i need help for uncle amp

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hi,

i want to make power amp for my uncle. i already made syms amp for my own, its sound really great to me. he likes my amp but he wants 150 or 200W Rms into 8 ohms with tight bass. any one have good circuit for it? power transistor must be use 2sc5200-2sa1943

Thank you for your help.
 
No - the symasym is optimised as it is, and you would have to substitute more powerful transistors in the VAS stage for the symasym to work on higher rails. By the time you are done adjusting it, you will have designed a new power amplifier.

I too would recommend the Leach amp circuit.
 
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