With the simplest design, the Maxon PT999 offers you a wide range of '60s and '70s vintage sounds in the purest old-school style. All packed into a tiny blue box with a single rate control knob. The PT999 blends naturally with your clean signal (or overdriven, as you prefer) and recreates the classic clean and transparent phase effect. The key is simple. Maxon has faithfully preserved the original 1974 design. The circuit produces a 720-degree phase shift, varying from 2 to 14Hz. The PT999's FET is carefully selected and hand-assembled to ensure the lowest possible noise. Internal pots adjust the phase width with factory presets. There’s no phase shifter on the market that comes closer to the classic. It’s simple. This is the classic.