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I agree with Radioroslyn.  Might have an iffy RF coil.  Fortunate that they are not to hard to remove from the chassis and rewind.  Actually one of the easier coils to rebuild.  Check the ground clip on the chassis as well.  The one on my 20 was  loose.  I drilled out the rivet, sanded the contact points on the clip and chassis, and reinstalled using a stainless steel rivet.  Take care, Gary

I did replace the fanstock clip because the original was totally destroyed. I do not have the chassis connected to any ground because I live in a large apartment building. I am afraid to try and connect the chassis to the electrical ground.