From a quick look at your power supply diagram, it appears that some of the rectifiers will be "fighting" each other, especially in the bias circuit, vs the 230VDC B+ circuit. and the voltage doubler will be "floating" the lower end of the 120 + 120 VAC winding at 240VDC above ground. That will get directed through the lower right diode in the bias circuit, to ground, which means something is gonna get "toasted" in fairly short order.
I'll have to do some more detailed circuit analysis, but I see several
electrical "conflicts" here which will cause serious problems.
For convenience, I'll number the diodes in a left-to-right zig-zag descending order, so the uppermost left side diode will be D1 and the lower right hand diode in the bias circuit will be D10.
The four diodes in the 230VDC b+ circuit may have to be somewhat "heftier" than uF4007s, perhaps uF5408s (?) in order to survive any current spikes and peaks.
The 6S19P-V tubes should take very little grid bias current, in the order of microamps. The overall current drawn by the bias support circuitry is dependent on the resistor and pot values, and it should be only a few milliamps at most.
The "tap" cap (refer to the Ike diagrams) value can be determined by experimentation or a little application of Ohm's law.
Xc (in Ohms) = 1,000,000 /( (2X pi X F (in Hz) X C (in uF)).
Since we're dealing with 60 Hz AC, this can be reduced to
Xc = 1,000,000 / (377 X C (uf)
and further reduced to Xc = 2652.5 / C (uF))
Plan on some extra "leeway" for the bias voltage, maybe -125 VDC off the rectifier anode, then into resistors and pots, as needed.
Since you want about -85VDC for the grid bias, then plan on the ends of the bias pot being at -65 and -105 VDC, approcimately This allows for adjustment for mismatched and "aging" tubes. The scheme used in the "Ike" amp is perfectly good, the trimpots should be around 20-25K each, this keeps the current through each pot to about 1.6 to 2 mA, with a 40V drop, for a dissipation of approx 80 mW per pot.
Then it's a relatively simple matter of dropping 65V off the "ground" end and 20VDC off the "high" end of the trimpots.
I've never seen an SRPP phase splitter design before, theoretically it should work just fine.
HTH
/ed B in NH