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I always think back to a CTC-31 I worked on that had an intermittent with the video output tube (at least I think that's what it was). When it "snapped out" the raster would go away and the neck of the crt would glow a brilliant pinkish purple. I'm guessing it was losing an important voltage (wish I was smarter in that respect) causing those electrons to go in the wrong direction, or some such. So, there are possible reasons for it to still be okay, but I would prepare for the worst.
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Bryan
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