Interesting. Now I have the Jadis Orch Reference, has 4 KT90's, very nice. Have not heard the KT88's. So I plan to get a DA60 with 8 KT88's (I believe thats how the amp is listed), so will I expect less bass on the Da60? I doubt it. I guess its all relative. IOW's you may get a tint less bass with the 88's, but then the 88's might deliver a slightly stronger mid, and/or more brilliant highs. So always a trade off somewhere. Stay with what you have. If you want more punch get another amp, change in tubes will only make a miniscule difference.
KT90 experience?
I've heard that the KT90 tube delivers more power than the KT88...anyone have any experience with this substitution? I've read the other postings and it sounds like I can expect more of a "solid state" sound...specifically, I'm looking at the new EH KT90 tube (I'm using their KT88 now with good results, but feel that my speakers could use a little more punch). Any responses appreciated.