I’m 85% Sure You Will Not Know What This Is. Go Ahead And Prove Me Wrong (If You Can)
These basic radios used no battery, had no amplification and could operate only high-impedance headphones.
They would receive only very strong signals from a local station.
They were popular among the less wealthy due to their low build cost and zero run cost.
Crystal sets had minimal ability to separate stations, and where more than one high power station was present, inability to receive one without the other was a common problem.
