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Not any acute damage, just the normal warning about not leaving a fixed pattern on for days at a time, which will burn a pattern into the phosphors. It is quite normal for NTSC sets to have the red gun have more intensity in the red bar than the white bar. This is part of the matrix design that (approximately) compensates for the yellow caste in the sulfide green phosphor. (Extra gain in the R-Y turns off the red more for greenish colors, but it also turns the red on more for red colors.)
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