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Average Price: $89
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$60
$181+
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Based on price data from 6 merchants for "Electro-Harmonix Op-Amp Big Muff Pi". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Introducing the Electro-Harmonix Op-Amp Big Muff Pi - a faithful reissue of the coveted late-'70s classic, designed to deliver the iconic fuzz effect at a pocket-friendly price. This compact pedal leverages op-amps rather than transistors and three gain stages instead of four to generate its signature sound. Adored by many, including Billy Corgan of the Smashing Pumpkins, the Op-Amp Big Muff was a significant component of the band's unique sound in their 1993 album, Siamese Dream.
This reissue retains the magic of the original while being encased in a robust, die-cast chassis. It also incorporates practical enhancements such as true bypass switching, preserving your tone when the pedal is not in use. The controls for volume, tone, and sustain allow you to quickly dial in the fuzz-laden and explosive textures your music demands. An additional tone bypass toggle temporarily circumvents the pedal's tone circuit for maximum output and aggression.
Key Features:
- Faithful reissue of the late-'70s op-amp Big Muff Pi
- Utilizes op-amps and three gain stages for its unique sound
- Compact, die-cast chassis for improved durability
- True bypass switching to preserve tone when not in use
- Independent volume, tone, and sustain controls
- Tone bypass switch for added power
- Powered by a 9-volt battery or standard 9-volt adapter (sold separately)
Owner's manual
Electro-Harmonix Op-Amp Big Muff Pi User ManualProduct 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 is the main difference between the Electro-Harmonix Op-Amp Big Muff Pi and traditional Big Muff pedals?
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The Electro-Harmonix Op-Amp Big Muff Pi uses operational amplifiers instead of transistors, providing a distinct, aggressive fuzz sound with enhanced sustain, which is different from the traditional Big Muff's smoother, more rounded tones.
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Is the Electro-Harmonix Op-Amp Big Muff Pi suitable for playing alternative rock?
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Yes, the Electro-Harmonix Op-Amp Big Muff Pi is ideal for alternative rock, offering a powerful and gritty fuzz sound famously used by artists like Billy Corgan of The Smashing Pumpkins.
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Does the Electro-Harmonix Op-Amp Big Muff Pi have true bypass?
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Yes, the Electro-Harmonix Op-Amp Big Muff Pi features true bypass switching, ensuring your guitar signal remains unaffected when the pedal is turned off.
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Can the Electro-Harmonix Op-Amp Big Muff Pi be powered with a battery?
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Yes, the Electro-Harmonix Op-Amp Big Muff Pi can be powered using a 9V battery, which is included with the pedal, or with a 9V DC power supply (sold separately).
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How does the Electro-Harmonix Op-Amp Big Muff Pi handle dynamic playing?
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The Electro-Harmonix Op-Amp Big Muff Pi responds well to dynamic playing, delivering a consistent fuzz tone while allowing for expressive control through your playing technique.
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
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
EHX Big Muff Op Amp vs 1978 Big Muff
shnobel
![Video thumbnail for Electro-Harmonix Op-Amp Big Muff Pi [Bass Demo] by Patrick Hunter](https://img.youtube.com/vi/f6RaH2K036E/mqdefault.jpg)
Electro-Harmonix Op-Amp Big Muff Pi [Bass Demo]
Patrick Hunter
Electro Harmonix Op Amp Big Muff - Reissue vs 1979 Original vs Classic
Absolute Music
Electro-Harmonix Op Amp Big Muff - Demo
AJ Olsen
Electro-Harmonix - OP-AMP Big Muff Pi
MooreMusicGuitars
EHX Big Muff Pi OP Amp Sound Demo (no talking) with SH-01a, Medusa and Minilogue
Bonedo Synthesizers
EHX Op Amp Big Muff Reissue (Bass Demo)
-vids-removed-
Electro-Harmonix Op-Amp Big Muff Pi vs Vintage 70’s Op Amp Big Muff
C&M Music Center - Hattiesburg MS
Mustang + EHX Op-Amp Big Muff Jam
Jafro Music Projects
Reviews
PROS
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Achieves iconic Smashing Pumpkins Siamese Dream tone
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Affordable price point for the quality and features offered
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Crisper tone than other versions, pleasing to the ear
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EQ profile provides a nice thick low end
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Offers more control and clarity with the op-amp
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Solid build quality; durable and compact
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True bypass feature preserves signal integrity
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Versatile; fits various music styles from grunge to psychedelic
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Moldable fuzz tone; wide variety of sounds with knob adjustments
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Works well with tube amps for enhanced tone
CONS
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Does not chug; not suitable for certain metal styles
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Buzziness in distortion may not appeal to all
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Limited to a distinctive sound; could be a one-trick pony
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Some may find it lacks low-end grit at lower sustain settings
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Can choke on chords and note definition with high gain settings
Critic Reviews
5.0 out of 5
Based on 23 Reviews and 99 Ratings
It is a Big Muff. Muff said.
