Having owned Pass XA (fantastic) and most recently CAT/Atma-sphere/Music Reference RM9SE tube amps (fantastic) there is no doubt Tvad is right, the Pass gear is tube-like in the way he describes it, but it still doesn't recreate space the way tube amps do, I suspect it is impossible for SS gear to do it. That being said, the Pass gear is great SS gear that is a perfectly reasonable alternative to a tube amp that you can live with. SS does things tubes can't do quite as well too, it is all choices. But I've yet to hear an SS amp that really does tube sound, if I found it I would own SS. I also don't think a tube preamp will recreate that sense of space with an SS amp, it seems it is part of the way the amp interacts with the speaker.