Probably a bit of a production from the UK, but when it is tube replacement time on my ARC amp, I ship it to them. They will give the whole thing a once over, test the tubes, and replace as necessary. They are great to work with and don't keep it too long. And they set the bias. I realize it isn't a difficult thing to do at home, but I don't want to poke around 480V circuits unless absolutely necessary.
Of course this means no fancy after-market tubes but just what ARC installs.