Very good condition. Full working order following a deep Soundgas overhaul. Complete with our own custom foot switch which replicates the C-100 Opti-pot.

PRICE INCLUDES 20% VAT FOR UK ONLY - BUYERS OUTSIDE THE UK PLEASE USE BEST OFFER TO BUY AT TAX-FREE PRICE OF £2,350. Please note that this is separate to any VAT or import charges you may be charged - please contact your local tax authorities if you need more information about possible charges.

Mu-Tron Bi-Phase for sale following a deep Soundgas overhaul.

Supplied with our custom double switch. This has an expression pedal socket so you can access the phaser sweep capability that normally requires the rare C-100 Opti-pot (knob on the side allows you to adjust the sweep range).

For UK/European buyers we will replace the internal transformer so it runs on 220/240v supplies. We’ve also replaced the captive mains cable with an IEC socket since the photos were taken.

We have to go deep on these to do our best to keep them running including fitting new socketed ribbon cables (future reliability/ease of servicing)Fully recapped and ready for the next decade or two.

We love a Bi-Phase (it’s in our top three phasers for sure) and we’re not alone: not only are they a staple effect of many dub reggae producers (Lee Perry most notably), but they’re widely-used with guitars/synths/keys etc in a wide variety of genres. A truly legendary effect, essentially it is two of Mike Beigel’s optical phaser circuits (aka the Phasor II) in one housing, with ability to route the output of one through the other, and link, or not, the sweep rates. Note that you can also use each phaser separately.


Condition: Very good with the usual scuffs and dings to the metal work. Mains IEC socket fitted. Please see photos or get in touch if you require more information on condition.

Voltage: Will be set up for either 120 or 240v operation before shipping.

PRICE INCLUDES 20% VAT FOR UK ONLY - BUYERS OUTSIDE THE UK PLEASE USE BEST OFFER TO BUY AT TAX-FREE PRICE OF £2,350. Please note that this is separate to any VAT or import charges you may be charged - please contact your local tax authorities if you need more information about possible charges.

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We're Soundgas, the famous vintage gear specialists. We list new gear every week - visit our store & add us to your favourites list now.

We are honest and thorough in our descriptions: see our flawless feedback and buy with confidence.

If you have any questions, please do not hesitate to ask before bidding.

Please read our conditions of sale in full as they form part of the contract of sale. 

Photographs are of actual item for sale.

Thanks for looking.

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More about who we are & what we do:

Soundgas developed from an interest in sourcing vintage instruments and recording gear for our own studio and is now a thriving international business supplying top professional musicians, artists, composers and studios.

Our workshops, office and studio are located deep in the Derbyshire hills. Our tech department is headed by Huw Williams aka Dr Huw, and James Walker with with a team of in-house techs and independent specialists to ensure that everything we sell is working correctly and should continue to do so for years to come. 

Our Instagram feed (@soundgasltd) is the place to see our demos, our own products based on the Grampian Type 636 and plenty of demos of old and new gear.

With over 15 years' trading on Ebay and 100% positive feedback over many (mostly delicate vintage synths/gear) transactions worldwide, we understand how to safely deliver your precious new purchase.

Soundgas customers value our commitment to excellence and attention to detail (and our love of cool, strange and oddball vintage gear) . We have many years' experience sourcing, servicing and sending delicate vintage items worldwide and customer satisfaction is guaranteed.

We are honest and thorough in our descriptions: see our flawless feedback and buy with confidence.