Tube integrated amps

I'm going to guess that the Dynaudio 1.3SE are at least 89db effecient, and if so Melody I2A3 got a great write up by Ebaan at 6moons, enough so that I'll eventually give that a try myself.

If you like a sound that is fast, transparent, w/ excellent PRAT, tone & timbre than the Audo Zone AMP 1 gaincard is excellent choice...- but only 1 input.

A lot of nice integrated's in that price range, good luck.

Thats a little different, if your room is small or medium
in size than either the Manly Stingray, or possibly Canary CA-608(?) would be worth looking into.

Or a Hybrid: (tube pre/mosfet amp) Unison research

And if you decide solid state: I've had the Ayre AX-7e, very refined & natural.

Have Fun.

I have owned the Ayre Ax-7e and for $2K used it is everything and more that you could want, a highly resolved and natural sound...great soundstage and depth. A really nice amp, but for me the lack of tubes also meant a lack of inner resolution, note decay,...those little aspects that make your sound seem real (IMHO)
That being said, if you really want tubes in the chain;..I'd look into the Bat (300x?); tube pre & solid state.
The Prima Luna gets good press & will easily sell, if it didn't suite your taste. The VTL may not have the gas, based on what I've read on them, but I've never heard it.