If you find a 22-0-22 transformer, so for +-30 something rails you could half wave rectify it to produce one +30ish. Whether this would 'help' I really don't know.
IOW two diodes, pointing at the top of the reservoir capacitor, other ends to each end of the transformer, centre tap to 0v. What Naim (used to?) do, but with two centre tapped windings, one per rail.
Additionally if the output devices can stand 15v each at the standing current, then a series pass transistor can too.
Although free AV amps PSUs may be unhappy about the continuous demand of the class A amp. The worst that can happen is failure.