EHX Zipper Mods
The EHX Zipper is an envelope follower pedal built specifically for guitar. Stompbox Electronics provides modification services for the classic big-box version of the EHX Zipper, including the:
- LED/True Bypass Mod
- Synergy Mod
- Sensitivity Mod
Baseline Mods
The Baseline Mod consists of two modifications: the LED/True Bypass Mod and the Synergy Mod.
LED/True Bypass Mod
The Electro-Harmonix Zipper does not come with an indicator light. When you’re performing there’s no time to second guess whether your gear is engaged! Additionally, the bypass arrangement is not true bypass. This modification converts the bypassing to full True Bypass and installs a 5mm indicator light held in a chrome bezel.
Synergy Mod
The Synergy Mod throws away the positive-tip jack and replaces it with a modern +9V negative-tip barrel jack found more commonly in today’s pedals. After this modification you will be able to energize your vintage EHX pedal with a typical BOSS PSA adapter or equivalent, effectively synergizing your Zipper with the rest of your pedalboard.
Sensitivity Mod
A little known fact about the Zipper: it has a sensitivity control located inside on the circuit board itself in the form of a “trim pot.” The Sensitivity Mod externalizes that functionality by installing a knob for sensitivity control, allowing you to more fully shape the attack of the envelope follower.
Common Accessories for EHX Zipper Modifications
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Isolated Power Supplies
There are plenty of power supply units that carry 9VDC as an option. My recommendation is the Voodoo Labs ISO 5 for small pedalboards, and an MXR ISO Brick for medium-sized pedalboards.
Power Cables
Got Questions? I Got Answers!
Hopefully I covered everything, but if you have any questions on the EHX Zipper mods above feel free to contact me using this contact form!
If the mods above aren’t what you’re looking for, you can always request a custom modification through the Custom Guitar Pedal Modification Request form.
