That's a pretty tall order. Also nearly impossible. You have to have a range of amplifier requirements to start.
How much power?
Mono or stereo?
Speaker impedance?
Higher power amps need more mower form the power supply. Some amps need only a single polarity voltage while some need both
positive and negative voltages. Some amplifiers are more efficient than others. More efficient amplifiers need less power than less efficient amps.
Define more specifically what you need and then maybe someone can offer some help.
Cheers,
Dave M