Dear @o_holter : "
I am willing to sacrifice a few db in the noise floor to get superior tube performance. "
with all respect that is a plain misunderstood. Exist no superior tube performance but additioal distortions, that's what you have it does not matters tht that's what you like because that's not the main subject.
It's not only about higher noise, look: the input cartridge signal travel inside your unit or a SS unit. In your unit exist at least 5-6 circuit stages where the signal must pass and at each circuit stage that signal is degraded ( we can't do nothing about, no one can stop the signal degradation. ) in a well designed SS Phonolinepreamp ou can do the same in no more than 3 stages ( all depend in the designer abilities. ), so te signal degradation is a lot lower and that's why I said that what you like is only those additional distortions ( not only higher noise levels. ).
Tubes are not for an active high gain phono stage ( as a fact is not for today demanding audio. ), no one can defend what has no defense. Forgeret what the " experts " said and say, I live for years with tubes till I fall in count that all what those " tube experts " try to sale or to educate was totally untrue.
What road takes a phono stage designer, in reality two roads: hybrid designs or SUT as a pasive gain. In the first alternative the rough/hardest phono stage cartridge signal path is made it by the first SS stage in that hybrid design: with out this gain stage there is no phono stage at all and the same is true in those designs that use SUTs as the high gain stage. Is that high gain stage what puts the unit signature that tubes degraded in higher levels than same SS circuits.
For years the " tube experts/reviewers " try to sale us their arcaic " ideas " with out take not that the audio world already change it for the better and not because tubes but even with tubes there are great and better SS alternatives. As a music lovers and audiophiles we have to grow up and enjoy our today times that are bettter than ever before. Tubes is not the answer is the today wrong answer.
No one has to feeel " bad " for those facts because that's the reality.
There are several examples around and subwoofers is a good one. You have to ask your self: why does not exist powered subwoofers using an external tube amps?, because it can't handle with the rigthness and aplomb only SS can and that's all and this means: tight low bass, with full feeled power and no overhang, taut bass, precise and well defined note by note, efortless feeling, uncolored sound, etc.
Anyway, I'm not against tubes ( as I said I live with and heard in my system several touted tube designs as the Audio Note Kondo and the like. ), things are that I learned.
I'm not trying to diminish any tube audiophile system, no this is not my attitude.
Regards and enjoy the music,
R.