Best Balanced Tube Preamplifier


I want to know your opinion about the best balanced tube preamplifier with real tubey sound.
I need balanced inputs and outputs and I´m loocking for tubey sound, not tube preamp. with ss sound.
Some options could be:
Audio Research Ref. 3
Sonic Frontiers Line 3SE+
BAT BK51SE
Unfortunally I can´t compare them so I need your opinion about them or others.
Thanks.
elduende14
I'm sure there will be a number of worthy contendors in the forthcoming posts. Unfortunately they will only represent "my favorite(s)".

You and your system can only determine the "best".

Good luck and be prepared for some very nice recommendations.
I only know the SF Line3.

It is a fantastic machine....
I tried many different tubes,Sovtek, Electro Harminix, Jan Philips, RCA, Mullard but the real quality jump has been to replace the Digital Volume Control CS3310 with the new BB PGA2310......a new pre.
I have the 1996 version, I do not know about the last.

Again, judge with yr ears and musical preferences.
the pre is very important but it is a piece of the chain.....
I dont know about the best but I used both ARC ref 3 and Cary SPL05. I took the ref 3 in as a trade from a customer. It's a great preamp, as a matter of preference, i prefer the SPL05 simply due to a slightly warmer sounding. Ref 3 is dead-on neutral.