Silver Supporting Member
I just picked a Bias Rite from Weber and I've got a couple of questions about it. I read the plate voltage on an Alessandro Working Dog 6L6 version that I'm retubing and got 427 on one tube and 420 on the other. I split the difference and went with 424 and came up with a bias setting of about 49ma. George put a sticker in the chassis recommending the bias be set at 35ma. Wouldn't that be a hot bias if the 70% dissipation was 49ma? Or...maybe I did the math wrong? Where does the "30" come from when figuring out the bias for 2 6L6's using the formula "30 divided by X, where X= plate voltage"? From the tube type or the wattage of the amp?