I made this video which shows how to test the power supply of an ARP Synthesizer. It was intended for someone with an ARP 2600, but I’m demonstrating with the power supply of a Pro Soloist, and the method shown can be used to test the power supplies in all models of ARP synths. To do this test you just need a multimeter, the intended audience doesn’t need to be electronics wizards or even know how to use the multimeter. If your power supply tests bad, I can repair it or supply a modern, upgraded replacement.
