By the way... a follow-up on this one... Thanks to the huge group that replied! The bridge rectifier was shorted after all. I could have rewired it to use the other side of the rectifier, but decided since I had an identical part sitting here for free... I'd just replace it. I learned a bit about this particular supply having it opened up for the first time in over ten years of owning it, and appreciate all the troubleshooting info. I've filed away the replies with the schematic for the eventual "someday" when it dies again. Haven't done the "mods" yet... but I think she's going to get some output fuses... might as well protect the poor thing from my own stupidity in the future! Nate -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist