Quote:
Originally Posted by Tom9589
One would think that they started with serial number 0001, but I find it hard to imagine that they made over 6,400 of these tubes. Maybe they did when you count all of the CRTs made for other manufacturers. After all, they did make 4,400 CT-100s. It's also possible that they assigned a serial number before the tube was tested. That would mean a lot of rejects used up a serial number.
I like Tom C's definition of "LB."
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My assumption, RCA likely assigned prefex’s to prototypes, and production 15GP22’s ? Trying to find out. Sometimes you see the chassis serial number incorrectly pasted to the CRT.
RCA did sell to other manufacturers, explaining the high number and some manufacturers built their own based on RCA specs. A mystery.