Tube Mono-Block Recommendation

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.

Dragon_vibe, if your speakers require the Atma-Sphere MA-2 model amps as the right match, then yes. They are large, they have a lot of tubes, they are hot, and they burn a lot of electricity when not in stand-by. They are also GLORIOUS and will punch all of the sonic hot buttons you specified as your criteria.

My wife and I have used MA-2 amps to drive Avalon Acoustic Eidolon speakers for over a decade. We'd never consider another amp. In that decade of use, I've replaced 6 output tubes - *SIX* only. These output tubes run a long long time.

And, you will have one of the true gentlemen of High End Audio, Ralph Karsten, supporting you.

Marc Mickelson at The Audio Beat has consistently listed the MA-2 as his favorite amp:

Keeping the notion of "best" in mind, let's say that I don't have the luxury of picking five amps. I have to choose just one -- the amp that will be the conduit through which all of my music, digital and analog, passes. Which will it be? Solid-state or tubes? Push-pull or single ended?

Give me OTL in the form of the MA-2 Mk 3.1s and I'll live musically ever after.

See his full review at:
http://www.theaudiobeat.com/equipment/atma_sphere_ma2_mk31.htm

Good luck in your search.
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Dragon, how do you like the sound of Bob's tube mono block? Not sure if you read my prior post about simple mods to Bob's amp that will significantly improve the sound of the amp. You can drive 1 ohm loads with his amp.