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I would like to know if you retested the old tube after removing it? and if its shorted, can your tester remove the shorts? is there any physical damage to the old tube?
If you can clear the short, reinstall the tube, make a new you tube video of the back when you power it up, and see whats sparking. Is it on the socket board? those things had ground wires too, is it on? is the B+ around 125 - 155? does this tv have a trippler? I don't think so, but had to ask. You know its possible you have a bad yoke now... Not really likely, but you need to look at what the sparks could have jumped to. I think its pretty strange you have a bad tube now from that unpowered discharge on an 80's sanyo.
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Yes you can call me "Squirrel boy"
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