Bias Voltage

AmpBuilder225 · 16th March 2009, 02:28 PM

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?
Thanks

Poindexter · 16th March 2009, 04:27 PM

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

Aloha,

Poinz
AudioTropic

AmpBuilder225 · 16th March 2009, 04:42 PM

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

Poindexter · 17th March 2009, 03:06 AM

Mullard & Co. say about -42Vdc.

Aloha,

Poinz
AudioTropic

AmpBuilder225 · 17th March 2009, 11:27 AM

Thank You, That would make sense

16th March 2009, 02:28 PM	#1
AmpBuilder225 diyAudio Member Join Date: Feb 2009	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? Thanks

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16th March 2009, 04:27 PM	#2
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Just in order to keep this simple, what output tube are you using, and what voltage (plate to cathode) is it operating at? Aloha, Poinz AudioTropic

16th March 2009, 04:42 PM	#3
AmpBuilder225 diyAudio Member Join Date: Feb 2009	They're EL34's with 480V on the plate

17th March 2009, 03:06 AM	#4
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Mullard & Co. say about -42Vdc. Aloha, Poinz AudioTropic

17th March 2009, 11:27 AM	#5
AmpBuilder225 diyAudio Member Join Date: Feb 2009	Thank You, That would make sense

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