Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Peter S After doing this for 30 years you w... -- 5/29/2000 5:14 PM View Thread

Re: Bias current for EL34s in YBA-1?

5/29/2000 7:44 PM
Sean Kilback
Re: Bias current for EL34s in YBA-1?
Thanks for the frank feedback about the transformer shunt method. Next time I have the chassis open I'm going to install 1ohm cathode resistors!  
For my amp, I've got 480VDC on the plates of the new Svetlana EL34s. If I use your formula, that means 25W/480V * 0.5 = 26mA.  
So, my measured current of ~35mA is too much.  
Time to install an adjustable bias pot.  
Thanks very much!  

Peter S Sean, At 480 volts you can... -- 5/29/2000 10:02 PM