[Terry Judkins]

Yes, as I recall part of the adjustment procedure is to zero beat the detector oscillator with the 9.1 mHz If signal. Apparently your cap is kaput. I really do not remember what the cap looks like and don't relish taking one of my working sets transformer out to see. Maybe you can find a suitable replacement. I have some small 20-120 pf caps about the size of a pencil eraser that I got from Ebay. i suspect though that the suspect cap is more like 5-30 or so. You might find one at Mouser. As proof that the cap is bad you could parallel a small value silver mica cap or even a 'gimmik' (two insulated wires twisted together).