Electro Harmonix Op-Amp Big Muff Pi Reissue

Electro Harmonix Op-Amp Big Muff Pi Reissue



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Electro Harmonix Op-Amp Big Muff Pi Reissue
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Electro Harmonix Op-Amp Big Muff Pi Reissue, Distortion/Sustainer Effects Pedal for Guitar

Despite the number of changes and advancements made in the production of Fuzz pedals over the years, discerning tonehounds find themselves being constantly drawn back to some of those vintage fuzzboxes of yesteryear. Unfortunately, the rarity of these pedals in today's market means that the price is inflated to the point of near-unaffordability, and owning one can be little more than a far-off dream for most musicians.

Recreate Those Classic 70's Muff Pi Tones!

Thanks to Electro Harmonix though, you need want no more: introducing the fabulous Electro Harmonix Op-Amp Big Muff Pi - a modern reissue of the classic late 1970's circuit of the same name - and it's available at a price that most guitarists can afford!

Faithful to the Original

For this reissue, Electro Harmonix have gone all-out in delivering the same kind of tones that the original Op-Amp Big Muff Pi was famed for. Relying on op-amps rather than transistors, and three gain stages rather than four, the new EHX Op-Amp Big Muff Pi can produce a huge, crushing Big Muff sound with more crunch, that's great for heavy rhythm playing and heavy leads.

Pumpkin Pi

One of the most famous proponents of both the original circuit and this reissue is none other than Billy Corgan (of The Smashing Pumpkins fame). Fans of Billy's will recognise the crushing tones of the Op-Amp Big Muff Pi as those used on 1993's groundbreaking Siamese Dream, Smashing Pumpkins' second album and arguably the one that helped cement them as rock legends.

New and Improved

Whilst the sounds produced by the Op-Amp Big Muff Pi are as faithful to the original as you can get - in fact Billy Corgan himself said in an interview 'The magic's still in the box, I can still get what I'm looking for!' - Electro Harmonix have added one or two practical improvements.

These enhancements include: an all-new, compact, die-cast chassis, allowing the pedal to fit snuggly onto most pedalboards, whilst being robust enough to survive life on the road; true-bypass switching, ensuring that your guitar's tone is preserved whether the pedal is in use or not; and an all-new look, with striking orange finish, allowing the pedal to stand out against the other Big Muff Pi pedals available.


  • A faithful reissue of the original classic circa 1978
  • Iconic sound and vibe that's coveted by guitarists
  • Controls for Tone, Sustain and Volume, plus a Tone Bypass switch.
  • True bypass switching for maximum signal integrity in bypass mode
  • Rugged, compact, die-cast package - pedalboard friendly
  • Ships with a 9Volt battery, also accepts an optional EHX9.6DC-200 AC Adapter
  • Dimensions in inches: 2.75 (w) x 4.5 (l) x 2.1 (h)
  • Dimensions in mm: 70 (w) x 115 (l) x 54 (h)
More Information
Manufacturer Electro-Harmonix
SKU 170908
Shipping Weight (kg) 1.000000
Effects Fuzz, Distortion, Sustain
Warranty 2 Years


We have a wide range of Delivery Options available, depending on the value of your parcel and budget. Select from our 2-3 Day Saver Service or our Next Working Day options at the Checkout.
This will include a text or email on the day of delivery giving you an exact hour window of when your gear will be with you, and the drivers name - just so you know when to turn the volume down!

  • Free Delivery Available on Selected Products
  • Weekend UK Mainland Delivery (Saturday-Sunday): £19.99
  • Small Items (Under 750g) Small items will be delivered by Royal Mail starting from 99p
  • Heavy Items (Over 30kg): Pallet Service Doorstep Delivery £65

For heavy items, courier details, out of stock products, out of area postcodes or international deliveries see our full Delivery info here.


Rather not wait in for the delivery? Don’t worry, we’ve got you…In Stock items can be ordered and paid for in-advance Online via our Click & Collect service. As long as if it's in stock at your chosen branch, you can collect the item within the hour.

Click here for more about our local Click & Collect Service.


If you and your item aren’t getting along, you have 14 days from when you receive the goods to contact our PMT experts either by phone or email to return your item.

*Please note, we cannot accept returns of:

  • Special/Custom Orders - Any order that is custom or has been personalised.
  • Products with Hygiene Seals - Microphones, any in-ear earphones, monitors, orchestral instruments with mouthpieces and any other items that touch your mouth, nose or inner ear if you have broken the hygienic seal on the packaging.
  • Software & Media - Any software or media that has been opened or registered via physical or digital means.

Click here for more information on Returns at PMT.

Online Orders

If you and your new item aren’t getting along, you have 14 days from when you receive the goods to contact our PMT Experts either by phone or email to return your item or organise an exchange for something more suitable.

Store Orders

If you've changed your mind about something you bought in-store, bring it back within 14 days of purchase and we'll be happy to exchange it for another product, a gift card or store credit.