12-12-2016, 10:27 AM
(12-12-2016, 10:06 AM)Terry Wrote: Explains why they weren't much used in hearing aids, though ...
My Grandpa had a valve based hearing aid in the fifties and sixties Terry, I don't recall the type numbers of the miniatures used in it but it was about the same size as a pocket radio (ie. just fitted a pocket) and used a crystal ear piece. He didn't like going over to the behind the ear type as he maintained that it then looked like he was wearing a hearing aid, and not listening to a new fangled transistor radio as he used to tell people!
Andy.
