Newbie's First Questions RCA TS 721 Restoration

[Notimetolooz]

I was away doing other things and missed a lot of the conversation.

This is what a permanent magnet single ion trap looks like from the 1950s.
[ATTACH]

Some early CRTs needed double ion traps.

The design of the electron gun in the CRT determines what type and whether an ion trap is needed. In a nutshell the guns are designed to send the beam out in a way that it does not reach the screen. Either the beam hits the side of the CRT neck or some internal structure in the gun. That because the beam contains ions that are heavy and would damage the screen over time. The ion trap acts on the electrons and redirects them to hit the screen.