Expert electronics opinions needed: Radiola 60

[Kamakiri]

Since a 5Y3 and an 80 are electrically the same, all I need to do is find an appropriate transformer. I do have an Admiral 19A11 parts chassis here, and the voltages on the Sams on pins 2 and 8 on the 5Y3 are 240 VDC....which brings me in the neighborhood. Plus it's not so ungainly huge that I can't sneak it somewhere.

Now, realizing that coming to this point has stretched my knowledge of power supplies about as far as it's ever been....would I just basically wire it in, disconnecting and using the wires from pins 2 and 8 from the 5Y3 to plate on the 80....then plug that in separately from the main AC in from the radio, hooked up to the variac, and increase the AC from the variac while watching the DC voltage until it levels off where it should be?