This thread kind of opens Pandora's Box. Putting "tubes" and "musical" in one statement is like opening the gates to all possible subjective and semantic thunderstorms.
On a scientifically oriented forum one might expect that people try to make precise points and differentiate arguments into distinct cases. And to ask questions. And it happens, but those attempts seem to get swept away time and time again by those who mix everything together and insist on all kinds of possible interpretation of words and statements.
Good points on rhetorical constructions. Agree the tactic is to deflect and dismiss without actually having to address anything of substance. Getting out the dictionary to win the debate at all costs was particularly ridiculous.
You said it better than me.
For me it makes no sense to talk about a category like "tubes" (or "transformators" for that matter) without looking separately at those amps that have audible distortion ("effect boxes") and those that are considered "competent" with SNR and distortion below audibility. (These do exist, do they?) And the effect boxes again will fall into different classes, if one does not want to claim "all effect boxes sound the same".
For audio there is only noise, distortion or frequency response. Good gear by the most reasonable definition, whether solid state, or tube based, has flat frequency response, and inaudible noise and distortion. So if you genuinely hear a difference with your tubes it can only be one of those things diverging from the inaudible to audible.
That's it.
The same is true for the semantics of "musical". After finding out that it has a plethora of meanings, how can one continue to use the term without making clear (context) what aspect/meaning one is talking about? And of course the meanings of "musical" that are related to the creative qualities of content (human, zoologic or environmental) are not really helpful here.
Instead I want to look at two interpretations that were mentioned before
- serving the music --- (too vague, that could still mean all sorts of things about the sound, for me it would mean "low distortion")
- pleasing to the human ear --- (that is basically a sonic preference and as such a bit more concrete)
The latter is still vague, but at least gives some kind of direction.
What I do not get about the idea tube amps (of different kinds) modify sound in a unique way "pleasing to the ear". How can a sound modification be "pleasing to the ear" in any general sense? That is like a spice that makes everything better ("rounder", "holographic", "airy", "more depth" - all these words not very helpful). If that were the case, why is this not already applied to all recordings in the mixing process? At least to the "good" ones. Instead it is often claimed that the good recordings profit the most from this spice. But if it was actually already applied, does it get better with twice the dose? What is the "right" dose? Shouldn't it become worse sometimes too? Maybe some listeners (tube people) just want more of that spice than the average (solid state) person?
If that were the case one would expect extensive discussion about the right nature/amount of the spicing (as it will be individual to some degree). It would be much more difficult to find an individually appropriate tube amp, compared to people who only look for boring gear with no audible effects. And I assume this will be very dependent on the recordings one listens too. After all "better" for harpsichord does not necessarily mean "better" for flute too, and in popular music so much effects are used that I cannot imagine a "one size fits all" approach, but what do I know?
There is tube rolling and discussion about tube amps of course, but somehow for many (audiophiles) all kinds of tubes still seem to have the same or at least a very similar effect.
And then there are the "competent" tube amps, that will have no audible sound modification. Still many (not all!) insist on this "special something" and underpin that often with corresponding anecdotes. But how can you prefer something that is not there?
I wonder whether this "special something" would be still as popular, if it were worded more along "transformer sound" instead of "tube sound".