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C457 is one of the caps I replaced, so it should be good. I tried subbing in a new one there anyway and got the same results, about 170V on the input and 160V on the output of Q801. Looks like the voltage regulator is at fault; I've got a couple ordered and will post my results when they arrive.
The cause of the complete shutdown after trying to adjust the focus was the result of blowing R417, a 1Ω fusistor. It's wired between the 125V output of the regulator and the flyback's primary, which would be consistent with the higher current draw caused by higher B+ voltage. I don't have any fusistors, but it should be safe to replace it with a 1Ω resistor in series with a fuse, correct? It doesn't give the current rating in Sams or the factory manual, but I'm assuming it's well below an amp.
I'm still a little confused why the HV only spikes when the horizontal deflection coil is connected, but hopefully that problem will disappear after I reign in the power supply issues.
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