Questions on KT150 tubes

I also own a Primaluna Dialogue Premium HP integrated amp.  I play vinyl on my Pro-ject Extension 10 and listen through the Volent VL-2 monitors.  I bought the Primaluna with the stock EL-34 knowing that I would swap all the tubes out upon set up.  I did.  I replaced all stock Primaluna 12AU7 tubes with NOS Telefunken.  Now I have a HUGE soundstage, incredible detail, and 3D imaging.  I replaced the primaluna stock EL34 tubes with Shuguang Treasure KT88-Z tubes.  Wow!  Talk about real bass slam!  These KT88s also offer very extended highs and a natural mid (female voice).  Several LAOCAS friends have come over to the house and have thrown everything they had at the system to find fault with it but to no avail.  Very happy with this tube set up.  I did run the EL34 tubes to compare with the KT88.  While the mids in the EL34 tubes were very lush there was a distinct lacking of real bass snap.  So, I am still searching for the Holy Grail of sound -- like we all are.  I spoke with Kevin Deal at Upscale Audio (Primaluna importer) and he said that he is running the KT150 tube in his Primaluna Dialogue Premium HP integrated.  Kevin affirmed this thread -- that the KT150 has incredible bass slam, very well extended highs, and well tempered, natural (not sweet) mids.  Because the Primaluna runs the power (output) tubes so easy (8 tubes for 78 WPC vs. the 4 tubes in the Ayon Spirit III) he says that they may last 10,000 hours.  So, for the money the KT150 seems the tube of choice.  Just hoping that Santa reads this post!

This is what to expect to hear in an EL34, KT88, KT120, KT150 tube:  EL34 -- warm lush sweet mids.  Nice bass and highs but without the bass slam OR impact that may be desirable for rock and classical music or even a nice jazz drum solo.  Minimal, but reasonable bass and high extension.  Fine imaging but not jaw-dropping.  KT88 -- much more bass slam and bass extension.  This also holds true for the highs.  Greater sparkle than the EL34.  Mids are dryer than the EL34 (sweet, like candy) but female vocals are very natural and in-your-room present.  Imaging is more precise and detailed than the EL34.  The KT88 offers a bit more power, too.  KT120 -- a somewhat digital sound.  When this tube was first introduced many tubies scooped it up for the increased power.  Fine.  But this digital texture pushed many tube rollers back to the EL34 (much more musical, warm, lush mids,etc.) or even back to the KT88 depending on bass impact preference.  But now that the KT150 has appeared.  The KT150 offers more power and a longer life than any of the above mentioned tubes (about 10,000 hours in a cool running Primaluna amp).  The KT 150 has killer bass slam and extension.  The highs have a clear and very present sparkle (love the clocks in DSOTM).  Imaging and sound stage are alive, full, detailed, and 3D.  Jazz, classical, and rock listeners will really love this tube.  Mids do not have the syrup that the EL34 has (a deal breaker for some listeners) but IMO they are natural, forward, and glorious.  Truly, the KT150 is the tube of choice for those who want excellent bass power and extension, crisp highs, detailed mids (not sweet), excellent imaging, and long tube life.