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Could a weak video output tube also be causing the picture issue?
I had a look at it last night with the lights out, and far as I can tell, all the tubes glow, however the tube labeled as being for video output was glowing the weakest.
That tube appears to be original, or at least a very old Sylvania tube. I wonder if that can be used to provide a rough figure of the set's hours.
Some of the other tubes, including the one above the flyback are RCA branded.
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