assitance required with repair of harmon kardon ta600 reciver and amplifier

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ADear diyaudio members and administration I have a harmon kardon ta600 from 1976 and it will play for about five minutes and then it will turn to distortion or no sound will come out of the speaker ports at all and this is a very good amplifier/reciver that I would like to have functioning fully. It has played great up untill a year ago when I slowly started going. Please help. Any assitance is greatly appriciated.
 
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