Do tube pre-amps need bias adjustments?

I'm new to tubes. I'm thinking only tube power amps need bias adjustments, not pre-amps, but I'm not sure.

reedthis11-01-2007 2:52am

rushton Details Discussions Posts This discussion Message User 2,445 posts 11-01-2007 at 12:25pm Copy Comment URL Report Comment Edit Delete Reedthis, you're correct about tube preamps not having a bias adjustment. However, some tube preamps will benefit by having matched pairs for some of the tubes, just as will some tube amplifiers. This depends on the circuit design. As to amplifiers, most new tube amps today have incorporated an auto-biasing circuit to eliminate the need for the user to make the periodic adjustment. .
tiffany Details Discussions Posts This discussion Message User 8 posts 11-01-2007 at 06:15am Copy Comment URL Report Comment Edit Delete I own two tube pre-amps and you're right... no need for bias adjustments.
musicslug Details Discussions Posts This discussion Message User 430 posts 11-01-2007 at 06:55am Copy Comment URL Report Comment Edit Delete you are correct
ssglx Details Discussions Posts This discussion Message User 203 posts 11-01-2007 at 08:26am Copy Comment URL Report Comment Edit Delete I don't think they do. Did you get your AE-3 MkII?
reedthis OP Details Discussions Posts This discussion Message User 7 posts 11-01-2007 at 05:16pm Copy Comment URL Report Comment Edit Delete Ssglx, Yup, got it yesterday. Sounds terrific! Thanks, everyone, for the confirmations.