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TONEHOME - the World of Vintage Guitar Effect Pedals

MXR Phase 90 (MX-101)

made in Rochester/NY, 1981

MXR Phase 90, early 1981 non-LED version

The Phase 90 - released in 1974 - was the first pedal sold by MXR and helped launch the company. The first issue came in a simple orange enclosure with MXR's script logo. In 1977 MXR implemented the change to the current block logo. Beginning of the 80s a LED was added. Production ceased when MXR broke in 1984.


list price 1982 (Germany): 285 DM

MXR Phase 90 manual (1981)
PDF-Dokument [1.5 MB]

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02/25/2017: ToneHome is looking for an Ibanez CS-505 narrow box first issue with flying fingers side graphic. Any hint is highly appreciated. Other than that we're looking for boxed effects or just boxes for Ibanez narrow box GE-601, AD-80, CP-835, OD-850. Please submit your offers or leads here: e-mail

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