ATC SCM12 and 50wpc Manley Stingray?

Misskuma, 40Watt push and pull tube amp is a little under powered. I've driven it with McIntosh MC240 and the speaker can kill the amp when you crank it up. I'm currently using a 55 Watt push and pull and it is the best I've ever heard out of the SCM10

I don't hear any distortion or clarity or imaging issue in my setup. If any more then it could be a bit analytical sounding. Maybe its your amp or speaker wire that wasn't able to provide enough clarity. I'm using NBS Master speaker cable and Stealth Ultimate Ribbon speaker cable. Either one is very good. I had transparent music wave super before and it is slightly distorted and less focused.

MC240 is 40Watt/ch. It is very well known for its power.
After replaced the filter capacitors then it got better.
These speakers won't blow because they're rated 350watt/ch.
When I tried to push it to the limit,
The sound start to break up, and msuic seems to slow down a little.. You get the picture.
My room is 14 X 11. The 40Watt will work but it still lack of deep dynamic when compared to the 55Watt Lafayette KT-550. YOu can do the comparison yourself in your environment.

I'm using Lafayette KT-550 55Watt/ch tube amp for my original SCM10 (80db)and it got plenty of power for my living room space( 22' X 14' X 8' ) It's never "lack of power" and the bass definitely could make the floor shake. I tried the Krells and they sound grainy compared to the tube amp and yet they don't produce more bass than the tube gear. For tube gears, it's not just about power rating, the output and power transformer has a lot to do with it. Therefore, if the stingray has adequate size of the transformers than it is most likely enough to drive it to a good room size.

Misskuma, in what way the midrange sound different betweent the SCM12 and the old SCM10? I have not audition SCM12. tks