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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
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.
STRAIGHT TALK
What Stands Out
Keep In Mind
From the people who own them
Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.
Owner photos
Put yours on the record.
The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
What do you know about this one?
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
Build Your Complete System
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
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Gear Help, Handled
From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
Fit & Compatibility
- Bridge, tuner, and nut fit confirmed for your guitar
- Pickup and electronics compatibility checks
- Pedal power and amp/cab impedance matching
Mods & Upgrades
- Upgrade paths for the guitars you already own
- Wiring, routing, and hardware swap guidance
- Advice from people who actually do the mods
The Vault
- Discontinued and EOL guitars kept on record
- Specs, history, and known part compatibility
- Share your builds and mods with the community
