Tube preamp recommendations for Pass X260.8 monos

Atma-Sphere MP-3. See below:

Mike

http://www.atma-sphere.com/en/mp-3.html

@soix i don’t mind a little bit of tube warmth, but I’d rather it lean more toward neutral than overdone. 

This one is being compared to Preamps 3-4 times it's price.....One reviewer said it "was the best pre he's ever heard...period ".  AUDIO gd Vacuum HE-1 XLR Fully balanced .with 10 Russian military grade tubes. It's made in China and it's a sweetheart...$4K...talk to Wally @ Underwood.

Even though they are both at the upper end of my uncomfortable price range, I’m really curious if anyone has a sense of the difference in sound character between the Audio Research Reference 6se and the Nagra Classic Preamp. To my understanding they both lean towards the more articulate, non tube-like, dare I say clinical side of tubed preamps, but as it’s not practical for me to do a side by side, I’d love to hear input on the differences between them, or even Audio Research vs NAGRA sound signatures generally.

i don’t mind a little bit of tube warmth, but I’d rather it lean more toward neutral than overdone.

If I were you and you’re running a truly fully-balanced system I’d go with ether ARC or Atmasphere, or VAC if you don’t mind a touch of warmth.  Best of luck.