Vertex Amp By apexaudio

Hi Apex audio. Can I change amp this to a 2 step version with 150v and 75v rails ? I have just got a 3.5kva transformer with 53v windings x 4. Can I just leave out the lower voltage stepper ? and do you think this will affect the efficiency much.

Thanks for all the work your have shared.
 
Can anyone share the schematic of this amp please....

Thanks...
 

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