I came across this video while doing research for another project. It refreshed my old electronic repairman days. Those were the days when you actually repaired radios and TV's rather then chucking them out.
They would manufacture about 100 tubes or so which were the only ones used in every other electronic assemblage. Unlike today where it is not even possible to get a hold of schematics or even the ICs (Integrated circuits) numbering in the 1,000's.
Today's electronic manufacturers order a couple 1,000 batches of IC's, then discontinue their usage in their next model. So it's impossible to replace them. Great for the consumer, but wiped out the repair business entirely.
The following video describes how to test vacuum tubes. It also is just about where my knowledge of electronics left off many years ago :-)
Video Courtesy of 67 year old Bill.. the "old64goat"
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