I have some nearly new Ei KT-90 type 3 tubes and all four of them make some noise as if a little part is loose or something inside. You move them and a tinkling sound can be heard inside each tube. Is this normal?
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.