This is kind of a funny question. I generally worry about whether I have any transistors in my gear.
To answer your question, it depends on the gear. My feeling is that the fewest items needed in the signal path, that can get the job done well, is better than more items. Adding unnecessary items, whether they be tubes, or anything else, is not conducive to good sound.
If you are wondering if you should put tubes in your system to cover up the digital flaws, then maybe you should look at the source, and fix the problem where it begins.
To answer your question, it depends on the gear. My feeling is that the fewest items needed in the signal path, that can get the job done well, is better than more items. Adding unnecessary items, whether they be tubes, or anything else, is not conducive to good sound.
If you are wondering if you should put tubes in your system to cover up the digital flaws, then maybe you should look at the source, and fix the problem where it begins.