Product images are provided for reference and may not represent the exact model, configuration, or included components.

At A Glance

Input Impedance
1 MΩ
Output Impedance
10 kΩ
Signal To Noise
>96 dB
Bypass
Hardwire
Current Draw
8.2 mA
Power Supply
9 volts DC
Description

Dunlop produced the EVH90-U as a signature phase pedal in the MXR line, developed in collaboration with Eddie Van Halen. It occupied a position in the effects catalogue as a phaser unit tied directly to Van Halen's tonal identity, with cosmetic treatment drawn from his Frankenstein guitar.

The pedal offered two distinct phasing modes: a Script style and a Block style, reflecting different circuit voicings associated with different periods of the MXR Phase 90's history. Electrically, the unit operated on 9 volts DC with a current draw of 8.2 mA, an input impedance of 1 MΩ, an output impedance of 10 kΩ, and a signal-to-noise ratio exceeding 96 dB. Bypass was achieved via hardwire switching.

Owners sourcing a replacement power supply should confirm the 9V DC specification and verify polarity before use. For internal servicing, bypass switch replacement, or questions about period-correct phaser circuit behaviour, a qualified guitar technician or electronics repair specialist is the appropriate resource.

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