I'm in Tgrisham's camp for the most practical solution for most people..
There is no right answer but I think tube pre and good SS amp can deliver all the goods in more applications more cost effectively and more reliably over time than can all tubes.
All tubes will cost more and have more limited application depending on speakers and will also probably require more maintenance over time than many might be comfortable with.
A few carefully placed tubes is a cheaper and easier way to go.
Not to say that some of the best sounding systems out there may well be all tube systems.
There is no right answer but I think tube pre and good SS amp can deliver all the goods in more applications more cost effectively and more reliably over time than can all tubes.
All tubes will cost more and have more limited application depending on speakers and will also probably require more maintenance over time than many might be comfortable with.
A few carefully placed tubes is a cheaper and easier way to go.
Not to say that some of the best sounding systems out there may well be all tube systems.