[billp]

OK, I've been doing some probing. I got a copy of the Riders schematic, 'cause all I had was the one from Philco, and as you've noted, the component designations are different. BrendaAnn, I found that I'd already replaced R17 and C20, and R3 checked out OK. I started to plan my attack on the 2nd IF can to see if R302 was open. It was going to be a bear to remove the cover, so I thought I'd just take a reading from the 2 wires (coming out of the can)going through that resistor (the white running to the volume control, and the green going to pin 4 of 1U5). I thought if the resistor (R302) was open, I wouldn't get much if any reading. Is my logic correct in this? In any event I got a reading of about 28K, which seemed reasonable (?).
All of the other resistors check out in spec.
So the AVC components seem to be OK. John I'm going to start investigating your other theory of a problem in the RF section.