sinotec pa system

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Hey i have a sinotec av-613 amplifier and it blew the outputs 3 times now seems like my ears dont have mercy on the poor thing though i have taken it in twice now and that just is not working can you pls advice me if it is posible to change the tipe of transistors to a beter alternative and if you know were to get a schematic/ circuit of the amp that would be gratly aprictiated thx alot in advance

here is the link for the npn transistors datasheethttp://www.toshiba.com/taec/components2/Datasheet_Sync//66/7886.pdf
 
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