toddburke:
Having had a Ref 110 with WP 7s and thereafter a Ref 150 and now Ref 160 monoblocks, I can advise that the biggest difference in how the WPs responded to amplification was my move from the Ref 110 to the Ref 150 (not even the SE) in which I later installed KT 150 tubes.
With the KT 150s or the KT 120s, the Ref 150 added body to all images and slam to the bottom that made the Ref 110 sound wispy in comparison. You might want to consider a used Ref 150 as a very cost effective trade up in amplification in the future. The difference was quite profound.
Having had a Ref 110 with WP 7s and thereafter a Ref 150 and now Ref 160 monoblocks, I can advise that the biggest difference in how the WPs responded to amplification was my move from the Ref 110 to the Ref 150 (not even the SE) in which I later installed KT 150 tubes.
With the KT 150s or the KT 120s, the Ref 150 added body to all images and slam to the bottom that made the Ref 110 sound wispy in comparison. You might want to consider a used Ref 150 as a very cost effective trade up in amplification in the future. The difference was quite profound.