Mu-Tron Phasor

” Mu-tron Phasor simulates a rotating, moving, spacial sound that was once obtained only mechanically with speakers or with expensive studio equipment. It gives you greater depth, intensity and variation than other electronic devices because of new circuitry with much superior dynamic range and uniformity of characteristics. And without distortion.

What does the Mu-tron Phasor do? How does it work?

Every musical signal is made of a number of different spectral components. The Mu-tron Phasor periodically varies the length of delay of a time-delayed signal and re-combines it with the original signal. This is the effect known as “phasing”. It is the result of the auditory sensation of a sweeping series of reinforcements and cancellations of the frequency components of the signal itself. The ear’s perception of the sweeping cancellation and reinforcement, together with the slight frequency vibrato caused by the varying of the delay time, is the “spacy” signal that the Mu-tron Phasor produces.”

– From original Musitronics Phasor ad circa 1970s


  • Depth L/M/H controls the depth/amplitude of the modulation (the size of the range in which the effect sweeps)
  • Speed controls the speed/rate of the LFO wave that controls the effect


  • Input Impedance: 390k ohm, unbalanced
  • Output Impedance: 600 ohms, unbalanced
  • Signal Handling Capability: 1V RMS, 2.8V P-P
  • Phasing Rate: 0.16Hz to 12Hz, continuously variable
  • AC  Power Requirements: 115V AC, 60Hz, 5 watts
  • Weight: 3¾ pounds
  • Dimensions: 8¾” l.  X  5″ w.  X  3⅛” h.


Brad Linzy’s Phasor Demo

Original Owner’s Manual: