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I have a 7JP4 with obvious browning, even though the brightness is still pretty decent. The browning is darker near the center, but covers about half the screen or more.
It's correct that electrostatic deflection should deflect both electrons and ions equally, while magnetic deflection deflects the much lighter (and therefore much faster moving) electrons much more than ions. That being said, I'm not sure why the browning is more severe near the center of my 7JP4. Maybe there is a little more to the story.
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