MXR M101 Phase 90 Pedal

Plug in and freak out. The M-101 Phase 90 adds a shimmery velocity to leads or a dramatic swoosh to muted playing, and works well for many instruments.

The MXR M-101 provides classic 4 stage phasing sound with continuous variable speed control. Phase 90 fixed regeneration level adds intensity and is particularly effective for keyboards. This device has found its way into many of Eddie Van Halen's recordings, adding a shimmery velocity to lead passages or a more dramatic swoosh to muted strumming. The M-101 phaser is not just designed for guitars; it works well with basses, keyboards, and even vocals and appears in all of these guises on Dweezil Zappa's Z album, 'Music For Pets,' which reveals its flexible and hip nature.


- Foot accessible speed control knob
- LED on/off indicator
- Powered by the Dunlop ECB03 (earlier versions use ECB02) AC Adapter and/or 9 volt battery

Check out our overview of the MXR M101 Phase 90 Pedal:

See the classic Phase 90 in action in this video from MXR:

Dimensions: 4-1/4 x 2-1/4 x 1-1/4 in.

Weight: 0.9 lbs.

Color: Orange
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 1.04 lbs
Shipping Dimensions: 6 x 4 x 3 in
Manufacturer Part Number (MPN): DUN M101

For support or warranty questions, please contact the manufacturer:
Phone: 707-745-2722

Reviewers gave this product an overall rating of 5 out of 5 stars. (88 ratings)
Submitted November 9, 2021 by a customer from

"MXR M101 Phase 90 Effect Pedal"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
This is the one to own. Nice analog sound from the '80s too. Simple/Stupid set up. Set it and forget it. Very quiet too I might add. Powered by a 9V battery too which I really like. I don't care for any extra spaghetti to tend with on stage. I use mine for my Martin/Guild 12 string acoustic guitars for certain passages of the songs I perform. It is sweeeeeeeeeeeeet!! Also built like a German tank and I'm sure over the road it will hold its own. Very nice addition to my pedal board.
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