I first saw a dynamotor in 1973 when I was just out of short trousers. We had a radio club at my school and the teacher who ran it was into US WWII surplus. He had many dynamotors in basement rooms at the school. I often what happened to them after he retired and had to clean out his collection. Or when he died a few years back. I used to visit him when I went “home” to see my mother and his house was creaking under the amount of green radio gear.
They sell for stupid money now if you have a working one in nice condition. Still go for a good price if tatty.
This is how I remember them…
The teacher was a real character… he’d worked at Windscale Works as a lab tech back in the fifties and had actually seen Plutonium metal produced for the UK Nuclear weapons. Not that many people can claim that.