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In an electrostatic deflection tube, the ions get deflected along with the electron beam, so the damage gets spread out over the whole screen, gradually darkening the screen and destroying the phosphor.
Magnetic fields won't deflect the ions, so you end up with the classic "ion spot" in the center of the screen on EM tubes.
Last edited by N2IXK; 06-20-2015 at 05:48 PM.
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