Brand: Electro Harmonix

1978 Electro Harmonix Big Muff Pi, perfect working order, recently serviced and sounding great....Read more

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Offered for sale is this amazing vintage EH Big Muff Pi pedal in perfect working order.

This is version 4 of the Op Amp Big Muffs with the
EH1322 board - Smashing Pumpkins' Billy Corgan famously used a v4 Op Amp Big Muff - the pot codes are 1978 making this little beauty over 30 years old.
It has very few scuffs and scratches for a 36 year-old pedal (see detailed photos below).  Mojo aplenty, made in USA, built like a tank and sounding fantastic. Sonically the V4 is similar to the V3 Big Muff - the classic Muff sound, but is very ballsy - more mid-scoop and bigger bottom maybe - the Tone Bypass option (bypasses the tone circuit - not 'true bypass') is good for more aggressive, raw-sounding fuzz; there's bags of sustain and gain to be had.

It can be powered by a 9v battery (new Procell included) or EH power supply (not
included and untested with psu).
These vintage op-amp units sound far superior to the reissues in our opinion: this just oozes class and filth - try it on guitars, bass, keys - it  makes synths sound incredible...
This is a vintage pedal in good working order: please do not expect modern digital-era perfection.

Here's what Kit Rae says about the Op Amp Big Muff Sound in his definitive history of the Big Muff which can be found here:
This is a great distortion pedal with a big sound and much of the same scooped mids character of the previous transistor versions...  the op-amps are great for crushing, grungier, wall of sound material, heavy distorted rhythm playing, and heavy leads. They have a very deep crunch, flat mids, and superb deep bass control."

We are passionate about supplying high quality vintage gear to our customers and go the extra mile to ensure complete satisfaction.

Shipping discount available if paying by bank transfer.


Tax (VAT)

Some of our gear will have VAT at 20% added in the UK/EU, but a lot of it won't. This should hopefully clarify the situation but if you have any questions then please get in touch.


  • These items will have two prices visible: with and without the tax.
  • If you are buying in the UK/EU you will receive an invoice showing the tax component.
  • If you are buying these items outside the EU when you get to the check out and enter your shipping location you will be charged the ex-VAT price.
  • VAT-free sales are also possible to businesses within the EU with a valid VAT number. You will need to contact us in order to buy via this means.


    • Much of what we sell is classified as "Second Hand Goods" and so while we still pay some tax, there is no recoverable/deductible component for sales to any part of the world.
    • So, the price you see is the price you pay wherever you are.


    • Shipping charges are also subject to VAT at 20% within the UK/EU - this is included within the prices you see for shipping to those areas - it is not shown separately in the cart but will be shown on the VAT invoice you receive with your goods.

    We are very experienced at packing and shipping valuable and sensitive gear worldwide. Binson Echorecs, large valve amps, vintage synths, rare racks, and even a CS-80 or two - you name it, we've sent it and it has arrived in one piece and ready to play.


    We keep it simple: if you buy more than one item you only pay the shipping on the item that has the highest shipping cost. This is the same no matter how many items you buy together (so the more you buy together, the bigger your shipping discount). If you check all the items out all together this will be calculated automatically at checkout. However, if you make an order and then wish to add to it before it ships please get in touch and we will refund the shipping on the item(s) that are cheaper to ship.

    Note that this also allows you to purchase add on items such as transformers and other accessories, and also t-shirts and other merch, without paying any extra shipping on them.


    CAN I COLLECT MY GEAR (and save on shipping?)

    Yes! If you want to use this option either get in touch before you purchase, or contact us afterwards and we will just refund you the shipping. Note that collection is by appointment only and only during weekday office hours.



    The shipping prices for our gear vary considerably depending on the type of gear, value and destination. To see shipping costs put the item you are interested in the cart and then either use the shipping estimator or go into the check out process. Or just contact us and we'll tell you what you need to know.

    It is a fact that, with vintage items, there are going to be times when gear arrives in need of some adjustment or calibration, and some times a piece of gear that was working 100% just chooses the day after arriving for a new fault to develop. However, having been working with sensitive vintage gear for many years, we are very experienced at dealing with these occurrences and will always work with you and get the problem solved as quickly and painlessly as possible.

    Note that we have have not entered automatic shipping for every country. The countries we ship to most often will have shipping rates and we are in the process of adding more shipping fees to the check out process. But if you are looking at an item that doesn't have the fee information you need then please use the contact page or call on +44 1773 856475.

    Which carriers do we use?

    We usually use Royal Mail, UPS and DPD/Interlink - it depends on the item and destination as to which is the most economical. If you have a preference then we should be able to accommodate it (but we may need to pass on any additional costs) - just let us know what you need.

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