Yes, yes, and yes. Works for solid state as well. No mysteries. Not all tubes components are warm nor are all SS components neutral or cold.
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Ditto, ditto, and ditto.
I will add that cascading tube equipment which use different types of tubes can alter the sound in ways not limited to just warmth or the opposite.
I have a tube DAC with a pair of 6922s that feed a tube preamp with two 6SN7s. I've taken the tube preamp out of the mix and substituted a couple different passive preamps and it's quite interesting to note what the 6SN7s add.
My feeling is that the 6922s pass along a very dimensional and "closer to neutral" sound, while the 6SN7s flesh out the midrange and upper bass more which can give vocals and acoustic instruments that illusion of glow.