I have no expertise with tube preamps but I've heard this one many times and for long periods and it' the most realistic and convincing I've heard: the Messenger Pre Amp.
http://www.acousticimage.com/MessengerPreamp.shtml
It hasn't changed much over the years and others have come and gone and yes, it's expensive and certainly there are others out there that can keep up and better it in some ways but it does meet your criteria.
Good luck in your search try everything you can before committing.
All the best,
Nonoise
http://www.acousticimage.com/MessengerPreamp.shtml
It hasn't changed much over the years and others have come and gone and yes, it's expensive and certainly there are others out there that can keep up and better it in some ways but it does meet your criteria.
Good luck in your search try everything you can before committing.
All the best,
Nonoise