Rolling KT150s in Primaluna hp integrated

jbhiller
  Are you saying that you think it's a problem based on your personal review and expertise? I'm having trouble understanding your point.

I've had tube amps come to me for repairs on the heater circuit too many times because customers have put in more powerful tubes and not bothered to see/check if the heater has the same current draw as the tube it was designed for. They think if the tube is interchangable it must be fine. 

And in this case the KT150 can have 30% more heater current draw over the EL34, on the rectifiers and heater winding of the transformer. This sometimes doesn't show up as a fault till it's been used/cooked for a while.
Tell tail signs are the power transformer is quite a bit hotter or you can smell something that wasn't there with the EL34's 

In case you did know the hottest running section of a tube power amp is the heater circuit & filaments

Cheers George        

Thanks George.  Primaluna endorses the use of KT150s.  With your background, you may be interested to see how they run their tubes and how sizable the power transformers are for the application.  

My KT150 got an endorsement from my wife. She said that they look like my speakers, Vivid Audio 1.5. 
Nice to know that they are a visual as well as audio match 🤣

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.