Rebuilding the 15gp22: A final report

[jr_tech]

Originally Posted by John Folsom

It was not until the RCA 21CYP22 that the faceplate and funnel of the color CRT were joined using frit glass seal. Pity this technology was not available for the 15GP22, or the 15HP22.

Yes! If only Corning had developed devitrifying frit earlier our CRTs would likely be in better shape today. The first use in the 21CYP22 would appear to be in 1958.
This brings up a question... the 22EP22 was produced by Westinghouse in 1956.. Unpublished pix courtesy of CRT historian Peter Keller show the CRT and panel/funnel seal area...there is no frit bead! Anybody know how the seal was made?

jr