Musical figelity B1 N-channel

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Hi
i got a MF B1 with 2pairs 2N3055 per channel design. Rail is about + - 50V . One pair has a difference in temperatur of 15 degress C ( 30 to 45 ), also a big diff in bias. I already changed the emitter resisitor without change. Are the 2N3055 different in values ? also would like get an schematic
thanks for help
 
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