Most transparent power amp

I highly recommend the Bryston cubed series, choose the size that fits your setup and you can't beat the warrenty.

Hi Lawence,
There are some really good companies listed. Here are a few more suggestions that you may want to check out.

Rogue Audio - Tube - great solid build, best value for the money $$
Ypsilon Electronics - Tube - fantastic design, it will cost you $$$
Tidal - Solid State - "The Rolls Royce of High End Audio" $$$$$

Add Van Alstine. 

Hands down ultimate to date is the Acoustat DD Servo OTL. It happens to be tube but could just as well be ss. Eliminating the interface is the point. That's the game changer.

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.