I believe Jonathan Valin pointed out once how solid state amps seemed to push the entire presentation backwards, while tube projected forwards. I don't remember my old Goldmund Mimesis 9 pushing the soundstage backwards, but the Bel 1001 did, my NAD integrated did that and a few other amps. But not the Plinius SA-250 of 1994 vintage.
For me, if the music sounds "contained" in an invisible 'force field' of sorts, so that it does not move out towards you, it becomes less an "immersion" into the music, more "heard" (intellectual) than visceral ("felt"). But some of that comes from, as someone pointed out in a post, sitting to the rear of the hall. Carnegie Hall, from the balcony, now sounds more distant than it did in 2004. I thought it was my seat, but someone who lives in NYC confirmed that the sound was different to his ears, too, and that the sound does not "blossom" outwards (maybe the curtains they had around the stage helped the music move outward). So, I guess Carnegie Hall now sounds like solid state in 1st Tier, 2nd Tier and Balcony.
I prefer tubes for their tonal balance, but I've heard tube amps that are not particularly dense-sounding although they demonstrate the colors of the orchestra. My experiences is having a component with really good mid bass, it moves the reproduction closer to real life (although Avery Fisher Hall wouldn't demonstrate that. That hall has frequencies that stick out, others that seem 'shelved down'). And by really good, I meant the weight, authority and dynamics. Although cello straddles mid bass to squarely midrange, most of the playing I've heard (in the piano teacher's "salon" in her house where she gives recitals) seems to be upper bass/lower midrange frequencies (of course, these are related to the pieces she chose her students to play). Her room was very even sounding and the cello sounded luscious (and I was around 10' away from the cellists). About the only transistor amp I've had that sounded very tube-like was my Rowland Model 5, back in 1987.