I have just got tube amp, AA VSi75 integrated, with KT150 tubes. The tubes are very easy to bias on this model, select the tube number on the display screen and use the thin plastic screw driver through the access hole in front of each tube. Of course I am now planning for tube replacement albeit probably 18 months in the future. I cannot afford to get them from AA as a set of 4 are in the region of $1,500 CND so I will probably go for a matched set from The Tube Store that seems to have a good reputation. And of course we have Upscale which are more expensive than the Tube Store but offers more burn-in and testing which I'm not sure is worth it. Anyway really enjoying the change to tubes from SS.
Tube advice
I have several decent, newer ARC tube amps and will soon be approaching tube replacement time. ARC apparently has a very thorough vetting process for the tubes they install and sell. That of course runs a hefty premium, more than double what the same tubes would cost from Tube Depot etc. The money's not a total deal breaker but still, for all three amps re-tubing from ARC is going to run close to 3k and if it's all the same would definitely rather not have to spend the extra $1500. Any insights would be appreciated. Thanks