Re: Who has AGC... Fun Facts


Schematic of the Radiola 64


From: [] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Saturday, April 20, 2019 12:54 AM
Subject: Re: [BITX20] Who has AGC... Fun Facts


A curious tidbit about 1920's era radio:
They used to use a rheostat (a big honking pot) on the filament current to vary the gain.

A bit off topic, as I don't recall anybody closing the loop
by driving a servo motor to control that rheostat based on received signal strength. 

Jerry, KE7ER



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