Atwater Kent Model 30 Question

[DavGoodlin]

I built a power supply for my AK from a vast supply of salvage parts.

It makes an A-voltage of 4.8 volts DC at 1.5 amps for the filaments
and B voltages of +95, 65, 22 volts for the plates of the 71A, 01A's and 12A respectively.

Question: Would I be able to apply the filament voltage as positively grounded and derive the C voltage from the A supply at -4.5 volts?

If not, I will add a second rectifier bridge to the A supply transformer.

Thanks - This is my first time doing this. Fortunately there are two AM stations that still play music here!