The Phase 90 was the first pedal sold by MXR and helped launch the company in 1974. The original model had a simple orange enclosure with a script style MXR logo. In 1977 MXR changed its logo to a block style. There was a transitional period in which some Phase 90s with script logos had box logo circuits, and vice versa. Production ceased when MXR went bankrupt in 1984. When
Jim Dunlop bought the MXR brand, production resumed. The Dunlop models have an LED to indicate the effect is engaged, and an optional
AC power supply. There are several styles, including the standard block logo version, a reproduction of the script logo version, and an
Eddie Van Halen signature model. Van Halen first heard
Robin Trower use the pedal in the mid-1970s, and used it on songs such as "
Eruption", "
Atomic Punk", "
Ain't Talkin' 'bout Love", "
Everybody Wants Some!!", and "
Drop Dead Legs". The 1974 Hand Wired Phase 90 is a recreation of an original 1974 pedal using
new old stock (NOS) electronic components. ==Description==