Here is a really nice five part series of PBS TV programs about the history of radio and about restoring old radios. I got a kick out of W6AM’s description of the “exam” that got him his first radio license — you will find that story at the end of the first episode (above).
Here are all five of the progams:
https://www.youtube.com/playlist?list=PLLTogcYJemH5Oc_W8Q4gsae4a0zHvi5L8&fbclid=IwAR1H1Eq1vqMb_-MntRvPId5f_UpU5h-KJVtz2Wj8ijbTmSusr1BmGvcAROk
And here is the background info (from the YouTube Channel):
The Radio Collector from the California Historical Radio Society

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