The story of Frank Zappa and the Mu-Tron Bi-Phase

Mu-Tron Bi-Phase
(Image credit: Eilon Paz)

Stompbox: 100 Pedals Of The World’s Greatest Guitarists features the actual pedals owned and used by the artists themselves,” explains creator and photographer Eilon Paz. “The whole project took us about four years from start to finish and was very expensive to produce, but it was a process.

The lowdown on the Mu-Tron Bi-Phase

Introduced in 1972 by Musitronics, the Mu-Tron Bi-Phase is still regarded by many as the ultimate phaser, consisting of two independent lush-sounding six-stage phasers with independent Rate, Depth, and Feedback controls, LFO wave Shape and Sweep assignment switches, and stereo Input and Output jacks. 

The two phasers can run in or out of sync with each other and be routed in series or parallel.

The pedal is powered by a hardwired 110-120-volt cord and utilises a 1 amp 3AG fuse. The Bi-Phase is controlled with a proprietary standalone dual footswitch or the Mu-Tron C-100 Opti-Pot Control Pedal.

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Rod Brakes

Rod Brakes is a music journalist with an expertise in guitars. Having spent many years at the coalface as a guitar dealer and tech, Rod's more recent work as a writer covering artists, industry pros and gear includes contributions for leading publications and websites such as Guitarist, Total Guitar, Guitar WorldGuitar Player and MusicRadar in addition to specialist music books, blogs and social media. He is also a lifelong musician.