02-12-2013, 05:09 PM
I was on radio and TV servicing course (B&W) and the tutor brought in the class a device which he though might catch on.It was in a plastic box, he passed it around so we could have a look at the device with 3 legs, he told us it cost 30 bob. Later he had it connected into a circuit in place of a valve, we couldn't believe what we heard, no heater and so small. Later still, he had a portable radio with several transistors, in such is progress.Ted
