Bias Curves

oliverwestby · 15th July 2010, 11:13 PM

I am designing a fixed bias, EL34 Push-Pull amp which will have an HT of 350VDC

for sake of argument, I'll pick 325VDC for the screen grids.

Can anyone tell me what the formula is to work out the Bias Voltage (Vg1) for different anode and screen grid voltages.

Similar to the first 3 graphs in this datasheet,

HTML Code:

http://www.drtube.com/datasheets/el34-philips1969.pdf

Thanks,

Oliver

Arnulf · 16th July 2010, 06:16 AM

There is no formula, the curves are obtained empirically. EL34 is extremely well docummented so you should have no problems finding multiple datasheet for it.

15th July 2010, 11:13 PM	#1
oliverwestby diyAudio Member Join Date: Apr 2006 Location: Oxfordshire	Bias Curves I am designing a fixed bias, EL34 Push-Pull amp which will have an HT of 350VDC for sake of argument, I'll pick 325VDC for the screen grids. Can anyone tell me what the formula is to work out the Bias Voltage (Vg1) for different anode and screen grid voltages. Similar to the first 3 graphs in this datasheet, HTML Code: http://www.drtube.com/datasheets/el34-philips1969.pdf Thanks, Oliver

16th July 2010, 06:16 AM	#2
Arnulf diyAudio Member Join Date: Feb 2009	There is no formula, the curves are obtained empirically. EL34 is extremely well docummented so you should have no problems finding multiple datasheet for it. __________________ mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."

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