Here is a little more nostalgia, if anyone is interested. When I was around 12 or so, I had a beach radio. No-one else had anything like it and it made me feel pretty special. It used miniturised valves especially designed for portable operation, probably derived from WWII walkie-talkies. The valves needed bulky dry cells for the filaments. There was also a 90-volt battery for the anodes.
In those days only low-capacity carbon-zinc batteries were available. The anode battery didn't have to supply much current and it lasted for a reasonable amount of time, but the filament cells went flat very quickly, so the radio wasn't actually much good at the beach. A couple of years later I had one of the first transistor radios, consisting of three transistors with earphones. It was kind of like an early Walkman, but it didn't have anything like the same cool factor as the first radio because it couldn't be shared (= shown off) with others. It is interesting how times change.
(These were AM only, of course. Broadcast FM didn't exist yet. I also built crystal sets. But I'm talking here about my first real radios.)