Electro-Harmonix OP AMP BIG MUFF Pi Distortion/Sustain Pedal
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:
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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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Lily Pointer
Lexington, US
★★★★★ 4
Nice tray
Color: Black
We use the tray on our end tables for pen, paper, clippers etc.
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Reviewed in the United States on May 4, 2026
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Darlene S.
Boise, US
★★★★★ 5
Great Tray
Color: Black
Very nice. A little larger than expected, but turns out like the size!
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Reviewed in the United States on April 29, 2026
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Colorado great-gran
Phoenix, US
★★★★★ 5
Now hubby has a designated spot for his 'stuff'.
Color: Brown
Perfect size,nice looking, just snaps together.
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Reviewed in the United States on May 29, 2026
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Copascribe
Waukegan, US
★★★★★ 5
No more lost fidgets
Color: Brown
My son has a million fidgets to help him focus and this is a great tray to store them in and keep them in one place. Looks very pish posh for what it is and adds a nice bit of decor to his desk without looking juvenile.
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Reviewed in the United States on April 15, 2026
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Jeanne Carlin
Belleville, US
★★★★★ 4
Quality valet tray, darker brown
Color: Brown, Color: Brown
Sizing is as described and it is sturdy and well-made, but color is not quite as shown in the product images, more of a darker brown.
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Reviewed in the United States on March 24, 2026

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