Better be very careful here, if a pop or flash near one of the three crts or picture tubes there is serious voltage there.
the tubes each have a sealed wire delivering at least ten thousand volts to each tube===I have heard this before. likely what you have now is the seal they place where the wire enters the tube (2nd Anode) is arcing.
tube has to be removed to get at and reseal that--not a beginner or doit yourself job.
Note: if you keep turning it on sooner or later it will destroy other parts.
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