Straight Beam Guns, Ion Trap?

[jr_tech]

Originally Posted by RitchieMars

It's been suggested to me that using a pair of ion traps might work by positioning the first to bend the beam to scatter the ions, and the next to bend the beam back into place. I only have one and it's the standard one that came with my Zenith's original 17LP4.

Clever idea, but it will not work that way. You can bend the electron beam with a magnet, and perhaps bend it back with a second magnet to get the beam to travel straight down the gun structure again, but the ions (being much heaver than the electrons) will be mostly unaffected by the magnets and will just go straight down the gun anyway.
The good news is that more modern processing, better getters, cleaner gun parts has improved the vacuum in CRTs, so that the need for an ion trap is reduced, even though the tube is not aluminized,
jr