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HV tube shorts happen when there is a momentary external short of some type: flashover from the anode cap to aquadug, anode wire to chassis.., that draws an arc in the HV rectifier which pulls the material off the cathode. When I see a blown HV recitifer I always look for corona or leakage which can cause flashover.
Oh, I note the anode cap had fallen off prior to getting the set, it probably had already shorted to the chassic, starting the cathode damage.
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