Re: Pye VT4 - no EHT
You could disconnect the EY51 heater wires (set turned off of course) and then
a) check the continuity of the heater winding (it'll show as a dead short on any normal ohmmeter, it's just a few turns round the LOPT core, I think).
b) power the EY51 filament from a 6V PSU or battery (again, set turned off) to see if it glows and how bright/visible it is
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