16WP4A ion trap?

[N2IXK]

Looked up the original Philco (Lansdale Tube Company) datasheet, and they just call for an "ion trap" and makes reference to a "#108 Ion Trap".

The reference to the "dual field" trap came from an RCA datasheet for their 16WP4A. Perhaps they used a different gun design than Philco did?

Definitely works well with the trap that came with the set, but the "sweet spot" for the location puts it right up against the CRT base.

[John Marinello]

"Beam bender" is the better term over "ion trap". The angled gun aims both the electrons & ions away from the screen. The beam bender redirects the electrons to the center of the screen, and has little effect on the heavier ion. If you have a decent image, you have the correct magnet. Earlier tubes used "double field" magnets. As they were rebuilt, all or most went to single field magnets.