Looking For A New Tube Integrated Amp With Very Specific Features

@freediver you haven't specified if you want a differential balanced amplifier or just balanced inputs and outputs.  

You could have said "long tailed pair".

@faustuss Yes, I could, but FWIW that term is considered outdated by a few decades, although I still see it used from time to time. Its often used to refer to a driver circuit in an amplifier, and as such while it does describe a differential amplifier, the kind that are used in amps that use that description usually are not high performance.

A good differential amplifier will have a constant current source (CCS) in its cathode circuit, which improves the differential effect dramatically. A 'long tail pair' generally will not have a CCS and may have slightly different plate resistor values as well. The plate values are slightly different to compensate for the mu of the tube type and the fact that only one input of the differential amplifier is being driven. These things are done to achieve a symmetrical output. 

When a CCS circuit is present then the plate resistors can be the same value. 

As many of the suggestions do not have remote volume control, I am offering a stand-alone remote volume control that will work with just about any amp. You can see it on my Instagram channel… worksbau.