Focal 1038be or Revel Ultima Salon 2?

Serious?

Metal cones sound like a good fit with your Mc 275 tubes?

Incorrect in two ways: multi driver loudspeakers are typically more difficult to drive especially for a tube amplifier such as yours and secondly the warm un-fractured sound that your tubes can produce are more realized with nature fiber drivers or at least diaphragms that offer some damping which ultra rigid magnesium diaphragms do not! Get a pair of beautiful Tannoy speakers with warm beautiful bass and excellent coherent sound; now that would be a good match.

The salon2 would be great with pass labs for example IMHO

I own Salon2. Yes it can sound metallic, especially they have metal drivers. But you won't pair it up with bright and lean sounding amps. Salon2 can be very neutral sounding if set up right. Its sound is alive with lightning quick transient response. I still prefer solid state and hybrid (tube/transistor)amps. It is a big challenge with tube amps.

Hmmm I don't know what gear you are using them with but the salons are one of the least colored speakers made. Far less colored than any paper coned speaker out there. They can sound very full and rich with no listening fatigue at all

Agreed with Chrissain that Salon2 can sound full and rich depending on the amps being used.

When I auditioned the Salon2 at a dealer years ago, they used a CJ 140 monoblocks. The voice and instruments had very nice body and richness. However, the bass was not well controlled and the soundstage was very forward. I believe the CJ amps are very good; it just didn't match the Salon2. When they switched the amps to a Spectral amp, the sound really opened up but lacked body.

So choosing the right amp is critical. Don't be cheap on the amps

You guys are wrong about the metal drivers. These speakers do NOT sound metallic. Don't look at drivers and mentally project the sound you expect them to make. Just listen.

The Salon 2 are one of the finest speakers ever made, period. They have extremely little character of their own, and if there is a character it might be of slight euphony.....but very slight. This metallic sound talk is total baloney. It makes me question if you have heard them.

I nice stiff 100 watt solid state amp is the minimum to make them go, 200 watts would be better. Forget cheap tubes, but I have heard good results with 200 watt tube amps.