Aesthetix RCA Phase output question

thanks Albert,
Recently I have read in Absolute Sound that Io sounds much better in single ended mode both in and out, what is your experienced, in my system rca in and xlr out sounds better than all rca. Rest of my system Tenor Wp75 balance connected to the ref 2 & Amati Homage
Andrew

Great thanks, Just started to get NOS for my unit,
got two red base 5692 GE (used)from TubeSeller but steal prefer Russian, I guess this pair is not as good as brand new red base NOS RCA version, also buy some Mazda chrome plate 12AX7 and again I was disappointed, they where very bright.
I may have to tray Tele instead. I do believe in NOS tubes, I used to have ARC LS25 before my ref2 and used it with Mullards 6922 it was great improvement, I would not consider to listen to that preamp with out NOS tubes, by the way do you know good reliable place to get set of NOS tube you have recommended on Audiogon for Aesthetix?
Andrew