To be blunt, Ray comes across much better than you do in your e-mail exchange, especially in your last e-mail when you call him evasive. At worst, he comes across as terse and appears not to want to spend the time to compare and contrast filter caps and internals. This is probably because you specify elsewhere the headphones you plan to use. If he compared and contrasted parts and design features between amps and you ended up buying an amp that sounds lousy with your HD600s, would you consider Ray's customer service to be excellent? I doubt it...
By the way, Craig Uthus and Jack Wu will not provide prospective customers with lengthy replies to questions such as yours either...they tend to be terse, mostly because they are busy, don't want to waste time on tire-kickers, and know that this forum provides a wealth of information about their products. The only person who ever seemed willing to chew the fat on the phone in my experience was Mikhail Rotenberg at Singlepower, usually in order to upsell prospective customers to more expensive amps and to hawk his NOS tube collection. And we all know how Singlepower turned out.
















