The Electro-Harmonix Op-Amp Big Muff is an Electro-Harmonix fuzz pedal, currently around $73.29. Close alternatives include the EarthQuaker Devices Hizumitas-Pba and the Way Huge Smalls Swollen Pickle Fuzz. It pairs well with the Roland Cube Street and the Laney RB3 Richter Bass Amp.

Electro-Harmonix Op-Amp Big Muff

Electro-Harmonix · pedal

The Electro-Harmonix Op-Amp Big Muff is the late-1970s IC-based version of the Big Muff, famous as the crushing, scooped wall-of-fuzz on Smashing Pumpkins' Siamese Dream. Unlike transistor Muffs it has a more aggressive, mid-scooped, slightly gated voice with massive sustain. It suits alternative rock, grunge and shoegaze players seeking thick, saturated, layered fuzz.

What stands out

  • “It excels for layered alternative and shoegaze fuzz”

    — from the reviews

  • “The Electro-Harmonix Op-Amp Big Muff is the late-1970s IC-based version of the Big Muff, famous as the crushing, scooped wall-of-fuzz on Smashing Pumpkins' Siamese Dream”

    — from the listing

  • “it suits alternative rock”

    — from the listing

  • “Drawbacks are mids that vanish in a live mix and , but its thick, iconic fuzz is unmatched”

    — from the reviews

  • “A distinctly aggressive, mid-scooped IC Big Muff with massive sustain and a saturated, slightly gated character that built the Siamese Dream wall of fuzz”

    — from the reviews

  • fuzz
  • shoegaze
  • big muff
  • scooped
  • mix
  • massive
  • sustain
  • thick
$73.29View on Reverb

Price updated Oct 23, 2026

Genres the Electro-Harmonix Op-Amp Big Muff is commonly used in

  • Shoegaze
  • Alternative Rock
  • Grunge
  • Rock
  • Stoner Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Noise Rock
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the Electro-Harmonix Op-Amp Big Muff

Roland Cube Street

Roland

29% match
$199.99via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (scooped → mid-forward)

Roland Cube Street pushes a scooped tone toward mid-forward

Comes later in the signal chain

Laney RB3 Richter Bass Amp

Laney

29% match
$408.77via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (scooped → mid-forward)

Laney RB3 Richter Bass Amp pushes a scooped tone toward mid-forward

Comes later in the signal chain

Roland Cube Street EX

Roland

tonal match
$520.75via Reverb

Comes later in the signal chain

Feed a scooped signal into Roland Cube Street EX and it comes out closer to mid-forward

ENGL E610II Savage 120 MkII Head

Engl

tonal match
$3169.99via Reverb

Comes later in the signal chain

Stack ENGL E610II Savage 120 MkII Head on top and a scooped tone tightens toward mid-forward

Gallien-Krueger GK Legacy 4x10 Bass Combo Amp

Gallien Krueger

tonal match

Comes later in the signal chain

Stack Gallien-Krueger GK Legacy 4x10 Bass Combo Amp on top and a scooped tone tightens toward mid-forward

Ceriatone HRM 50

Ceriatone

tonal match

Comes later in the signal chain

Ceriatone HRM 50 pushes a scooped tone toward mid-forward

Gibson Dual Falcon 20

Gibson

tonal match
$2199via Reverb

Comes later in the signal chain

Gibson Dual Falcon 20 takes that scooped character and pushes it toward mid-forward

Ceriatone Overtone Special HRM Bluesmaster 50

Ceriatone

tonal match

Comes later in the signal chain

Stack Ceriatone Overtone Special HRM Bluesmaster 50 on top and a scooped tone tightens toward mid-forward

Pedals that stack with the Electro-Harmonix Op-Amp Big Muff

JHS MoonShine Overdrive

JHS Pedals

27% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (scooped → mid-forward)

JHS MoonShine Overdrive takes that scooped character and pushes it toward mid-forward

Comes earlier in the signal chain

J. Rockett The Dude

J Rockett

27% match

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (scooped → mid-forward)

Feed a scooped signal into J. Rockett The Dude and it comes out closer to mid-forward

Comes earlier in the signal chain

MXR Dyna Comp Mini

MXR

22% match
$109.99via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Put MXR Dyna Comp Mini after Electro-Harmonix Op-Amp Big Muff in the signal chain, clear of Electro-Harmonix Op-Amp Big Muff's own gain stage

