Westinghouse K840CK15 Restoration

[trinescope]

Originally Posted by etype2

RCA had 15GP22’s in pre-production as early as June, 1953 which they shared with other manufactures. The date codes on my 15GP22 indicate it was manufactured the 13th week of 1954. There was some indication that Westinghouse was manufacturing their own 15GP22’s. Any truth to this? Or were they just assembling the tubes on the line? I know that Westinghouse was working on a single gun color CRT about the same time, so they had the capability.

Not sure who made these tubes besides RCA. Mine is also 4 13 date code.

Here is the best I could do with a phone camera to get a picture of the phosphor dots; the holes I mentioned show up mostly on the blue and red here.