version is noted for its higher gain compared to the Ram's Head Muff, making it more suitable for harder-edged tones.
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The Op-Amp Big Muff is preferred for its ability to cut through a mix better than other Muffs, especially in live settings with multiple guitars.
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The Made by Mike IC Muff is favored for having the least background noise among its peers, maintaining sound clarity.
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The Stomp Under Foot Pumpkin Pi provides more detailed low-end retention when layered, unlike other reissues that compress low mids.
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Users often compare it to the NYC Muff, finding the Op-Amp to be less harsh and with a unique tonal character that stands out.
Source
User experience
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A few owners find the pedal's volume output to be quieter than expected, suggesting it may require careful placement in the signal chain to avoid perceived volume drops.
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Incorporating a Strat with a BC1 neck pickup, Chopper middle, and JB bridge can replicate the desired Billy Corgan rhythm tone.
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Some users note the EHX reissue has more gain and a different bass response compared to the original, and it avoids tone suck.
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Many users report that the Op-Amp version stands out in a band context, where other Big Muff variants often get lost.
Source
Use cases and applications
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Some users pair the Op-Amp Big Muff with a Soul Food overdrive to enhance the fuzz's grit, while others find the Rat pedal useful for adding dirtiness.
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Lace Sensors paired with an Op-Amp Muff create a unique mid-range characteristic, enhancing the sound for live performances.
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The Op-Amp Big Muff can create a "compressed laser-beam" sound, especially when used with volume dimed and amp gain adjusted, ideal for certain rock styles.
Source -
Ideal for achieving 90s grunge tones, particularly for Smashing Pumpkins fans looking to replicate Billy Corgan's sound.
Source
5.0 out of 5
Based on 0 Reviews and 2 Ratings
Artist usage
Add artist
"His photo of the actual Big Muff used showing his exact settings confirmed it was a V4 op-amp (IC) Big Muff. The graphics match second edition V3 and V4 Big Muffs, but the tone and sustain pot sweep as Billy set them were only possible on a stock V4."
In an article by Amit Sharma on MusicRadar, Mick Thomson reveals his use of the Electro-Harmonix "Op-Amp" Big Muff Pi V4 pedal. He notes that this is the same version of the Big Muff utilized by Billy Corgan of the Smashing Pumpkins on the album Siamese Dream, which sets it apart from other iterations of the Big Muff.
in this video, at the timestamp 0:25 Billy Corgan talks about how he and James bought their big muffs together
In the video "Superheaven Talks Pedals" by Run For Cover Records, guitarist Taylor Madison confirms at 1:18 that he received the Electro-Harmonix "Op-Amp" Big Muff Pi V4 pedal from their drummer Zach and used it on the album "Jar".
Jon Sidel is associated with the Electro-Harmonix "Op-Amp" Big Muff Pi V4, as evidenced by its listing in the Jon Sidel Collection on Reverb.com in 2017. The pedal is identifiable by its EH1322 circuit board and absence of a "Tone Bypass" label. Notably, this chrome-colored unit, weighing 1.6 lbs, shows normal exterior wear but requires servicing due to a faulty sustain pot and missing power supply.
Album Usage
The Electro-Harmonix “Op-Amp” Big Muff Pi V4 has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Electro-Harmonix “Op-Amp” Big Muff Pi V4, it is most commonly used with the following gear.
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