Bias supply for a Univox/Hiwatt frankenstein?

[turbofeedus]

Hey all, I picked up this univox U-1001 on trade. Imgur album
4x 6L6GC output section, fixed bias using a reduced voltage tap of the HT winding.

u1000.gif

I wasn't happy with the construction, so I've gutted it and am planning to use a DR103 preamp instead.
Here's what I've got so far:

layout v2.pdf

For the bias supply, I was consulting http://www.valvewizard.co.uk/bias.html, and it shows a diagram for using the bias tap I have available, but I'd like to have independent control of the bias for either side of the PP output.
My assumption is that I'd be just branching off from the 10uF reservoir cap with a second, identical pot/resistor circuit. Is that accurate?
Is there a better bias supply yall would recommend?
The valve wizard article also talks about using a full wave rectifier, which can have less ripple, and cause less stress to the PT. Is this worthwhile or even possible with the HT winding tap bias I have?
Also, the univox schematic must be marked incorrectly, in that it seems to show 50V on the HT center tap? They probably meant that for the line below, the bias tap right?

[martin manning]

... I'd like to have independent control of the bias for either side of the PP output.
My assumption is that I'd be just branching off from the 10uF reservoir cap with a second, identical pot/resistor circuit. Is that accurate? Is there a better bias supply yall would recommend?

Yes, and no, that’s pretty much the standard.

The valve wizard article also talks about using a full wave rectifier, which can have less ripple, and cause less stress to the PT. Is this worthwhile or even possible with the HT winding tap bias I have?
Also, the univox schematic must be marked incorrectly, in that it seems to show 50V on the HT center tap? They probably meant that for the line below, the bias tap right?

You could do a FW, but I would go with half-wave as shown in the Wiz’s article. It will draw current on the opposite cycle from the HT on that side of the secondary. Yes the 50V should be referring to the bias tap. You can measure it to confirm.

[turbofeedus]

... I'd like to have independent control of the bias for either side of the PP output.
My assumption is that I'd be just branching off from the 10uF reservoir cap with a second, identical pot/resistor circuit. Is that accurate? Is there a better bias supply yall would recommend?

Yes, and no, that’s pretty much the standard.

Gotcha, figured it was straightforward.

The valve wizard article also talks about using a full wave rectifier, which can have less ripple, and cause less stress to the PT. Is this worthwhile or even possible with the HT winding tap bias I have?
Also, the univox schematic must be marked incorrectly, in that it seems to show 50V on the HT center tap? They probably meant that for the line below, the bias tap right?

You could do a FW, but I would go with half-wave as shown in the Wiz’s article. It will draw current on the opposite cycle from the HT on that side of the secondary. Yes the 50V should be referring to the bias tap. You can measure it to confirm.

Thanks Martin, will do.