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HV rects are not mercury arc tubes...They are normal filament type vacuum tube rectifiers, and can go bad.
Power tubes like horizontal, vertical, and audio output often DO get very hot by design...If the plate starts to glow a dull red/orange in a dark or (worse a) light room then the tube is being run well beyond it's plate current rating indicative of major circuit issues...Start by verifying grid bias voltage relative to schematic in those conditions, and avoid running a tube that is 'red plating' for more than needed to warm up and get a reading....You will shorten tube life, or ruin a tube by letting it red plate for more than 1 min on end.
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