Como dizer “Rádio galena” em inglês

Rádio de galena = Crystal radio receiver

Also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio.
1 - His father bought him a crystal radio receiver which he assembled, took apart, reassembled and rebuilt several times. (en.wikipedia.org)

Aparelho rudimentar de rádio em que se empregava o cristal de galena para detecção de sinais radiofônicos.