SKU: 48633500628

Electro-Harmonix OP AMP BIG MUFF Pi Distortion/Sustain Pedal

Sale price$118.17 Regular price$131.30
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Description

Electro-Harmonix OP AMP BIG MUFF Pi Distortion/Sustain PedalThe Electro Harmonix Op Amp Big Muff is a reissue of a classic fuzz pedal from the 1970s. It aims to give you the iconic and sustaining distortion of that era. Three main controls are at your disposal including a volume knob for overall level, a tone knob to shape your timbre, and of course the fuzz knob with which you can introduce sweet distortion into your signal. The original pedal relied on op amps rather than transistors to achieve its

The Electro Harmonix Op-Amp Big Muff is a reissue of a classic fuzz pedal from the 1970s. It aims to give you the iconic and sustaining distortion of that era. Three main controls are at your disposal including a volume knob for overall level, a tone knob to shape your timbre, and of course the fuzz knob with which you can introduce sweet distortion into your signal.

The original pedal relied on op-amps rather than transistors to achieve its signature, needling timbre. This pedal aims to recreate that original V4 circuit as faithfully as possible even as it adds a couple of tweaks to the design. For instance, the tone switch, which takes the tone knob out of the circuit altogether, no longer affects your overall output level. This is a departure from earlier iterations.

The Op-Amp Big Muff Pi utilizes true bypass circuitry, to keep your tone pristine when it is bypassed. The pedal ships with a 9V battery, which can be replaced by unscrewing the backplate and accessing the battery therein. It also works with a 9V AC power adapter, which is available separately.

Key Features at a Glance

Volume Knob: This sets the overall the output level.

Fuzz Knob: This knob adjusts the amount of sustain and distortion.

Tone Knob: This control facilitates a range of sounds, from high treble to deep bass. As you turn the knob clockwise, the treble increases and bass decreases.

Tone Switch: This switch removes or adds the tone control from the circuit. This switch has been improved over the original Op-Amp Big Muff, as now the volume remains the same in both positions.Bypass/Engage

Footswitch: The Footswitch toggles between effect and bypass modes.

Specs

  • Pedal Type:Fuzz
  • Inputs:1 x 1/4" (instrument)
  • Outputs:1 x 1/4"
  • True Bypass:Yes
  • 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"
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 48633500628

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HEATHER
Battle Creek, US
★★★★★ 5
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This suit was better than expected. The material was thick and durable, and it fit perfectly!
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Reviewed in the United States on May 6, 2026
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Just a person
Lexington, US
★★★★★ 5
Very nice suit, but too small
Size: X-Large, Color: Black
It's a very nice suit - but too small. Will purchase again in a larger size.
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Reviewed in the United States on June 1, 2026
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Nick c.
Chelsea, US
★★★★★ 4
Good quality and cannot beat the value you get with a suit
Size: Medium, Color: Black
I recently purchased the WEEN CHARM Men's Suits Slim Fit for my son's homecoming and I must say, I am impressed with the quality and fit of this suit. Firstly, the material used in this suit is of exceptional quality. The fabric feels soft and smooth, and it has a nice weight to it which gives it a luxurious feel. The suit doesn't feel cheap or flimsy at all. The slim fit design is impeccable. It hugs my son's body in all the right places, giving him a sharp and stylish look. The suit is tailored to perfection and accentuates his physique beautifully. I also appreciate the attention to detail in the craftsmanship. The stitching is neat and sturdy, and there were no loose threads or flaws that I could find. The suit looks like it was made with care and precision. Additionally, the suit was surprisingly comfortable. My son didn't complain about any discomfort or restriction of movement throughout the evening, which is always a plus. The only reason I haven't given it a five-star rating is because the suit did require some minor alterations for a perfect fit. Nonetheless, this is a small inconvenience considering the overall satisfaction we had with this purchase. In conclusion, I highly recommend the WEEN CHARM Men's Suits Slim Fit. It is a stylish, well-made suit that will definitely make a statement at any formal event. My son looked dashing in it and received many compliments.
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E. Shaddock
Dallas, US
★★★★★ 5
Fit like a glove and soft to the touch.
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Cool Kid
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★★★★★ 5
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