I prefer the sound of KT120s over 150s (I used 'em in both a push-pull and a single ended amp, the use of which was approved by the manufacturers of both amps) for reasons I can't explain as they're subtle, or I can't remember what they are. Something about the sound of the music when listening to it (take THAT pesky reviewers!). I like the "look" of 150s more…they're cool…however, another plus is that the 120s are relatively inexpensive these days.
Rolling KT150s in Primaluna hp integrated
I’m a mere five hours into these. This is an alive and kicking tube. It’s like it had a double espresso before the music starts. I’m hearing big and strong delivery, but that’s so overwhelming that I cannot focus on midrange. It’s clear I need some time with these.