the nubers certainly refer to vacuum tubes which were, when I was a kid, quite ubiquitous; being used in all home radios and TV's. Circa 1950's
and of course nubers means numbers
It looks like a handyman's repair diagnosis for a tube-powered TV. The comments in the "newest" ink from 1969 indicate testing/replacing all of the tubes except two ("band still there" may indicate a horizontal electrical disruption in the picture) then replaced the last two with two used (but still testing "barely green") 6GU7s, which resulted in "band gone."I enjoy your blog; I used to be a carpenter and working in older homes had a similar fascination with the discarded/forgotten things I'd find in closets, attics, or even walls.
Looks like a diagram of an old radio set.
A color TV tube schematic. The guy's testing the tubes to see which one (or ones) is bum. I have memories of my mother (in the 60's) going down to Sprouse Reitz 5&10, which had a tube tester, to test the tubes when our TV wasn't working. If she could fix it and not need to call in an expensive repairman ...One of the tubes mentioned: "The 6GU7 is a medium-mu twin triode of the 9-pin miniature type intended for use in the matrixing circuits of color television receivers." [ref: http://www.shinjo.info/frank/sheets/135/6/6GU7.pdf ]
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