This is a Zipper, an Electro-Harmonix envelope follower that was produced for a relatively short period of time.
This vintage effects pedal was probably produced from 1979 to 1980.
It is believed to be the original model of the electro-harmonix “Tube Zipper.
It features more subtle analog synth-like sound effects.
Very rare and hard to find on the market!
There are scratches, stains, and other signs of use commensurate with its age.
Electrical modifications, DC jack replacement, 4 screws replaced, all electrical contacts adjusted and cleaned, no operational issues.
Item rank: B+: Some scratches, but no problems in normal use.
Case: No case
Instruction Manual: No
Accessories: No
specs
Item rank
B+: Some scratches, but no problem in normal use
12 months
Case
No case
User’s Manual
No manual
Accessories
None
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