Even though it gives me pause (yuck), I agree with your shorthand, but "tube sound" is so broad that it is dangerous. As you know, some tube amps are very colored and euphonic, particularly at the less expensive end of the "quality" scale. Many, IMHO, are designed with the attitude of "let give them what they want" rather than with a view toward accuracy.
Unfortunately, when many hear "tube-like" I'm afraid that euphonia the image counjured up. People with that image in there heads (I venture to say that's roughly half our readers here) will likely be sorely disappointed in the Capri. The Capri will NOT smooth out the hardness of their cheap CDP or DAC and they'll report something like, "the Capri is hard edged sounding in my system, but my XYZ amp is 'musical'". (Neither will the "best" tube preamps, which is what I think you're referring to).
Dave