Kurt, I really don't know what the present manufacturers
recommend for the 572B, but I would think that 24 volts
would almost cut it off. I know the Cetron tubes at about
2400 volts ran a operating bias of about -2 volts. I think
if I were you I'd make the cutoff voltage at least 50 volts
and the operating bias adjustable from about -2 to maybe
-8 or -10 volts and that should certainly give you enough
leeway to be able to set it up at the proper point.
It seems to me that the usual ZSAC of a pair of 572B's at
2500 volts or so is about 80-100 ma.
Mark WB8JKR
On Wed, 23 Feb 2000 16:38:44 EST UNCRICHIE7@aol.com writes:
>
> Can anyone suggest what voltage should be used for bias on todays
> tubes. As
> in Chinese, Russian, USA 572-B tubes. I'm brewing a quad of 572's,
> mounted
> vertically, if that makes any difference. I'm using an older
> schematic and
> it suggests 2.0 volts. However I have read several posts suggesting
> anywhere
> from 2.0 to 24.0 volts. Which is correct and why? Ive built several
> 811 amps
> but this is my first 572-Beast. Is there a chart that anyone has
> designed
> with these voltages on them, just a suggestion. Well thats it from
> here, can
> anyone straighten me out. As always thanks in advance. Kurt, K3KL...
>
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