Why would anyone want class AB amp when class A always sounds better ?

Ralph - Let me know if you need a Beta tester, I can pay the freight both ways. My systems are visible in the virtual systems page. I appreciate your balance of the theory and practical application ( the hard work of design ) I also appreciate that you understand the ear / brain sensitivity to and preference for certain types / orders of distortion. A deep understanding of that can greatly inform the design objectives for any amplifier.
jim

People with blood type A are always better than ones with blood type AB. What???? A nonsensical statement but assured to arouse a response.

Class A runs very hot and very inefficient , big watts in pure class A is big bucks

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And when one's listening room is located in say Here in New Orleans, or Phoenix, or  South Florida, , the heat factor of a  class A amplifier is a  important consideration.
 The  Defy7 is like, I think Richard Gray says more like class B,  throws off  less that I had anticipated/with 12 tubes. 
, Richard also prefers Class A.
 But as you mention, Big Bucks. 
Did you say very inefficient?
Oh I see , requires plenty of power current = heat.
Glad the Defy is not class A. the heat  radiation would be too much to deal with in my 10x12 listening room. 

Im not sure what I'm missing, as in, who cares how efficient an amp is.  Are any of us concerned with how much power we consume while listening to music.?? We spend zillions to achieve the best sound on components speaker etc,  power is pennies compared to what i spent on speakers.  Same with heat . So What.   Ive got 4 tons of ac so bust out the marshmellows.  ive never understood why people bring those up when what we are going for is sound.