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Average Price: $90
Standard/Professional
$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
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
410
Legendary Fuzz
It's a classic. Brilliant for that late 80s/early 90s fuzz tone. It's thick, vibey, genuinely great pedal. It's been on my board since I bought it and I can't imagine it not being on my board. It's a go-to.
229
Big Muff on steroids
It's everything the Big Muff is but better in every way. More grit, more clarity and more sustain!!!!!!!!
Preferred Settings + Usage:
Volume at 12 o'clock Tone switch ON and Tone knob at 11 o'clock Sustaine at 9 o'clock
115
Best muff out there.
Total smashing pumpkins-esque goodness, but can also do the heavy sustain from weezer's blue and the lighter fuzz from bush's sixteen stone.
476
Pumpkin Pie
Being a huge Smashing Pumpkins fan, I love this pedal. When compared to the classic NYC reissue, this has more balls especially when you bypass the tone circuit. Build quality is solid as usually, though the sound is a one trick pony, you either love or hate Muffs. You have to play it into the clean channel, no amp gain or drive at all, unless you want the notes to choke.
Preferred Settings + Usage:
Volume - 14:00 Tone - OFF Sustain - anywhere from 13:00 to max
395
Op amp is the greatest big muff I've ever known...
Don't wait till tomorrow (to buy this pedal) Tomorrow's to far away (to wait to hear this wall of fuzz) I'll burn my ears out before I hear (another trash fuzz) I wanted more (fuzz) Than life (distortion pedals) could ever grant me Bored by the chore of saving face OP AMP Big Muff is the greatest BIG MUFF I've ever known.
268
If you grew up listening to 90s rock, you need this pedal!
I've tried quite a few pedals in my day, and still have a respectable amount on my current pedalboard. That said, this is by far my favorite way to crank up my tone. While the original was around in the 70s, this recreation was popularised by Billy Corgan of the Smashing Pumpkins and really is the sound of post-Nirvana grunge. But it doesn't end there... You can tweak this baby to play everything from Hendrix, to Neil Young, to Green Day. Really is a great pedal.
832
The Smashing Pumpkins sound in a box
I watched one demo of this with Billy Corgan playing it, bought it based on that video, and I haven't wanted a single other fuzz pedal since I first switched it on
220
GREAT SETUP!!
186
I would be lost without it
The big muff is a must have for any pedal board, it was the first pedal I ever purchased and I still keep it on almost all the time. It’s a sound that is unmatched in my opinion, and I could not recommend it more.
183
First pedal in my life.
Of course, at the time of purchase, I was influenced by Billy Corgan. Its not only great for Siamese Dream / Smashing Pumpkins tone, but its also good for grunge, shoegaze, garage rock stuff (Dinosaur Jr. , White Stripes, MBV and others ) One of the greatest modern fuzz pedals. LOVE IT!
279
Great Big Muff
For about 9 years i've had a Little Big Muff which I've loved. When i started seeing videos that EH was reissuing the op-amp Big Muff, famously used by Billy Corgan and James Iha on Smashing Pumpkins Siamese Dream album, i was intrigued. I listened to some clips, and loved the sound of it. I made it known that it was something i would like and my wife got it for me. Actually playing it i have to say, it blows my Little Big Muff out of the water. It's a tremendous sounding Big Muff pedal. To my ears the Op-Amp sounds a bit brighter, and has a bit more clarity while still giving that Big Muff wall of sound. Not necessarily ideal for drone metal, but otherwise, it's a tremendous pedal.
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.
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
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.
Community setups
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It’s a modded version of the same pedal so the sound very similar
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