Quote:
Originally Posted by Adam
I have a 7JP4 with a spot burned in the center, that is otherwise bright.
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Remember being a kid and watching the little white dot that would hang around for a few minutes after the 'family' set was turned off? This probably depends on your age. Anyhow, I think many years of that leaves a small burn in the center of the faceplate that is otherwise harmless to the tube.
I have seen many examples of ion burned tubes in old repair manuals. It seems like most were a larger circle, but of particular interest, now that I look back, is my memory of an example that was an X burned into the phosphor. I wonder how ions that supposedly can't hit the screen can do the damage I have seen, and read the heavily stressed warnings on....
I see the logic in the 'beam bender' theory, but I think there is a little more to it than that. I guess I should break out the books......