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Custom made Mutron BI-PHASE clone. Made by Onkel Amps. Blue LEDs!
In 1974 Musitronics released the Mu-tron Bi-Phase: an enormous dual six-stage phaser ‘pedal’ including - for the first time on a phaser - rotary feedback control pots.
The design of the Bi-Phase once again bucked contemporary thinking with its somewhat outmoded lamp/photocell circuit (as employed in Shin-ei’s late sixties Univibe circuit). Beigel and Newman chose a photocell circuit for its wide dynamic range, but initially the results were too good, from an audio perspective. FET based phasers had a nonlinearity that produced pleasing results musically; the early Bi-Phase design was too clean and unexciting. This led Beigel to try inserting a feedback option into the phase shift loop thereby emphasising peaks where cancellation wasn’t occurring: a eureka moment that created the distinctive clean, yet ‘chewy’ Bi-Phase sound.
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