Tlg, I'll back you up here against repulso...
However, biasing tubes is the equivalent to changing your oil in that nice car. Even if you can't do it, understanding that it needs done is important (you did ask).
Reading the owner's manual should help. Only poweramps need the bias set. Some amps are "self biasing" where you don't have to worry. Others have meters or LED lights to indicate proper bias. Older amps and some simple designs have nothing and need set with a meter and probably a technician. Again, read your manual. I'd also suggest some basic reading just so you understand some. On sonicfrontiers.com, go to anthem and find "a taste of tubes". Skim this.
What happens as the electronics break in and/or wear out along with tubes aging, the current to the tubes will need minor adjustments. Too much or too little can shorten the tube life and even affect sound quality. If your tubes always burn orange and one or more "flare" up or start burning bright blue (really hot), that's a huge indicator to shut if off and get it looked at.
Otherwise, every 1500 to 2000 hours of use you will need new output tubes and just get a quality tech to do the installation and check your bias.