dual power supply 24V CT 24V

A friend of me builds , Power Amplifier Circuit 30Watt sizes. But he lacks power supply Circuit , that be of good quality good and economize. I chooses this circuit , build easy , and give the electric current about 3A by have the pressure goes out about +24Volt and -24Volt .Which the important point of this circuit , be power transformer give Current low 3A. The capacitors must have 4700uF low sizes and durable Volt about 50V. Other detail , see in the circuit.