MXR Phase 90 Guitar Pedal, (Used)

The MXR Phase 90 is an analogue phaser pedal built around a 4-stage phase-shifting circuit that produces a sweeping modulation effect by shifting the phase of the guitar signal and blending it back with the dry signal. It is one of the most widely recognised modulation pedals, known for its simple control layout and immediately identifiable movement in the sound.

The tonal character is defined by a smooth, cyclical sweep that ranges from subtle movement to deep, pronounced swirling textures depending on the Speed control setting. At lower speeds it produces gentle motion that thickens clean tones, while higher settings create a more intense, liquid-like modulation that interacts strongly with distortion and overdrive.

The Phase 90 is commonly used in both clean and driven signal chains, where it adds harmonic movement and spatial depth without overpowering the core guitar tone. Its single-knob design focuses entirely on sweep rate control, leaving a consistent, warm analogue phase effect that responds predictably across different playing dynamics.