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This is an interesting thread, I hadn't thought much about it.
Whether the gun needs a double magnet probably just depends on the gun design. Its also possible the if the tube is rebuilt it might not have the original gun design. Seems like there were many types of gun designs. The people that designed the guns must have understood how the ion traps worked, some of that info must have been lost.
Probably a lot of experimentation. 'Beam bender' does seem a more accurate term.
Whether the 'burn' on a crt is made by ions and just were they come from to do the damage is a good question.
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