[ARC5] AVC in SCR-274N receivers

[Ian Wilson]

Changed the Subject since I think this is an interesting topic
in its own right.

I would have thought that 100k is just too small to generate enough
grid bias (from grid current flow in the last IF stage) to provide a
noticeable amount of AVC.

Also, AVC could be picked off the audio detector stage.

I seem to recall reading somewhere that the receivers were designed
with AVC, but that this was not connected up in their final form.

This would be consistent with the original connection of the lower
end of the last IF grid resistor to the AVC network. The 100k/0.05uF
filter would remove most of the audio from the AVC voltage.

The complete story would be interesting. Apologies if this is readily
accessible elsewhere and I have overlooked it.

73, ian K3IMW