You have a working one? I assume you have a step down to provide 120vAC for it? If so, power it up and measure the voltages coming out of the transformer. If you want, do this while running signal into a load for a reailistic draw off teh thing.
Now you will know the secondary voltages to specify.
As to currents, we can infer from the circuit and amp performance what those might be.
There is one that makes the +32v and +25. Judging from the circuit, the 25v branch carries less than 10ma. I doubt the -15v carries any more than that. And the 32v for the driver transistor? I'd doubt over half an amp.
And the main voltage supply? Calculate enough current to provide for full rated power into rated load, with margin for reliability.