Rogue DragoN or Bel Canto Ref600 M

This is not going to help much.

Both use the Hypex NC500 modules but the Rogue has linear power supply and tube input buffer.
Where the BelCanto use switch mode (smp) power supplies and an opamp input buffer.

I like the idea of having a linear power supply, of the Rogue, but not a capacitor coupled tube buffer to drive the NC500 low input impedance of 2kohm. https://hifiheaven.net/shop/image/cache/catalog/Rogue/rogueaudio-dragon-inside-750x750.png

I think the opamp buffer of the Belcanto would be better suited to drive that load https://ibb.co/jy63sq9

Cheers George

I've had the Bel Canto amps for a couple of years now. They do not disappoint in any way.  Musical, detail, sound stage.  I have been using them with two different tube preamps and the result is stunning.  They had the juice to power my Acoustats and the clarity to couple well with my Goldenear Triton Ones.  BTW, I'm using a BC DAC too.  Very nice.
If it matters, I listen to a lot of jazz and orchestral music, solo instruments, music from around the world, all kinds of rock, and plenty of pop from all eras.  It all sounds musical and pleasing.

Sorry wrong pic above for the Belcanto’s opamp input.
This is it circled
https://ibb.co/1sswLW5

Cheers George

Now that I look closely at the Rogue, it too probably has opamp buffers (circled) to drive the Hypex NC500 modules with.
https://ibb.co/S0ZySr7
With just maybe the tube as input for the buffer to give some tube flavour, good thing is that "could" be switchable bypassed by a good tech.
And would result similar to Belcanto then but with linear supply my preference.

Cheers George

Consider PS Audio M1200s, which have a tube input