You might be better googling for a 60v bench psu circuit, using op amps.
I have a vintage weir bench supply that has an output range switch, 0-30 at 2a and 0-60 at 1a, something like this might be cool with your tranny using the 2 outputs, assuming the lower voltage o/p is a higher current one which is hard to tell, the thivkness of the winding wire gives you an idea but its still only a guess.
Current limit is advisable, preferably adjustable a constant current source can be handy and so's a bench supply that wont dump 50a into your latest project when its wired wrong.