KT150 to KT120..or KT120 to KT150

@decooney  +1 very good description between kt120 and kt150.

I agree with others that, in part, it depends on the amplifier design.

The just released Zesto Audio Bia 200 Select has a selector switch with three positions; KT88, KT120, KT150 or KT170 with power output 60, 80 or 100W depending on tube and selector position. These amps ship with KT150 tubes presumably because that's what the designer prefers. It's nice to have the option of optimizing the amplifier for different tube types.

I have one on the way and look forward to playing about with all four tube types within the three operational options. My Fyne F703 speakers are relatively efficient so 60, 80 or 100W will be more than sufficient power.

@runwell So in total, you definitely can not say which one is better, but obviously there are two league, kt150. Or kt88,kt120.

runwell, I agree with your comments and description. The plan is to rotate the KT150s back in every once in a while. They are an amazing wide range tube with added depth, clarity, sound stage. Definitely in a class of their own, yes, agree.

However, the KT120s are a "throwback" to older familiar tube sounds I use to enjoy and expect from all of my former tube amplifiers with el34s, kt88. A nice tradeoff too.

I understand >> a lot better now << what some were reporting about why they liked or preferred KT120s over KT150s. There are different reasons I like and appreciate both - particularly when used with purpose built amplifiers designed to run them.

@vinylvalet  Do report back once you receive and have run in your new Zesto amp. I am particularly curious as to the difference between the KT150's and the new KT170's.

I would expect the amp to be basically idling when driving your Fyne's...with all the tube choices.

I went from kt120 to kt150. I just liked the sonics a lot more. Everyone has different ears and amps