tak1
If you're choosing components that deliberately distort the signal, then that's another story.
... we have a tube CD player and a tube pre-amp or even tube amplifier, how do we know how much of the source tubes are influencing the final signal? Would not the pre or power amps masked the sound of the source?No, not if the tube preamp and power amps are neutral. They'll simply pass the signal that is fed to them.
If you're choosing components that deliberately distort the signal, then that's another story.