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I still have my tube at home. I think Steve got his at an auction about a year ago.
Mine is long gone to air, but is fascinating to look at. You can actually see inside the glass front and look around the side of the phosphor plate and see the mountings and down in to the bell. I believe there were two versions of this tube and then RCA came up with the experimental version of the 15GP22 that is found in some 15" production sets.
This tube has a series of eccentric bolts around the phosphor plate to move it into alignment with the shadow mask. The grid cups are clearly hand-welded by small elves. Lot's of info in the RCA red book submission to the FCC on color tv.
Dave A
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