Tube Amps / Music Electronics
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|previous: Peter S After doing this for 30 years you w... -- 5/29/2000 5:14 PM||View Thread|
|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,|