I also understand that SoundLabs was using JC-1s in it's sound room. Transformers have all kinds of problems associated with their use. I am not educated enough to fully understand the issues but you can google this and like me you will probably be dizzy after the first page. The one I understand for sure is saturation. When the transformer saturates you hit a brick wall. It is pretty much like an amplifier clipping. But in the end it is the sound you like that matters. In my system tube amps can sound lovely but they have all lacked the dynamic punch necessary to recreate some music. This is only on ESLs mind.
bdp24, you know darn well that Jim Strickland was the first designer to put that stunt. I happen to know somebody who uses Jim's high voltage amps on his own ESLs:) I would love to see how Roger tackles this design.