Looking For A New Tube Integrated Amp With Very Specific Features

Honestly, the best tube integrated meeting and exceeding your criteria is the Audio Note Cobra. We have one in our system that beautifully runs our Quad ESL-57s. Best sounding that we have found for our very picky speakers.

The Cobra isnt class a nor does it have balanced inputs

I don't know why particular design criteria is important, such as single-ended, class A, or even balanced--it is the sound that counts.  The Cobra is okay to me, but I like the comparably priced and lower cost offerings of Synthesis Audio more (I heard direct comparison of the Cobra and the slightly cheaper Synthesis alternative that had a quite good built in DAC too.  If I were interested in Audio Note, it would be the Oto or Soro, but neither has remote control of volume.

@larryi certain design criteria are important to me because I find Class A sweeter than A/B & Balanced because it doesn't make sense to have a superior DAC & not make full use of it...
 However it looks like I'm going to have to compromise on the class of operation as Class A tube amps seem to be pretty much unavailable in a balanced configuration where as I have a few decent choices in Class A/B PP with all the other features I want so it is likely I will end up going that direction...

Balanced Audio Technologies makes fully balanced integrated tube amps.  I have not heard their latest offerings so I don't know how they sound.  I am not a big fan of the 6C33C-B tube, but one never knows how a particular amp will sound.