Contrary to hints above, I do not know what voltages Nelson used .....
however, I can tell you what I used ..... and what I get under load
Remember I found my toroids surplus, so "took what I could", I did not choose according to theory!
They are 35-0-35VAC, the cap bank is 4x 80,000uF in a Pi filter arrangement (there is a 1.5V drop across the chokes, which are large, gapped iron core types wound with braided wire .... don't know the exact value as they were attached to the heat-sinks when I bought them).
And the amp sees .... 44.5VDC
This doesn't bother me, as I don't need the 100W anyway and the amp is not worried by minor variations in rail voltage. I could remove the chokes and get another volt or so, but I'd rather keep the filter.
I do seem to recall Nelson using the x1.2 "rule-of-thumb" in some piece of correspondence, just don't ask me to remember where !
cheers
mark
PS: BTW ..... All thanks go to Nelson