Mu-Tron Phasor II Vintage Analog Phaser 1970s

No sales tax for customers outside California. 

This vintage Mu-tron Phasor II is one of the most iconic analog phasers ever made—a true piece of effects history from the same company that created the legendary Mu-tron III envelope filter. Known for its lush sweep, deep modulation, and studio-grade clarity, the Phasor II remains a favorite among guitarists, keyboardists, bass players, and producers seeking warm, musical, unmistakably vintage modulation.

This pedal has been serviced, receiving a new 12 foot, grounded AC cable.

Using optical (photocell) modulation rather than the later OTA-based designs, the Phasor II produces a smooth, organic swirl with exceptional depth and harmonic richness. Its simple two-knob layout—Rate and Feedback—makes dialing in everything from slow, syrupy movement to fast rotary-speaker-style modulation effortless. It excels in clean tones, electric piano patches, synths, and overdriven guitar lines, shining in funk, psychedelic rock, ambient, and classic studio work.

Users and collectors consistently praise this unit: “The most musical phaser ever made” (The Gear Page), “Instant ’70s studio magic” (Reddit r/Guitar), “Warmer and deeper than any modern phaser” (Harmony Central), “Optical sweep is next-level smooth” (Vintage Synth Forum), and “A secret weapon on Rhodes and Clav” (TalkBass).

The Mu-tron Phasor II has been used on countless classic records and by players seeking that unmistakable swirling vintage texture—linked to artists like Jerry Garcia, Stevie Wonder, and keyboard legends of the ’70s funk and fusion eras.

For more vintage effects and modulation pedals, explore our Vintage Gibson Guitars, Two Rock Amplifiers (New and Used), or our growing Vintage & Used Effects Pedal page. Every piece at Mahar’s Vintage Guitars is tested, photographed accurately, and described with complete honesty.

Tested in our shop prior to listing - it works great!

Shipping policy:

Shipments will require signature on delivery, no exceptions.  If there is damage, the buyer must retain all packing materials intact and picture them immediately and send them to sales@maharsvintageguitars.com.  Less than 1% of our shipments are damaged in transit, and we are committed to making sure your item arrives safely, but we are taking these additional measures to make sure you are happy with your purchase.