"WShoots1" wrote in message
...

Now that you mention it, I believe that technique was used in some
modern
device. Hmm... Possibly something in the UHF range...

Bill, K5BY

A tunnel diode? As I understand, that was supposed to be the "Next Big
Thing" around 1960. Didn't work out that way. But Heathkit did sell a
few "Tunnel Dipper" GDO type meters.

Frank Dresser