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There have been cases of resistors that are in the HV output going bad, so if there is one it may be a suspect. The check for HV DC is to unplug the set after operating it and discharge the CRT anode to chassis ground...if you get a spark then you know the DC portion is working.
Does this set use an HV filter capacitor (round cylinder with screw terminals on each end, and connected to HV line)...it could possibly be bad. If the tube uses a graphite coating make sure the outer shell of the tube is grounded to the chassis.
Also don't connect the meter to the horiz output plate lead with the lead connected to the tube, only meter the lead with it disconnected...there can be up to 5KV AC pulses at the plate of the H.O. tube when the flyback system is operating which can destroy the meter. With the plate lead disconnected, you are only measuring the DC from the B+ supply.
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