Maplin mosfet problems

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Hi all i have just built one of these using a genuine board and all the correct discrete transistors all available from rs, but i have a problem the amp works fine but the driver tr's get very hot in fact too hot to touch after about an hour of normal use the supply voltage = 50 0 50, quiescent current is set to 100ma and there is virtually no dc at the output. Any help appreciated B\c
 
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