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MXR Phase 90

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description MXR Phase 90 Overview

Introduced in 1974 by MXR, the Phase 90 is a compact phaser effects pedal designed for electric guitar. It produces a sweeping, rhythmic modulation by shifting the phase of the audio signal, creating a characteristic whooshing sound. The pedal gained significant prominence when Eddie Van Halen used it on his early studio recordings, cementing its status in rock music history.

help MXR Phase 90 FAQ

What is the difference between the MXR Phase 90 Script and Block logos?

The original 1974 Phase 90 pedals featured a 'Script' logo and used a feedback resistor that provided a more subtle, warmer phase shift. In 1976, MXR changed to the 'Block' logo and altered the circuit, resulting in a more aggressive, pronounced 'whoosh' that cut through the mix.

What famous songs use the MXR Phase 90?

The MXR Phase 90 can be heard extensively on classic rock records, most notably on Led Zeppelin's 'Achilles Last Stand' and Van Halen's 'Eruption'. Eddie Van Halen famously kept the pedal engaged almost constantly, using its sweeping modulation to thicken his guitar tone.

Does the standard MXR Phase 90 have a speed control?

The standard MXR Phase 90 features only a single 'Speed' knob, which controls the rate of the phase shifting from slow sweeps to fast vibrato. Unlike modern, multi-knob phasers, this minimalist one-knob design forces the player to commit to a single sweeping texture per song.

Is the modern MXR Phase 9 true bypass?

The original 1974 Phase 90 pedals were not true bypass and could sometimes cause 'tone suck' when bypassed in a signal chain. However, modern reissue versions, such as the EVH Phase 90, include a true bypass switch and an internal trim pot to adjust the intensity of the effect.

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