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It is not the picture tube but is a vertical deflection problem. Usually it is a capacitor C246 and this is the location number and is a .47mf And at the same token bad solder connections on the pins of the vertical deflection IC301. Soldering the pins of IC301 is likely to fix the set.
This TV is probably finished. The picture tubes don't normally last more than 8 or so years with normal use. The back cover is easy to remove on most projos (power OFF!!). The picture tubes can be cleaned with a damp cloth like a chamois. Don't handle the mirror. The silver is on the wiping side - you will destroy it! Stay out of the electronics! Safety hazard.
SOny has had big problem with BAD picture tubes so when tube begins to short in return it will burn flyback transfomer ,shorting out hori output.I know i thru away better then 50 sonys all with same problem. some of them where only a year old!
Toshibas are notorious for developing shorts in the inernal guns of the picture tube. In your case the green gun is shorted to G1. The noise you heard was an internal arc between the elements.
It is unfortunate however, the repair of this problem usually requires the picture tube to be replaced. Sometimes a savvy technician with sencore picture tube rejuvenator can remove the short. This however usually does not last. Scrivitron