Don't bias your tubes unless you think something is wrong, ie. if one or more tubes glow incredibly compared to the others or if one channel is fading out. Tubes should last years unless you listen a heck of a lot. You can always take your tubes to get tested (repair shop?).
Before replacing tubes, do some research. Some tubes make a difference in sound quality as well as how long they last. Many of the new tubes out there are very low noise and can keep up with classics like Mullard and Telefunken in sound quality.
Try www.tubesandmore.com or upscaleaudio.com If you can't find anywhere to test your tubes, either send them to one of these stores for testing or send them to me-It only takes a few minutes. All it will cost is shipping.
Before replacing tubes, do some research. Some tubes make a difference in sound quality as well as how long they last. Many of the new tubes out there are very low noise and can keep up with classics like Mullard and Telefunken in sound quality.
Try www.tubesandmore.com or upscaleaudio.com If you can't find anywhere to test your tubes, either send them to one of these stores for testing or send them to me-It only takes a few minutes. All it will cost is shipping.