For sale is a vintage Electro-Harmonix Doctor Q Envelope Follower / Auto Wah pedal, made in New York City, USA in the late 1970s.

The Doctor Q is one of Electro-Harmonix's most distinctive vintage effects, producing funky, touch-sensitive filter sweeps that respond dynamically to your playing. From subtle quack to dramatic auto-wah sounds, it has become a favorite among guitarists and bassists looking for classic analog envelope filter tones.

This pedal features the desirable early folded-metal enclosure with the black and silver finish and yellow Doctor Q graphics. The circuit board and components appear original, and I have included detailed internal photographs so buyers can inspect the electronics for themselves.

Condition:

• Tested and functioning.
• Footswitch engages properly.
• Original graphics remain bright and easy to read.
• Moderate cosmetic wear from normal use including scratches, scuffs, and edge wear.
• Hook-and-loop material attached to the bottom plate.
• Interior is clean and appears largely original.

Please review all photos carefully as they are part of the description.

Specifications

• Manufacturer: Electro-Harmonix
• Model: Doctor Q Envelope Follower
• Effect Type: Envelope Filter / Auto Wah
• Era: Late 1970s
• Made In: New York City, USA
• Controls:
• • Range knob
  • Auto/Bass mode switch
• Bypass: Mechanical footswitch
• Input: 1/4"
• Output: 1/4"
• Finish: Black/Silver with Yellow Graphics

What's Included

• Electro-Harmonix Doctor Q Envelope Filter pedal only
• No box, manual, or power supply included