Tube Biasing? Explain Please

I'm new to tubes and would like to know what the terms "Biasing and rolling means in regards to tubes? thanks Darren

martice11-23-2000 2:52am

mattman Details Discussions Posts This discussion Message User 61 posts 11-23-2000 at 03:57am Copy Comment URL Report Comment Edit Delete Rolling means swapping or experimenting with different brands of tubes. Often times people take out the stock tubes and try different NOS tubes. Biasing allows you to adjust all the tubes so they all perform egually. Tubes may not age the same way. Biasing helps to fix that.
nex Details Discussions Posts This discussion Message User 13 posts 11-23-2000 at 12:29pm Copy Comment URL Report Comment Edit Delete How to do biasing?
mattman Details Discussions Posts This discussion Message User 61 posts 11-23-2000 at 04:05pm Copy Comment URL Report Comment Edit Delete It depends on your amp. The manual should have instructions on how to do it. My amp you have to take a reading on each individual tube with a multimeter then adjust the pots with a plastic screwdriver until they all read the same.
martice OP Details Discussions Posts This discussion Message User 103 posts 11-23-2000 at 08:52pm Copy Comment URL Report Comment Edit Delete What if your're using just a tubed pre amp? Is biasing necessary?
mattman Details Discussions Posts This discussion Message User 61 posts 11-24-2000 at 04:09am Copy Comment URL Report Comment Edit Delete I don't think so. You might have to buy matched pairs of tubes though.