On Mon, 17 Sep 2007 15:19:26 EDT, "Richard Crowley"
wrote:

It is being picked up directly by two Royer ribbon
microphones which contain an active impedance-
matching circuit implemented with a tube ("valve").
No IF involved there.

Can you spell "audio rectification" ?? ggg
--

73 de K2ASP - Phil Kane

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon

e-mail: k2asp [at] arrl [dot] net