el. scheme amplifier

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On my amplifier Empaser EA 1600D I burned about 18 power transistors , I had to fix it and I found that when I turn on the amp , so I still ringing in speakers. I put it back for repair and they found another 3 bad transistors , it is exchanged , but they still burn the same three transistors. and the repairman told me that he needs a theme.
thank you for your answer
 
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