There are so many tube variables it might be interesting to see what ppl like in terms of tube performance and tone from a make and model perspective and even a circuit perspective...
Here are some ideas... tube or solid state rectification, fave power amp tube types ie; EL34, 6L6, EL84, 6V6 etc..., fave power amp tube manufacturer, is N.O.S really better?, fave preamp tube type ie 12AX7, 12AT7, 12AU7 and so forth, fave preamp tube manufacturer, fave tube circuit ie; class A, class B, class A/B, how often do you change tubes, do you bias after every change, do you do your own biasing and if so what do you use, do you experiment with different tube types in both power amp and preamp tubes, what are the pros of tube, what are the cons of tubes, is SS amplifcation better or worse, is digital better or worse, will digital ever replace the tube?
There are many many questions to raise and likely some very interesting results!
Khing