Tube Biasing: do I have to?

Just got new tubes. What should I expect if I do not have them biased? Thank you

jjwa05-19-2005 7:43pm

fatparrot Details Discussions Posts This discussion Message User 1,314 posts 05-19-2005 at 08:54pm Copy Comment URL Report Comment Edit Delete Does your amp have auto biasing? I assume you meant that you did not have them MATCHED when you bought them.
jeffreybehr Details Discussions Posts This discussion Message User 805 posts 05-19-2005 at 09:01pm Copy Comment URL Report Comment Edit Delete They're already receiving some bias Voltage, just not the the correct amount (probably). If they're overbiased, they'll wear out more quickly and maybe even glow red and blow. If they're underbiased they won't sound as good as they should. Why wouldn't you adjust the bias? .
uppermidfi Details Discussions Posts This discussion Message User 277 posts 05-19-2005 at 09:51pm Copy Comment URL Report Comment Edit Delete I'm glad Jjwa asked because I am in the same quandry. I just bought a used tube integrated amp. The second day I had it I blew the fuse. I took the unit in to find out why it blew, and the techie said that the four 6550 tubes were not in the same place the previous owner had them and therefore some of the tubes ran too hot and blew the fuse. I want to buy a new set of Svetlana KT 88s and will need to bias the new tubes, but my half-a-manual doesn't tell me how to do this... What are my options???