Quote:
Originally posted by kc8adu
it could still be a gassy crt though.
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That was going to be my answer as well. I've heard of color sets whose CRTs went gassy from blooming which was allowed to continue far too long. One set's CRT drew so much current from this that it also caused an arc across the base of one of the color demodulator tubes, which cracked the glass. One other set's CRT arced so badly it cracked the glass around the second anode button, but somehow (don't ask me how)
the CRT retained its vacuum.
FYI: If you notice the picture blooming out of focus on a color set, turn the set off at once and track down the problem before operating it again. If you don't do this, the CRT will likely become gassy from an unusually heavy current overload.