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AmpBuilder225 16th March 2009 03:28 PM

Bias Voltage
Hi, I suspect this is a trivial point, but I have the bias current required for each power valve in my amp of 36.5mA and I am not sure how to work out the bias voltage from this to enable me to pick potentiometers. Could anybody advise me here?

Poindexter 16th March 2009 05:27 PM

Just in order to keep this simple, what output tube are you using, and what voltage (plate to cathode) is it operating at?



AmpBuilder225 16th March 2009 05:42 PM

They're EL34's with 480V on the plate

Poindexter 17th March 2009 04:06 AM

Mullard & Co. say about -42Vdc.



AmpBuilder225 17th March 2009 12:27 PM

Thank You, That would make sense :)

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