MXR Custom Shop Script Phase 90 – A Faithful Return to the Original

The script-logo Phase 90 sits at the top of nearly every serious pedal collector's wish list, and for good reason. The original circuit — built from MXR's founding through the late 1970s — defined what a phase shifter could sound like, showing up on hard rock records, jazz-fusion sessions, and funk classics alike. The CSP-101SL brings that exact character back, built by the MXR Custom Shop with the same care as the original.

Key Features

• Script-era Phase 90 circuit recreation, true to the late-70s original
• Ultra warm and smooth phasing with no harsh coloration
• Improved headroom and clarity compared to later block-logo versions
• Reduced midrange swell for a more transparent, mix-friendly sound
• Status LED included — a practical upgrade over the original vintage unit
• Classic smooth orange paint and script logo, period-correct aesthetic
• Built by the MXR Custom Shop

Ideal For

The Script Phase 90 is the right call for guitarists chasing authentic vintage phasing for funk rhythm work, classic rock leads, or jazz-fusion textures. It's equally at home on a gigging pedalboard as it is in a collector's display — the LED makes it actually usable live without sacrificing any of that original character.