A friend takes an interest to want to try build hi-fi power Amplifier the some one. He likes model class AB , because the sound is good. keen bass good distinct.I chooses this circuit gives him sees , be power Amplifier hi-fi OCL 120W rms sizes really,if use power supply circuit at enough good and use 8ohm size prominent point interesting loudspeakers. Of the circuit be use the transistor entirely have no the integrated circuit mixes. Then make bland good sound , for power supply voltage should use +40V GND -40V sizes give current about 4A. Other detail please see in circuit picture better.