MXR Phase 90 M101 — The Phaser That Shaped Rock Guitar

The Phase 90 is one of the most recognized effects pedals ever built. Heard on Van Halen's 1978 self-titled debut — all over it, from riffs to solos — this analog phaser set a standard that modern pedals still reference. It does one thing and does it exceptionally well: classic, musical phasing with zero fuss.

Key Features

• Analog 4-stage phase shift circuit
• Single Speed knob controls oscillation rate across the full range
• Sweep range from slow, hypnotic phasing to fast, intense wobble
• Modulation depth factory-tuned for musical, balanced tone
• Rugged all-metal housing built for heavy stage use
• Runs on standard 9V battery or power adapter

Ideal For

The Phase 90 is the go-to for rock, blues, and funk guitarists who want immediate, usable phasing without a learning curve. It works beautifully under chord work for a slow, spatial sweep, cuts through on lead playing with that unmistakable vintage character, and sits well in a mix without overwhelming the dry signal. If you need to nail that Van Halen-era tone or simply want a reliable phaser that never gets in the way, the M101 belongs on your board.