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Photo of MXR Phase 90 (R28 Mod) and more gear in a pedalboard, studio, and signal chain

Photo of MXR Phase 90 (R28 Mod) and more gear

MXR Phase 90 (R28 Mod)

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Find out who is using MXR Phase 90 (R28 Mod)

8 community setups

2 wishlisted

23 saved

Page last updated Apr 10, 2026

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Description

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Full R80 mod without switch like other mods

Product specs

Power	9V
Bypass	true bypass
Analog/Digital	analog
Mono/Stereo	mono

Videos

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Mike Bradley

Modifying My MXR Phase 90 (R28 Mod)

Mike Bradley

MXR Phase 90 M101 demo (studio quality) R28 MOD

Alexandre St-Louis

MXR Phase 90 in depth + R28 MOD to sound like the vintage SCRIPT LOGO

Redbunker

MXR Phase 90 - R28 Mod

Simon Yung

MXR Phase 90 (R28 mod) stock v mod

Darren Meechan

MXR Phase 90 r28 mod

donozonbaltazar22

MXR phase 90 R28 Mod

nobee stonefields

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR Phase 90 (R28 Mod).

Mods and upgrades

1 0

Cutting the R28 resistor is confirmed to reduce distortion while retaining some boost in the MXR Phase 90.
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Some owners suggest using a trim pot to replace R7 for achieving unity gain, offering an alternative to cutting resistors.
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Implementing a DPDT on-on switch allows toggling between the original and modded sound for versatility without permanent changes.
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User experience

1 0

Owners who completed the R28 mod report improved sound quality with less clipping, enhancing the pedal’s overall performance.
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Setup and maintenance

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Removing the knob may require caution; some have encountered a locking nut preventing easy removal.
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Desoldering the resistor instead of cutting allows for easy reversal of the mod, preserving original components if needed.
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Use cases and applications

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Placing the Phase 90 before overdrive can reduce level issues, providing a smoother, less harsh phasing effect.
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Features and functionality

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Users report the Phase 90's volume can fluctuate frustratingly during live shows, influenced by the speed knob settings.
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Comparisons

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For those considering alternatives, the Phase 95 offers a script switch and 45/90 modes, providing four distinct phasing options.
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Value and pricing

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Owners suggest purchasing a used Phase 90 for modding, minimizing potential loss if the mod doesn't meet expectations.
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5.0 out of 5

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Artist usage

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Jesse Carmichael

Singer, Guitarist

Maroon 5

Verified via Photo

Jesse Carmichael used an MXR Phase 90 run as an insert to his Rhodes for Maroon 5’s 2005 Headlining Tour, as confirmed in the January 2005 issue of Keyboard Magazine.