hello i have a sony str-se501 home theater system it appears every thing works ecept the am fm tuner all i get is a buzz crackal noise  very faint station if at all and the dial keeps rolling to find a station when i search through the stations i have tried many different atannas i live in st louis area and my other raidios pick up just fine i opened the case and removed the pice the atenna ataches to  it is a small square looking aluminum box is this the tuner ??????  if so i am looking for the part to fix it 
                           
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