David C. Hallam wrote:
I
believe it might be more expeditious to find another 8443A I can purchase,
only after verification that it is working properly, than to attempt the
repair of mine.
David if you do look for another one, try to find a later one with LED displays rather than nixie tubes, they are a little bit more reliable.
But they are pretty easy to work on, all in all, given a modicum of test gear. I'd bet it is probably something very minor wrong with yours. And it's probably ten years since I had the lid off mine, but I don't remember anything odd about the coax connectors inside, SMC I think.
Good luck,
Dan