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Dave Grohl uses an MXR M-101 Phase 90 Pedal in his pedalboard. His MXR Phase 90 is hooked to both the Boss DM-2 Analog Delay pedal and th... more

In this Instagram posted by customaudioeletronics, one of John Mayer's pedalboards (the one on the left in the photo) has a MXR Phase 90 ... more

John Frusciante's MXR Phase 90 with block logo can be seen in the middle of his pedalboard (circa 2000) in this photo. more

David Gilmour replaced his Uni-Vibe in 1973 with an MXR Phase 90 and has been used in every Pink Floyd & solo record since. From the s... more

In this photo, an M-101 can be seen on the right, on Jimmy's pedalboard. This pedal is discussed further on [this website](http://www.led... more
Reviews
Trusted musician and artist reviews for MXR M101 Phase 90
Based on 82 Reviews

Classic shifter with nice analog tones. Is there really any difference between this version and the handwired 1974 model?

you have to take the Z28 mod out and that can age your pedal by years
I hated the 90s, early 2000s Nu-metal sounds of this phaser once I had it (i was replacing my MXR EVH Phase 90 which i absolutely fell in love with (i'm more of a subtle phaser guy, but i use phaser on nearly everything). I hated the sound. So i researched it and found that removing the Z28 component would alter the sound back to the subtle tones i craved. IT DID AND WAS A TRULY UNIQUE AND INSPIRING PHASE TONE IN AND OF ITSELF. It was a special sound.
But after 6 years, the tone has now gone haywire and I can barely get the thing to phase at all. What we're left with is a slightly modulating boost pedal that sounds truly unique but when you WANT A PHASER YOU NEED A PHASER....
don't get this one. if you want a Phaser, built to last, get the MXR EVH Phase 90. If mine hadn't been stolen, I would've never stopped using it. Or get the Script version, but the sound on this is half-assed from MXR.

Best, simplest phaser ever
This is an incredibly simple pedal, obviously, with the single knob controlling primarily speed, though I suspect it changes something about the resonance or feedback or something along those lines. I notice the tone of the phaser changing as the speed increases and decreases (in a good way, I mean). The only issue I've ever had with it is the volume boost that happens as soon as you turn the phaser on. I've fixed that with my pedal-switching controller now, so the output is the same when bypassed and when on. It also distorts a little with higher output guitars, but I kind of like the grit it adds to the guitar tone.

its a classic
for a long time Iw as a phase 90 dissenter, rocking small stones, a phase 45, a mutron... but I get the phase90 thing. Its dialed in just right to do a certain thing. The limited bandwidth loved distortion in a way a smalls tone doesn't.... great pedal. This is also THE phaser to put on fender Rhodes or Rhodes samples tog et the Fagen sound. Nothing else will do on a rhodes, not even a phase100. Everyone needs one. MXR really used to knock it outta the park in the 70s.

Quintessential phasing sound
Tagline just about says it. Great for solos or adding ambiance to sustained chords. Goes from slight warble to controlled chaos. The enclosure is super rugged. LED and 9V jack are great additions. Not much more to say.

Simple but effective
Not too much to say about this pedal. It's orange, it has one big, foot adjustable control, it sounds everything from subtle to immense. What's not to love. So many uses, from a little extra dynamic movement to full on screaming movement for lead work. Sounds very different depending on where in the chain you put it, or if it goes in the loop, so experiment to see what you like. Can be more dramatic in front of the preamp, or less so in the loop after your delay.

Best Phase
Best Phase of all time. Indispensable in the pedalboard.

edited about 2 years ago
Ended up with Phase90
As old saying goes: you can try all the phasers in the world, but in the end you will get Phase90.
Number one phaser in the world.

Legendary phase sound
A classic, are you gonna complain about the lack of knobs? trust me, you just need one for this pedal. Great after and before dirtboxes.
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Details
Description
This unit virtually launched the phase craze.
The MXR M-101 Phase 90 Pedal gives you classic phasing with variable speed control. Add shimmer to lead passages or jet-plane resonance to muted strumming. Not just for guitars; it works well with bass, keyboards, and even vocals. Vary the speed from a subtle, long cycle to a fast, watery warble with endless vintage vibrations in between. The MXR M-101 is powered by single 9V battery or Dunlop ECB-003 AC Adapter
Specifications
- 2-3/8"W x 4-3/8"H x 1-1/4"D
A holy grail of phase shifters
There are lots of phasers around, but somehow almost everyone ends up with Phase90. No other phaser sounds so natural, lush, warm and sits so great in the mix on cleans, overdrive or hi-gain distortions. Single knob control makes it extremely easy to use and offers lots of tones just right away - from subtle phasing to extreme psychodelic sounds.
However there is one minor flaw - current version, A.K.A. block logo has an awful volume boost which is quite annoying in some circumstances. Some people just get along with it, some do not. For those who do not a simple mod can be done - literally 5 minutes of work. Open up the pedal, find the R28 capacitor (manual on the web) and snip it. Problem will be gone, no more boost, just pure phase shifting.