Desalvo55 and Jfrech,
Thanks for your comments.
I listened to the Ref 3 and was also considering the Tron Syren but decided that I wanted a remote (can't be spilling the Martini on the way over to adjust the volume). I also listened to many other preamps but they were at RMAF and they were in unfamiliar systems, often poor rooms and show conditions and not in my system so not a fair comparison. I live in a city with no high end shops so it is difficult to audition equipment in situ. I have also heard the CJ and VTL preamps at length in very good systems and liked them both. I have not heard the Aestheix. In the end, to my ears, the REX brings out the best in my system like nothing else I have heard and may be the single best component I own (along with the Raven). It is not a subtle step up from the 51SE but rather a leap and is much faster, more dynamic, better PRAT, more detailed, luscious sounding and well balanced than the 51SE. Also better transient response with the 6C45 tubes. If you like the 51SE, you will love the REX. Each chassis gets about as warm or maybe a little cooler as the 51SE but they are both on top shelves so get plenty of air and are not too warm to touch. There are 18 tubes, 16 active at any given time so there is some warmth. My system is: TW Acustic Raven Two with Graham Phantom with Air Tight PC-1 and Ortofon 309S with Ortofon Rondo Bronze, WSS Kable Platin phono IC's, Tron Seven phono preamp with two sets of inputs and NOS Telefunkens, Audience Adept Response 12 power conditioner, Audiopax Mono 88's Mark II amps with Ruby and EH tubes, Ayre C5XE universal player, Cardas Golden Reference IC's, speaker cables, PC's and jumpers, Oyaide outlets, Elrod Sig 2 and 3 PC's, Grand Prix Audio Monaco stands and Avantgarde Duo Omega speakers with Grand Prix Apex footers. I also have three Avantgarde Solos and a Shunyata conditioner that I will eventually integrate into the system.
You would be welcome to hear the REX in our system but we are a good distance from TX and I am an Aggie alum!
Good luck with your search.