I guess that he needs Vs=24V according to the schematic... I dont have any power supply schematic at the moment that is suitable for this... By tomorow I can find it, I think...
The power supply for a power amplifier does not have to be to sophisticated . The correct secondry voltage and current from the transformer a resonably sized bridge rectifier ( possibly 2) and plenty of smoothing say 10,000uf for each 100watts of power