ATC SCM 40 v 2 and tube amplifiers

I have, driven by Canary Audio 330s (monoblocks 25-30W / channel). The result was underwhelmingly syrupy, lacked dynamics and low-end and sounded limited in the high frequencies.
That said, the Canary amps are great products, and so are the 40SCM (I like these spkrs); together they just didn't gel...

The ATC SCM 40 needs power due their low sensitivity especially on high volume listening, I doubt that  32 watts tube amp can drive them properly.

The db rating doesn’t really tell the whole story of how an amplifier is going to do with a given set of speakers. You need to look at the impedance curve of the speakers throughout the entire frequency spectrum crossed referenced with the phase angle, they combine to produce what is coined as equivalent peak dissipation resistance. A large factor is how a certain amplifier deal with fluctuation in EPDR in real time, how much voltage and current it can sustain through it all, and with what level of distortion.


Below is a Stereophile article that’s a good read on this subject.

https://www.stereophile.com/reference/707heavy/index.html

I use my ATC SCM40 v 2s with a Primaluna Dialogue Premium with KT120 tubes (also swap in KT88 and EL84 sometimes). In triode I doubt any bust past 35 watts but it works great in my setup. I do have a mediumish  to smallish room and never listen much past 90 dB so mileage may vary. To me the Primaluna just makes the ATCs a little rounder vs my Hegel H160 used during most of the weekdays. 

Yeah, you CAN drive the SCM 40s with tubes, but why?  They clearly need solid state power.  Does ATC build tube amps?  No!  You're better off getting something like a Pass, Clayton, ot Plinius Class-A amp and pairing it with a tubed preamp if you want tubes in your system.  IMHO.