The MXR Phase 90 is a legendary analog phaser pedal introduced in 1974, renowned for its rich, swirling tones and straightforward design. Featuring a single Speed knob, it allows players to dial in everything from subtle shimmer to dramatic swooshes. Its four-stage phasing circuit delivers a smooth, musical effect that has become a staple on countless pedalboards.
 
The Phase 90's compact, durable orange enclosure made it a roadworthy choice for musicians. Notably, it was a key component of Eddie Van Halen’s sound on tracks like “Eruption” and “Ain’t Talkin’ ‘Bout Love,” and has been used by artists such as David Gilmour, Matt Bellamy, and Robin Trower . Today, the Phase 90 remains a go-to phaser for guitarists seeking classic analog warmth and simplicity.​