Anyone try KT150 in Primaluna Dialogue Premium HP

I was totally a triode-mode guy for the first 18 or so months of the 150s.  I updated my cabling all around the system to Audience SX (from SE), and I put a really clean pre-amp in front.  After that (I think it was the combo), I preferred ultra-linear.  I think all the things that ulta-linear wasn't as great at before was now totally an improvement and more "live" sounding.  Triode still sounds fantastic, but ultra-linear is just a little more "there."

If you are loving your 120s and don't feel like anything is missing, then I wouldn't touch a thing.  For me, the 150s were just a little bit "more" of the same...more scale for my smallish room.

I realize that this is an older thread but as I found myself today asking the same question as the OP, I thought I should chime in FWIW. I (too) have the DiaLogue P-HP amp (and DiaLogue P-preamp) hooked to Spatial M3 Triode Masters which in combination seem to be a bit lacking in the deep/articulate bass department (with five months of break-in). So I sprung for a set of eight 150s that will arrive this Friday (May 4). I’ll report back on my findings comparing the 150s to the stock EL34s. I had previously tried KT-120s but found them to be too abrasive for my tastes. Hopefully the 150s will bring the bass, retain the mid-range, and avoid the "120 harshness". If not, then I’m off to look at subs.

Strike that last comment: "I’m off to look at subs." I meant to say, I’m off to look at other speaker alternatives.

I think you will find the KT150's midrange will sound much better than the KT120. As far as bass the KT120 didn't have bad bass at all but like you are experiencing it had an annoying harshness I could never tame.