- Class A tube amps have desirable sonic qualities, but other current tube or solid state amps can produce equally good sound quality without the drawbacks listed above.
That came from @atmasphere and while I agree with the majority of his posts, and learn a lot from him, the point above is too subjective. I've heard him comparing the latest Class D amps to tubes and using the 'equally good sound quality' comment. I've yet to have that experience. (But I also haven't heard Atmasphere's own Class D amps.)
There's a couple ways that good tubes present themselves that I haven't heard from solid state/Class D.