Someone on here has a Dartzeel Chinese clone, stating it was the best amp he has owned, but is now selling it, as he wants tubes for his new efficient speakers. Personally, if it was that good, I do not know why he wouldn't keep it as a 2ndary, or a back up. I believe it is on USAM. The Chinese are known to copying, and I think much of their stuff is likely pretty good ( from my readings, not from 1st hand experience ). Enjoy ! MrD.