EL84 SE bias help.

[ronh]

Can someone please check my numbers and tell me if this is biased too hot for a single EL84 SE?

OT imp 5K
B+ @ plate 295V
B+ @ G2 268V
RK = 220 ohms
B+ @ RK 9V

I get plate diss @ 11Watts.
I am not looking to get max power out, just a safe operating point. Thanks for the help.

[Chuck H]

You are dissapating 11.6 watts actually. But that's only part of the picture because the screens are also dissapating some power in this formula. If you have a scope it's pretty easy to set the bias so the tube is operating at center between cutoff and saturation when at max clean output. This would be class A and probably closer to 13 or 14 dissapated watts using the above formula. So a smaller cathode resistor would be needed. But if the amp sounds fine at whatever volume you are playing it then it certainly won't hurt anything to run the bias a little cold, so it's fine. You aren't too hot for sure.

Chuck

[ronh]

Hot enough for me

Thanks for checking my numbers. I will leave it where it is. I can control the sound with my guitar's volume control and its loud enough for me.