Like pretty much everyone else, I got this at the height of my Smashing Pumpkins phase, but it's stayed on my board ever since. Perfect kick-up when you already have distortion going and want to cut through without just throwing on more excessive loudness (though it will very much do that too if you wish). I've tried a couple other Big Muffs and stand by this as my favourite, but there is something to be said for it's limited number of tones - if you ever grow tired of its distinctive sound, you can't really do a lot to change it without involving other pedals.
Preferred Settings + Usage:
Somewhat controversially I like using it with the volume pushing a low wattage solid state to get that rumbly, Eruptor sound. Don't think it's supposed to do that though (don't tell Mike)
131
Fantastic.
Really helps get a thick fuzz and a nice booming switch from clean to sweet, dirty, and powerful fuzz.
Preferred Settings + Usage:
Sustain at Max, Volume at 1:00 and the tone somewhere between 12:45 and 2:00. Really exact but anything there will be awesome, and a mix of sweet thickness and some gnarly clarity.
351
If you like hard grunge it will be the one
Great fuzz pedal that if you want tones like smashing pumpkins, alice in chains, nirvana, etc. it will be ideal. If you are looking for something different there is a wide range of big muff.
706
The THICC Boi
One of my favourite fuzz pedals of all time. Thick, very capable of saturation, but can also cut through a mix very well.
Preferred Settings + Usage:
Vol: 2:30-3:00 Tone: 9:00-10:00 Sustain (gain): Turn up until full saturation is reached (usually about 2:00, depending on what else is on the board/amp).
148
THIS PEDAL IS MAGIC!
Cannot recommend this enough if you love the sound of early Smashing Pumpkins this is the go to. Huge rich fuzz tones that make me giddy every time I hear them. Whenever I plug in and play this pedal it makes me want to create music and gives me that feeling I had when I first started to play guitar. DO YOURSELF A FAVOR GET THIS PEDAL!
165
oh the crunch
Can't really tell anything about the usage in hendrix-like music. But it is surely great for some destruction, especially with the op amp on. Also would work well in some stoner metal stuff
144
A modern take in a classic tone
This orange-color fuzz gives a nice gain color to your chain. It makes a nostalgic old-smashing pumpkins vibe that no one could resist
296
A thing of beauty
This pedal is a thing of beauty. Was looking to get a Big Muff for a pedalboard I was putting together and after seeing the Billy Corgan demo of the Op-Amp I had to have it. Here's a demo I recorded for music page a few months back (apologies for the dodgy camera, my phone was kinda broken at the time!)
277
Great big muff
my mom got me one used like new off of amazing for 89 bucks, and it is amazing. When I run it at the same time as my DS-1 or Green Russian it is amazing. I 100% recommend.
277
also, all of my current albums (the covers, hell unleashed in Wichita, and whatever album Western Nights pt2 [I cannot remember]) I have not used this as they are all done on GarageBand, but plans for Hell Unleashed in Witchita Pt2 will have me using the iRig and I will use it on that or any electric demo tapes with this big muff.
225
Loving it.
Really loving this fuzz at the moment. It gets a wide variety of tones, from over-the-top blazing fuzz to more subtle pushes of tone. They got a lot of things right here.
Artist usage
Add artist
He was involved in the making and promotion of this reissue pedal (the orange color is probably a reference to Smashing Pumpkins) with Electro Harmonix. He used his Op Amp Big Muff to get the Siamese Dream sound, so a standard Big Muff won't quite get the same sound. It'll get you close, but the Op Amp version is the one you want if you're trying to get the same gear he used. This video shows him using the pedal & talking about it.
In Gerard Way's "Fuzz Wars" series on Instagram, he writes this:
I believe this is a reissue of a vintage Big Muff like the one Billy Corgan used on Siamese Dream. I’m using this quite a bit lately.
In this photo shared on the official M83 Twitter and Instagram accounts on March 24 2023 taken during rehearsals for the Fantasy tour, an Electro-Harmonix Op-Amp Big Muff Pi can be seen on the pedal board.
Mentioned in the article interview by Guitar World 02/11/2020
"From here the signal goes to a JHS Morning Glory (“That’s my second, more-distorted kind of rock ’n’ roll sound. I used to have a Soul Food. I really liked the Soul Food, I have no idea how Carlos ended up having it”) before heading into a ProCo Rat or Electro-Harmonix Op-Amp Big Muff. “I’ve started using fuzz on a few songs. I like how it sits in the mix more than distortion for some tracks.”
EHX BigMuff Pi OpAmp can be seen on the middle right end of the board based from this photo of Jessy’s board taken from Men I Trust’s show on 10/29/2021.
Photo of Thomas Erak's pedalboard on r/guitarpedals - note, this is a Kinnatone modded version
In an Instagram post, Grant Nicholas is pictured with the Electro-Harmonix Op-Amp Big Muff Pi, highlighting its role in his recording setup.
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In this photo taken from this Instagram https://www.instagram.com/p/C9UIWpttPRX post posted by @victoryampsuk we can see the Electro-Harmonix Op-Amp Big Muff Pi
This was on Tom's live board in Seattle at the Dec 2019 show at the Showbox.
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This pedal can be seen on Kevin's board in this instagram post.
Album Usage
The Electro-Harmonix Op-Amp Big Muff Pi 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, it is most commonly used with the following gear.
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