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I had a Zenith 23" b/w set where the filament was open on the crt. Hooked the crt filament leads up to a horiz output tube and the tube lit up, so CRT was definitely bad. There were some other cases of no CRT filament I have seen but it was due to the crt being slightly cracked in a non-obvious area and losing its vacuum.
Also had a 6MJ6 horiz output tube burn out filament on a very well used CTC-39.
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