My 475 (which I had fixed thanks to this list, thank you!) has lostI had a HV mica cap go bad in my 475. Lucky for me it was easily
found using the ohmmeter. The bad cap measured 5000 ohms. So
you could try measuring the resistance of the caps in the HV
section - they all should read as open on the ohmmeter. As I
recall, I measured the resistance in circuit (obviously with
power _off_) and found it that way without the need to unsolder
each cap. However, I don't know if that is a "bulletproof"
So, before you give up, at least try measuring the caps with