I don't think the question in the original post makes any sense. The best imaging preamp I have ever heard far and away is the H-Cat which is ss. The second best is the tubed Exemplar Audio. H-Cat does not talk about phase but rather doppler shift. Exemplar talks about the noise level of the ac power supply. The Exemplar does not sound like any other tube preamp I have ever heard and indeed does not sound like tubes at all until you compare it with the H-Cat.
