Being that both Albert and myself are tube guys, you are going to get a "tube answer" from us.
I believe that "all tube" is the best way for sound quality in the majority of applications. You do not "ruin" any of the sound with tubes. A good tube amp or preamp will make the sound pass thru very clean. There is much less "grain" sound with a good tube amp. People with tube systems can hear if there is as few as one transistor in the signal path, because of the way it changes the sound. Once you start going into tubes, you will very quickly decide to eliminate all the transistors in the signal path.
Others will drastically disagree with me on this. I guess you just have to hear it to find out.
I believe that "all tube" is the best way for sound quality in the majority of applications. You do not "ruin" any of the sound with tubes. A good tube amp or preamp will make the sound pass thru very clean. There is much less "grain" sound with a good tube amp. People with tube systems can hear if there is as few as one transistor in the signal path, because of the way it changes the sound. Once you start going into tubes, you will very quickly decide to eliminate all the transistors in the signal path.
Others will drastically disagree with me on this. I guess you just have to hear it to find out.