I was probably editing while you posted -- I added one comment above mentioning that the flyback heating occurs whether the 3A3 is connected or not, so it seems to rule out something loading the HV as a cause. I had also tried pulling the anode cap off the 6BD4 earlier, and that didn't affect the low HV.
I'm encouraged to hear that CT-100 flybacks rarely burn up, so perhaps that means the likelihood of someone having a good one on a junker chassis is better than zero.
I most likely will need one of John's transformers, but I figure I don't really need it until I get the flyback situation sorted out.
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