Some vacuum tubes are worth thousands today. Most are worthless.
FIL is in his 80’s. When he was a kid, he hung around with the old guys who were ‘tinkerers’ and built cool stuff. He never got a college degree, but he had practical knowledge and eventually became head of the Research and DEvelopment division of a major corporation. Has 11 patents under his belt.
One of my friends has a lot of vacuum tubes and he has one of the tubes KDKA used in the 1920’s.