Tube Mono-Block Recommendation

Dragon vibe, what you've read has nothing to do with Atma-Sphere OTLs. These are perhaps the most bullet-proof and utterly reliable tube amps made. And, they are one of the few tube amps (only?) that match ALL of the characteristics you listed in your opening post. The only issue is whether your speakers are reasonably compatible.

I will research into it. Big Amps they look like Monster trucks. Over 20 tubes Each block :-) I wander how long those tubes will last. everything I have read about Atma has always been positive.

I hate making a decisions specially so when I cant hear all the gear in my own setup.

Speakers are Whisper XD so might need Ralphs expertise to check them out for me to see if they will match well.

Quicksilver V4 Mono Blocks. Great sounding, reliable,no nonsense amplifiers with plenty of tube choices to choose from.You can also save some money for other goodies.

Dragon_vibe, It is true that our amps run kind of hot. But that is not because they are OTLs, it has to do with their being class A, something that you indicated you wanted in your OP. If you want 200-some watts and class A, you are going to get some heat, but it will also sound better, all other variables being equal.

Reliability is why we are still here 37 years on.

+1 to Rushton's response. What is that Atma show trick? Pulling out an output tube when the amp is playing?

And yes Atma was the first amp that jumped to mind given your criteria.