M101 Phase 90

MXR Phase-90 Phaser. This is the one-knob phaser that has, for all practical purposes, dominated all other phasers that have come before, or since...

Thermionic Studios owns four (4) Phase 90 pedals available for rental:

• Two (2) CSP101SL "Script" Phase 90s,
• One (1) EVH90 EVH-Edition Phase 90, and,
• One (1) EVHSE90 EVH-35th Anniversary Phase 90

IRONY: Despite making the article about the standard "block" Phase 90 phaser, we don't have any standard MXR Block Phase 90 phaser pedals. We have nothing against the standard block phasers, we just don't think they sound AS GOOD as the older script-logo architecture model; we don't think they offer the best sounds - we believe musicians are more partial to the sounds of the script logo pedal.

If you're attached to the block pedal sound, it's possible to use an EVH-Phase 90 with the "script" button not pressed in.

If you're interested in renting one of our Phase-90s, please don't hesitate to contact us.

Controls

Image from Jim Dunlop

• Knob 1 - "Speed":
• Footswitch 1 - "On/Off":

Bypass: Buffered

All versions of the Phase-90 - whether by the original MXR company, or from later Dunlop/MXR, have a buffered signal bypass. There is no exception.

General Information

https://www.youtube.com/watch?v=5xrBGitOIc4

Script Phase 90

Image from Jim Dunlop

EVH Phase 90

Image from Jim Dunlop

EVH SE Phase 90

Image from Stratcat.biz

The Script Button

The Eddie Van Halen 35th Anniversary version also has the "script" button. It functions in exactly the same manner.

Phase Inversion:Yes/No

Schematic ID	Electronic Part	Action	Phase State
X	X	X	X

Artists

We are currently unaware of any artists actively using the pedal now, or who have in the past.

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Additional Sources

• https://www.electrosmash.com/mxr-phase90
• https://puzzlesounds.com/blog/history-mxr-phase-90-effect-pedal/