Here is a list of all the balanced phono stages which have balanced circuitry not just the xlr connectors and/or transformer coupling that I have found, please feel free to add others or make corrections:
Aesthetix io (tube)
Aesthetix Rhea (tube)
Aqvox 2ci (ss)
Arc ph2 (ss)
Arc ref2 (tube)
Asr Basis exclusive (ss)
Atma-sphere mp1 (tube)
Atma-sphere mp3 (tube)
Ayre p-5x (ss)
Bat VK-P10 (tube)
Clearaudio Balanced Reference (?)
Ear 324 (ss)
Einstein tt choice (ss)
Essential 3150\
hagerman trumpet(tube)
Jeff Rowland Cadence (ss)
Pass Xono (ss)
PS Audio gcph (ss)
Simaudio lp5.3 (ss)
Whest ps.30r(ss)
Aesthetix io (tube)
Aesthetix Rhea (tube)
Aqvox 2ci (ss)
Arc ph2 (ss)
Arc ref2 (tube)
Asr Basis exclusive (ss)
Atma-sphere mp1 (tube)
Atma-sphere mp3 (tube)
Ayre p-5x (ss)
Bat VK-P10 (tube)
Clearaudio Balanced Reference (?)
Ear 324 (ss)
Einstein tt choice (ss)
Essential 3150\
hagerman trumpet(tube)
Jeff Rowland Cadence (ss)
Pass Xono (ss)
PS Audio gcph (ss)
Simaudio lp5.3 (ss)
Whest ps.30r(ss)