Most transparent power amp

I drove many speakers over many years with an SA4. I loved it. A few years ago, I moved into a smaller home and listening room, which forced me to consolidate my amp, pre, phono pre and dac into a single integrated. I was devastated by the prospect, certain my audiofool life was over. But, it wasn’t! The Devialet 220 integrated is both more transparent and dynamic in my home than the SA4 amp, SA5000 pre (both with premium gold Alta Vista upgrades), and PS Audio Perfect Wave dac it replaces. I’m driving currently a pair of Reference 3A MM de Capo BEs with a REL sub.  I never expected such fine performance from a digital amp.

Currently, I am loving the Job 225 and Job Pre2. Pound for pound a great amp. Best kept secret.

It's really interesting to me how many OTL's are listed here.  

Output transformers are often the limiting element in a tube amp, and the art of building them a dying one. The really good ones are expensive, hand-wound ones. Roger Modjeski may include transformer building in his course on amplifier design.