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If I Recall Correctly (IIRC), you wouldn't even see a picture on the new CRT if it required an ion trap and you didn't have it on. The electron gun aims the electrons and ions downwards so they'd hit the inside of the CRT's neck. And as electrons are way less massive than ions, it's easy for a magnet to deflect the electrons and barely touch the ions. I don't know if they placed getter material at that spot of the neck's glass to trap the ions, to take them out of circulation.
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