Blew mine up a while back: no DC output, line fuse blown. Since I have no workbench here, I took it to an electronics repair place, and sent him links to the Astron repair and schematics site. He found one of the output transistors shorted and replaced it, and then replaced the IC723 regulator, and pronounced it fixed. Sure enough, it has idle power back, but when I turned my TS-430 to transmit (into a dummy load) and slowly cranked up the carrier, the TS-430 went crazy. Looked like the current folded back on the Astron, too. I checked the TS-430 with my back-up Astron and it's fine: power cranks up smoothly to where it should be. So I need a variable DC dummy load for the Astron so that I can load it incrementally without risking my equipment. Would a string of 60 watt incandescents do the trick?