All electronic devices require power. We have a lot of power supply circuits for you to choose suitably. Also, the battery is one of the important sources. It needs a power supply, too. To charge them work well. And, We love renewable energy, clean, and long with solar.
Your amplifier may sound better than before. Just change the appropriate power supply circuit. Multiple levels of output voltage. For example 15V Dual regulator for pre amplifier. And 38V Dual for main amplifier etc.