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[AMPS] 572-B Bias voltage, for todays tubes???

To: <amps@contesting.com>
Subject: [AMPS] 572-B Bias voltage, for todays tubes???
From: 2@vc.net (measures)
Date: Wed, 23 Feb 2000 18:20:25 -0700
>
>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...
>
The correct bias is whatever it takes to produce the right Zero Signal 
Anode Current.   A pretty good semi-adjustable bias regulator is a string 
of forward biased 1A diodes.  Adjust the ZSAC  by shorting diodes.  
>--
cheers

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