Rolling KT150s in Primaluna hp integrated

Thanks George. Primaluna endorses the use of KT150s.

That's good that you said, they say it's OK, because that's is then it's under warranty for owners to do it with peace of mind. 

Cheers George 

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.

That’s interesting Wolf. I’m thinking the 150s sound a bit more solid state—in good ways and bad. They seem to be a marvelous tube in their own right. 

Now you have me wanting to hear the 120s too. 

Jb I feel the KT 150 tube is about as ideal an output in a pp design for my purposes. I recently installed a matched quad of cryoed 150s in my quicksilver silver 88s for further refinement, such subtle nuances were further revealed. Don’t really know what is going on but I can’t imagine things getting much better. I hear no downside but then again tubeoholics have different goals and values in what their focus is. It is definitely not a "tubey" or unduly colored tube for those inclined toward that end. It just sounds more like real music to me.

tubegroover,

I appreciate exactly what you are saying.  I think the KT150s are super musical. They are as close to neutral in coloration that I've heard in power tubes.