Expensive Tube Amplifiers

You’re talking about crossover distortion, which is vastly overrated as a problem.  I have nothing against SE amps, and the Magma is certainly an interesting, if extravagant, design.  If you want a world class amp, you could also look at David Berning’s push-pull 845 amplifiers, which I can say from personal experience are astounding.  And speaking of "world-class," you could hardly do better than a competently restored pair of Heathkit W2 amps, a Williamson knock-off with Peerless output transformers.  A smoother, sweeter, more musically satisfying pair of 20 wpc amplifiers would be hard to come by.

Traditional SE amps exhibit much higher levels of harmonic distortion than do push pull (PP) amps. Also, output impedance tends to be higher which made me wonder about the claim the Magma can drive a 1.5 ohm speaker. Anyway, if you love it that’s all that counts.

@dogearedaudio 

This is truly the 1st time I've ever read Heathkit and world-class in the same sentence. 

I'm not unfamiliar with Heathkit as I have a couple of their products in my house, including an oscilloscope I restored myself.

@lewm  Indeed, they seemed to have pulled off some remarkable tricks, and if they have, kudos to NAT.  I have no doubt that it’s possible to achieve exceptional things with smart designers and a cost-no-object design.  The Berning 845 PP amp is a good example.

@devinplombier Oh, make no mistake, the Heathkit W2 was a notable amp.  Based on the Sarser-Sprinkle "Musician’s Amplifier’ which was the first American-style Williamson proposed in 1949, it featured a scaled-down version of the legendary Peerless S-265-Q output transformer.  Predictably, Heathkit took some shortcuts, but if you restore it to the original "Musician’s Amplifier" specs it’s a marvelous amp.  A midrange to die for and smooth high and low frequencies.  An effortless amp to listen to if you don’t mind the 20wpc limitations.  I've restored several pair of these.  In addition, I recently had the honor of building a replica of the original "Musician’s Amplifier" for the son of Melvin Sprinkle, using a Peerless S-265-Q I had in my stash.  He had never heard the amplifier.  It was quite an honor.