Heathkit GR 21 FM Radio

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I found one of these at the thrift store yesterday. Any ideas? It is tube, and has one aux input, and one max output. Here is a link to an ad I found on the net. http://www.somerset.net/arm/radio_pi...th_gr21_ad.jpg. You can expand the add to read it. The Radio works great. Nice cosmetics also. I posted in the Tube Forum, but did not get any responses. Probably because I did not ask.