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This happened to me on a CTC-31 about 15 yrs ago. Left the room and came back and there was no picture (sound was still playing!) and room was full of smoke. The flyback and HV tube socket were totally charred and melted.
I have been putting a 1/2 amp fuse in the cathode of the HO tube on these kind of sets as I think that would open the circuit through the HO tube. I know the old B/W sets often had a fuse in the damper plate B+ input, maybe I should put a fuse here too (or instead).
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