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Get a VOM and check all the electrolytics in the AM section. I'll beat one is bad. Simply look for the VOM meter to swing one way ,then reverse leads it should swing the other.
Depending on the caps value it may swing more or less on differrent values.
I have used this simple method before and it works,even while the caps are in the circuit ,most times.
If there is a coil or low value resistor across the cap . . . it will not work.
Then pull the cap out and check it. It sounds to me like a bad cap in the the AM IF stages.
Al
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