02-09-2018, 02:29 AM
It could be a bad resistor in the oscillator tank circuit as well, I've had sets that would do that, the oscillator would quit working at one end of the AM broadcast band. However I believe that if the primary winding is reading high in DC resistance then corrosion has probably already set in and that winding will require replacement.
Regards
Arran
Regards
Arran