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Don't measure the horizontal plate, ever. It's got a multi-kv pulse riding on it.
Ditto for the 1B3, which has AC on it.
The bottom, there's no easy/safe way to measure the filament voltage, but the HV out can be hit with a probe capable of reading up to 20,000 volts.
Without horizontal that's strong enough and close enough on-frequency, you don't get HV.
You need a scope to see if you've got the drive and frequency required.
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