Post by trombone on Oct 4, 2020 17:11:39 GMT 12
Hi everyone, I'm looking for a microphone "hummer"and would love to hear from anyone who would be prepared to part with one.Apparently they are (were) used to excite a carbon microphone in the 1930s but can also be used as an interrupter for low tension power supplies.There is an article on Radiomuseum explaining what they are.Cheers all, Trombone