Comes later in the signal chain

Pigtronix Philosopher's Tone Micro

Pigtronix

22% match
$119via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (scooped → mid-forward)

Pigtronix Philosopher's Tone Micro leans toward mid-forward, and that's a real, usable character to pair with

Comes earlier in the signal chain

Wampler Catacombs

Wampler

10% match
$266.18via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Wampler Catacombs after Electro-Harmonix Op-Amp Big Muff in the signal chain, clear of Electro-Harmonix Op-Amp Big Muff's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Catalinbread Epoch-Set

Catalinbread

10% match
$218.04via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep Catalinbread Epoch-Set after Electro-Harmonix Op-Amp Big Muff in the signal chain, clear of Electro-Harmonix Op-Amp Big Muff's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Ibanez CD5 Cyberdrive

Ibanez

tonal match

Comes earlier in the signal chain

Ibanez CD5 Cyberdrive pushes a scooped tone toward mid-forward

Ibanez WH10V2 Classic Wah

Ibanez

tonal match

Comes earlier in the signal chain

Ibanez WH10V2 Classic Wah goes in front of Electro-Harmonix Op-Amp Big Muff — a wah tracks picking dynamics best on the raw signal

Cheaper alternatives

Mooer MFZ2 Triangle Buff

Mooer

64% similarity
$49.42via Reverb

Shared character: big muff, middle, fuzz

Electro-Harmonix Nano Metal Muff

Electro-Harmonix

94% similarity
$64.08via Reverb

similar tone character

Boutique & premium upgrades

Wampler Leviathan Fuzz

Wampler

61% similarity
$149.95via Reverb

Shared character: fuzz

Way Huge Electronics Swollen Pickle MKII Jumbo Fuzz

Way Huge

57% similarity
$159.99via Reverb

Shared character: 1960s, fuzz, big muff

Mojo Hand FX Colossus Fuzz

Mojo Hand Fx

57% similarity
$159via Reverb

Shared character: big muff, sustain, mix

Black Arts Toneworks Crown of Horns

Black Arts Toneworks

52% similarity
$189via Reverb

Shared character: big muff, fuzz, aggressive playing

Black Arts Toneworks LSTR Fuzz

Black Arts Toneworks

51% similarity
$119via Reverb

Shared character: big muff, mix, fuzz

Death By Audio Fuzz War

Death By Audio

51% similarity
$173.46via Reverb

Shared character: big muff, mix, thickness

Similar charactersee all similar tone character →

EarthQuaker Devices Hizumitas-Pba

EarthQuaker Devices

70% similarity

Shared character: sustain, big muff, thickness

Way Huge Smalls Swollen Pickle Fuzz

Dunlop

68% similarity

Shared character: big muff, sustain, middle

Russian Big Muff Pi

Russian Big Muff

65% similarity

Shared character: smashing pumpkins, big muff, fuzz

Electro-Harmonix Green Russian Big Muff

Electro-Harmonix

65% similarity
$76.22via Reverb

Shared character: big muff, sustain, mix

Electro-Harmonix Triangle Big Muff Pi

Electro-Harmonix

64% similarity
$92.08via Reverb

Shared character: 1960s, big muff, sustain

JHS Pedals JHS Muffuletta

JHS Pedals

64% similarity

Shared character: big muff, sustain, mix

See all alternatives to the Electro-Harmonix Op-Amp Big Muff (cheaper + boutique) →

Questions people ask

What are good alternatives to the Electro-Harmonix Op-Amp Big Muff?+

The closest matches in character are the EarthQuaker Devices Hizumitas-Pba, the Way Huge Smalls Swollen Pickle Fuzz, the Russian Big Muff Pi. Budget picks: Mooer MFZ2 Triangle Buff, Electro-Harmonix Nano Metal Muff. Boutique upgrades: Wampler Leviathan Fuzz, Way Huge Electronics Swollen Pickle MKII Jumbo Fuzz, Mojo Hand FX Colossus Fuzz.

What pairs well with the Electro-Harmonix Op-Amp Big Muff?+

Strong matches from rig and tone-complementarity evidence: Roland Cube Street, Laney RB3 Richter Bass Amp, Roland Cube Street EX — Roland Cube Street pushes a scooped tone toward mid-forward.

How much does the Electro-Harmonix Op-Amp Big Muff cost?+

Around $73.29 (live listing price, updated Oct 23, 2026).

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