# Maestro PS-1A Phase Shifter

> This modulation entry consolidates documented Maestro PS-1A Phase Shifter variants, controls, settings and roles across dated guitarist pedalboards.

- Canonical page: https://pedalboardarchive.com/pedals/maestro-ps-1a-phase-shifter/
- Machine-readable index of the archive: https://pedalboardarchive.com/llms.txt
- Evidence and reconstruction conventions: https://pedalboardarchive.com/methodology/

- **Category:** Modulation
- **Types:** Modulation, Phaser
- **Also known as:** Maestro Phase Shifter, PS-1A
- **Controls:** Fast speed button, Medium speed button, Power switch, Slow speed button
- **Identification:** The model is identified.
- **Documented appearances:** 1 board, 1975

A large black mains-powered phase-shifter console with three unmistakable colored buttons for slow, medium and fast sweep rates.

## Documented boards

Each row is an observed appearance on a dated board. A position is only an observed one where that board's order evidence says so.

| Artist | Board | Date | Positions | Order evidence | Page |
| --- | --- | --- | --- | --- | --- |
| George Harrison | "Extra Texture" phase path | 1975-01-01 | 1 | Source-described | https://pedalboardarchive.com/artists/george-harrison/extra-texture-phase-path-1975/ |