I think we need to spend more time on the Atma-Sphere MA-2 Class A, 220 watt, OTL amplifier.
http://www.atma-sphere.com/Products/#MA-2
http://www.theaudiobeat.com/equipment/atma_sphere_ma2_mk31.htm
http://www.atma-sphere.com/Reviews/tas/workshop/index.html...