ampage 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

previous: Sean Kilback hi guys,Just wonder... -- 7/14/2000 3:18 AM	View Thread

Re: biasing? oscillation?

7/14/2000 4:36 PM
dpcoyle	Re: biasing? oscillation? What value resistor are you using to bias it? I'm not happy with an idle that is more than the rated plate dissapation. People seem to run the el84 pretty hard, but IMHO 80% of full tilt is a safer idle dissapation. As you describe, it leaves little headroom, although your poor breakup could be due to other things. Why not throw another 50 ohms in series with the cathode resistor and see if its better? Dan

7/14/2000 4:36 PM

dpcoyle

Re: biasing? oscillation?

What value resistor are you using to bias it?
I'm not happy with an idle that is more than the rated plate dissapation. People seem to run the el84 pretty hard, but IMHO 80% of full tilt is a safer idle dissapation.
As you describe, it leaves little headroom, although your poor breakup could be due to other things.
Why not throw another 50 ohms in series with the cathode resistor and see if its better?
Dan

Replies:

Sean Kilback hi Dan,I'm using th... -- 7/14/2000 4:42 PM