Thought you might like a trip down memory lane…
in the presentation mention is made of tubes being tested
in such a manner to determine durability…some 5000 hours some 10,000 hours
some 50,000 hours…wow
Enjoy
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I’m old enough to remember RCA TV technicians coming to our house with a satchel full of tubes when our 21" black and white RCA TV “went on the blink” and needed repair.
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glad you enjoyed the trrip down memory lane…
My family’s black and white RCA was
huge, heavy, blew a lot of fuses (the screw in kind), and only caught on fire once! 
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When my mother wasn’t swearing at it because of repairs needed she was swearing by it as the best babysitter she could’ve asked for.
I remember watching test patterns on Saturday mornings until the cartoons started and the National Anthem was played.
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Oh, yes. Andy’s Gang, Sky King, Fury and all the rest.
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Don’t forget Howdee Doodee and Buffalo Bob. 
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Oh, never could forget them. Simpler times, for sure.
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Roy Rogers, Rin Tin Tin, Gene Autry and many more…
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Don’t forget Hopalong Cassidy!
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Different programs but similar memories. I used to particularly enjoy the transmitter information cards in the early afternoons.
Years later of course we all became teletext addicts…
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I remember when I was a child, my father had a problem with our TV. He took the vacuum tubes out and we went down at the local drug store where they had a tube testing machine like the one above. Then he would test each tube until he found the bad one. The machine was stocked full of replacement tubes.
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I remember my grandparents all tube television with a mechanical clicker remote. In a way, the craftsmanship and manufacturing expertise that went into mass production of large diagonal size tube displays themselves was remarkable.
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