[Mondial]

In this set, the AVC voltage is obtained from the diode detector through R11 and then filtered by C12. Its a bit unusual in that the voltage is not taken off the detector output to the volume control, but the DC voltage is the same at both points. They also use the other diode of the 7C6 directly across the AVC line, probably to develop contact potential negative voltage to set the no signal grid bias on the RF converter and IF tubes.

http://www.nostalgiaair.org/pagesbymodel...013597.pdf