I do not understand electronics. I took my non-working Boston Acoustics Receptor Radio AM/FM clock radio to the local Repair Shop. The Tech examined it and said the AM section is broken and that parts are not available. He also said any repairs would be expensive and probably not worth it. I appreciated his honesty and thank him very much.
I returned home and tried the radio one more time. The AM Section worked fine and I had sound again. I do not understand what happened but I am very happy that my radio now works.
I guess the radio just needed a re-boot. It was a good lesson. Next time, I will re-boot the device and see what happens.