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Sometimes a re-builder would notice an aluminized screen and rebuild the tube with a straight gun rather than a bent one. They would usually put a note in the box stating that the ion trap magnet should not be installed on the rebuilt CRT. My guess is that you have a 21XP4-A (Aluminized) that has been rebuilt with a straight gun.
jr
Last edited by jr_tech; 01-10-2010 at 08:57 PM.
Reason: add info
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