I'm gonna swing over the Shack tomorrow and cobble together some equivalent capacitors to replace those in the HV circuit. There's a 220uF 16V-rated cap, and a 1uF 250V-rated cap, both electrolytic. I suspect the high voltage cap would have been the one most exposed to the overload from the Nixie tube short. Capacitance adds in parallel, right? I should be able to kludge together something with what they have in stock that'll be good enough for another test, at least. If that doesn't work, I think the next step is isolating the power supply circuits from the rest of the board entirely, so I can rinse and repeat what I've tried so far...
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