[R-390] AGC Problem - Diagnosis Help Appreciated

[quartz55]

I have just rebuilt all the filters on one of my IF modules and it measures 190+ megs from pin 6 to ground.  The one I haven't messed with and seems to work just as good measures about 170+ megs with a Fluke 189.  The one I rebuilt had AGC problems not unlike you describe, but I really didn't document the details, since some of the filters were dead anyhow.  They were all leaky when I finally pulled them out of the circuit.  It's not for the faint hearted.  If you think you may want to go there, let me know.  There are other things in that AGC circuit than the filters, you can seperate the filters out with some judicious pulling of resistors, like R507.

Dave
N3DT