Hi. The Heater voltage primarily comes from the LOPT, (Line Output Transformer). The pin on the transformer should be marked with a H. If there is voltage from that pin, follow the track from there checking for open circuit or out of value resistor(s). My personal view is that the LOPT is the cause of your trouble and should be replaced. It has developed an internal failure which has had the result of not supplying the heater voltage, even though it is generating HV. Hope this info is of some use to you and good luck.
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