You say it better than I, but I simply mean that the fact I read 12 at the HV point means it is the FET circuit or earlier with an issue, so that eliminates all the downstream stuff from troubleshooting for now. Thanks for the explanation of the FET amplification, I understood it involved oscillating a tuned circuit and passing the peaks onward, but only conceptually. Sounds like the FET is not turning on, then. I have four FETs left, I guess I can try, try again, and see if third time is the charm. Switching the diode didn't help, as I had kind of expected from the multi-meter tests. I'm just not sure what is left that can be replaced. Is it possible a board trace was damaged?
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