Rare Custom DIY ARP-Style Analog Synthesizer – One-of-a-Kind Estate Find

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via this eBay listing

"Offered here is a truly unique and intriguing analog synthesizer, discovered at an estate sale in Los Angeles belonging to a longtime record collector. This piece appears to be a custom-built or prototype-style instrument inspired by classic ARP designs—featuring elements reminiscent of both the ARP 2600 and later Odyssey models.

The layout, switching, and signal flow strongly reflect deep knowledge of vintage ARP circuitry, while the construction suggests a highly skilled builder with access to professional-grade metalwork and components. The unit is housed in what appears to be an ARP pedal synthesizer case, though the internal assembly is not permanently mounted—indicating this may have been a custom project or experimental build. It has one etched circuit board on a module and the rest are on perfboard with point to point wiring.

Notable features:

ARP 2600-style panel layout with Odyssey-style switching influences

Point-to-point wiring with included schematic diagram

Separate keyboard connected via cabling

Vintage analog components throughout

Powers on (unit lights up), though full functionality has not been tested

Whether this is a one-off custom build, a studio project, or an experimental instrument from a knowledgeable enthusiast, it represents a fascinating piece of analog synthesis history. With some restoration or calibration, it has the potential to become a highly expressive and unique instrument."