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----a 10pf caps need to be solder directly on R5 ,

----a NP capacitor 220uF 50vdc is raccomended on C1

----RB TRIMMER   is otionals , NO install !!

 bias setting :   for first setup install a trimmer 200k  instead R11 , start to a 20k value and turn the trimmer for your best value bias setting then replacemente with a fix value.

the Heatsink run very hot , for this amplifier need a very large heatsink ...four unit dissipation cabinet.