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Wow! That on the left is interesting. A lot of my vintage test equipment and NRI stuff came from a pile of stuff that a friend found on the curb after an old repairman died and his wife decided to sweep his memories to the dump. Anyway, out of all of the stuff that I did get, I DIDN'T get a bunch of maybe 4" round crts with a grid of some sort on the face. The socket and neck seemed to be the same size as any 40s-50s tube. I thought that they would just be more useless stuff taking up space, but now I wonder if some museum might be interested in them. They are still there as far as I know. The one in your picture looks like the neck is much smaller than the others.
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