WORKING CONDITION: Excellent. All modes operate well inside this funky little beast. Both vacuum tubes create and push ample gain and rich distortion into the filter section to ensure the 'Tron-style quacks and rumbles pop out efficiently. This is one of the better envelope filter designs the world of guitar effects has seen. 

PHYSICAL CONDITION: Very Good. There are a few blemishes in the paint, but the metalwork, knobs, switch, jacks, tubes, and LED's are all in excellent condition. 

INVENTORY #59867

BRAND: Electro-Harmonix

MODEL: Tube Zipper

FUNCTION: Guitar Effects Pedal

PRODUCT DESCRIPTION: This listing is for an Electro-Harmonix EHX Tube Zipper Envelope Filter Guitar Effects Pedal. The Electro-Harmonix Tube Zipper is a legendary, permanently discontinued hybrid envelope filter and distortion pedal. Powered by two 12AX7EH vacuum tubes running at a high internal voltage, it is famous for producing wild, interactive, and highly unconventional analog tones ranging from classic auto-wah to self-oscillating synth roars.

SPECS:

• Tube-Driven Distortion Stage: The internal vacuum tubes drive the pre-amp and distortion circuitry, adding authentic tube compression, warmth, and harmonic richness that reacts heavily to your picking dynamics.
• Moving Filter Architecture: A patented moving filter section handles the envelope-following duties. It features an Envelope switch to choose between smooth up-sweeps or dramatic down-sweeps.
• Dual Performance Modes:
  • Tron Mode: The filter sweeps cleanly and smoothly, acting as a traditional dynamically responsive envelope follower.
  • Trill Mode: Introduces a low-frequency oscillator (LFO) that modulates the envelope as it sweeps, creating unique ring-modulator or tremolo-like textures.
• Self-Oscillation: When the Resonance control (Q) is cranked, the pedal enters wild self-oscillation. Musicians can actually "play" the knobs like a standalone synthesizer or theremin.
• Input Gain & Drive: Boosts the signal entering the pedal and adjusts the raunchy tube distortion applied after the filter stage.
• Sensitivity: Adjusts how responsively the filter sweeps based on your instrument's volume.
• Resonance & Frequency: Controls the peak sharpness (Q) of the filter and sets the fixed frequency when the dynamic envelope is inactive.
• Master Volume: Sets the overall output level of the pedal.
• Power Supply: 12V AC (Alternating Current), minimum 1000mA (1 Amp).
• Connector Type: Special, barrel/plug configuration with an unconventional form factor.
• Battery Power: None. Due to the high power draw required to heat the dual vacuum tube filaments, this unit cannot be powered by a 9V battery.

ACCESSORIES INCLUDED: This item comes as seen in photos and includes its original EHX power supply.

UNPACKAGED WEIGHT: 3 lbs.

UNPACKAGED DIMENSIONS: 8" x 4" x 7"