WORKING CONDITION: Good. There is some barely audible clock noise that emits from the unit when the effect is engaged. This effect cannot be heard when there is actual music running through the pedal. The SWEEP and ENV settings are both lush, which is no surprise considering the Poly Phase was the brainchild of Howard Davis, inventor of the Deluxe Memoryman. 

PHYSICAL CONDITION: Good. There are some scratches on the unit, but the internal components are clean, and the pots, switches, and power supply are in good condition.

INVENTORY #58950

BRAND: Electro-Harmonix

MODEL: EH-7100 PolyPhase

FUNCTION: Vintage Effects Pedal

PRODUCT DESCRIPTION: This listing is for a Vintage 1979 Electro-Harmonix EH-7100 Poly Phase Effects Pedal. The vintage Electro-Harmonix Polyphase (specifically the EH-7100) is a rare, 6-stage photoreactive phaser produced between 1979 and 1981.

It is highly regarded for its unique combination of a lush analog phaser and an onboard envelope follower, housed in the classic large-format "trapezoid" metal chassis. Unlike standard phasers, the vintage Polyphase uses light-dependent resistors (LDRs), which contribute to its smooth, "liquidy" tone that is difficult to replicate with modern components.

SPECS:

• Dual Modes: A toggle switch on the back selects between Sweep (standard LFO-driven phasing) and Env (envelope-controlled phasing).
• Dynamic Response: In Envelope mode, the phasing sweep is triggered by your picking intensity—the harder you play, the higher the phase frequency sweeps.
• Control Layout:
  • Feedback: Adjusts resonance for a more pronounced "peaky" sound.
  • Mod Rate: Sets the LFO speed for standard phasing.
  • Env Sens: Controls the threshold for the envelope follower.
  • Env Modulation: Determines the depth of the envelope's effect.
• Outputs: Features two 1/4" jacks—a Direct Out (dry signal) and a Clone Out (effected signal).
• Power Requirements: Attached 120V AC mains cable.
  

ACCESSORIES INCLUDED: This item comes as seen in photos and does not include any accessories.

UNPACKAGED WEIGHT: 3 lbs.

UNPACKAGED DIMENSIONS: 8" x 3" x 7"