Philco 50T-1401 Ion Trap & Low Contrast

[bandersen]

You wouldn't get ion burn from an incorrect trap magnet. The electrons and ions shoot out the side of the neck. The magnet bends the electrons back towards the screen.

If the entire viewing area is discolored, it's probably just from years of heavy use. If you have a circle burned in the middle, it's probably been rebuilt with a straight instead of bent gun.