Amps Atma-Sphere M-60 Mono blocks OTL design

OK: you asked. A lot has to do with the speaker of course, but the feedback we have from customers is that if the two amps are on a speaker that is friendly to both that essentially it is as you surmise.

But we get that a lot and not just with comparison to the Primaluna. That such is so is not surprising on two fronts; the most obvious being that obviously the positive comments are coming from customers that set the amps up right. The other is the overall design features of the amp; M-60 has full power to 2 Hz and can play bass quite well, owing to only one stage of gain and a direct-coupled output. With so little to go wrong its obviously very fast and more transparent without brightness. Triode operation. Fully differential. And so on (no single feature, but the combination of all of them makes for what the amp is). manufacturer caveat: we make the M-60 amplifier.

Ozzy,
I believe a more compelling and "competitive"  comparison would be the Line Magnetic 805ia.  This is a very highly praised 805 tube SET with 45 watt output.  Of course with these types of comparisons, final choice has much to do with plain old taste. Both of these fine  amplifiers will have their passionate and loyal advocates. 
Charles 

I think an M-60 to the Linear Tube Audio ZOTL 40 comparison would be very interesting. David Bernings OTL design and Atma-spheres OTL. Two very fine amps with similar design concept.....or maybe not so similar? I know they are both OTL but after that they may not be similar at all. I've heard the ZOTL 40 and it took my breath away. Would love to hear the M-60, even if it it out of my price range, as I'm sure it would also. 

Hi Ozzy,
No I do not know of any direct comparison.  My point is that both would sound excellent yet appeal to different sets of ears. 

Mac,
The Berning design avoids the traditional output transformer but uses a very unique radio frequency form of an "-output transformer ".
Charles