100W Ultimate Fidelity Amplifier

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  • APEX AX12C.JPG
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hi
a build AX14 amplifire but i have a problem
i series two 100ohm 3 watt resistor with positive an negative input voltage rail(+-45) for biasing and protect circuit from high current drain.
but when bias pot is above about 150 ohm voltage on 100 ohm series resistor is 0.8 volt and 2sc5200 Vbe is .2 and is off
but when pot is under about 150 ohm voltage on series 100 ohm resistor is 6 volts and 2sc5200 Vbe is 0.6 and is off but 100 ohm resistor voltage increase rapidly to about 40 volts!and become very hot
how should i bias my circuit?
 
i bias my circuit and set the 0.33 resistor voltage on 15mv but this voltage isn't stable and begin to raise.and 2sc5200 and 2sa1943 become warm and warmer.
2sa1943 and 2sc5200's Vbe is about 0.6
2sa1943's Vce is about 52 volts
2sc5200's Vce is about 27 volts
there is about 12 volts DC in output!
 
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