MXR Phase 90 Gold Fiftieth Anniversary Edition M101GLDMaker: MXR Model: Phase 90 Gold Condition: Brand New Description: 50 years of 90. Released in 1972 as MXRs first offering, the Phase 90 launched one of the most iconic music effects companies and established itself as the pedal by which all other phasers are judged. No matter the genre or instrument, its distinctly lush voice will elevate any musicians tonal palette. More than a phase. The Phase 90 has been a mainstay on the pedal boards of millions