The ECP Audio Black Diamond should be arriving at some point today, so I'll be posting impressions for it tomorrow morning most likely. Very excited about this amp. For those who need a refresher as to why it's special: it uses transformers instead of tubes or transistors.
There's another amp coming out that uses transformers in the same manner. It's called the 515SE, and it's being crafted by a group known as The Audio Guild which includes Q-Cables' Steve Eddy who posts here on head-fi. Here's some info from their Facebook detailing the concept and design process:
I'm super psyched about this amp. Not only is the concept of using transformers intriguing, but the level of craftsmanship and attention to detail is really impressive. It reminds me somewhat of Moth Audio in that sense.