Quote:
Originally Posted by Herald1360
There doesn't seem to be any AGC on the set so VR1 will be acting as a manual RF gain control- more resistance will bias back the variable mu 58s and reduce their gain. AGC would do similar by applying negative dc volts derived from the rectified carrier to the grids of the 58s. It's an odd circuit for a late thirties set!
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AGC is taken from the detector output in the original schematic and in the OP's schematic, 1meg>0.05uF>>IF>>200k>0.05uF>>RF.
Lawrence.