1 - so far RTF df97 + Philips DL92 is my prefered combo.
I believe that I hear some details and instruments that I did not hear before (expecially with pinkFloyd's "shine on your crazy diamond" ). Does this make sense ?
( I don't know if it is the quality of the Combo, or my ear that get more and more aware/educated, or... effet placebo ??)
2 - and I have to admit that the Mullard DF91 + Philips DL92 do not provide me with this level of detail more " soft edges " Does this make sense ? ( But I will have to wait few hours of burn-in before having a final opinion.)
3 - And next, I will test RFT DF97 + PHILCO 1S4 and Mullard DF91 + MAZDA 1T4 when I receive the PHILCO and the MAZDA already ordered.