Questions on KT150 tubes

Lots of amps with 8 power tubes seem like nice things, and I've lusted for that Cary 120 amp for years (I guess after a Cordesman review), but doubling my power tube cost and amp heat output (I think even if tubes are driven less hard they're still little space heaters…unavoidable) is somewhat off-putting, although if a really great deal on a 120 came along…hmm...Besides, my "el cheapo" (seriously) Jolida sounds so good (dynamic snappy tube power, inaudible noise floor, accurate tone) I don't mind keeping the damn thing for a long time, thus freeing up cash for the "next great power tube" outbreak. 

I have a PrimaLuna Dialogue Premium (non HP) running all stock tubes. When I bought the amp I had Kevin send some TS KT-120's. After running the EL34s for awhile breaking in the amp and tubes I switched to the 120's (burned in by Kevin).  Definitely a difference but once I got a feel for the 120's, not sure if I am liking the overall sound. The 120's have a midrange glare or upper energy I am not finding pleasing so instead of buying input tubes to offset the midrange energy, I put the EL34 back in and the midrange is very very pleasing.  So I am not sure if the KT150 midrange is a lot better than KT120?  If not, proceed with caution. Also Kevin told me that the 120's over the EL34 you will gain 1db so if your looking for power he basically said its not worth it. I guess what I'm saying if you like the sound with the EL34 then you may want to think long and hard about the 150's. This is of course if the 150 midrange isn't leaps and bounds above the 120.

Are you saying personal preference plays a part in tube selection? THAT'S INSANE…If 16 people say 150s are what you should like, you should simply put them in and suck it up…even if in your rig they sound like an utter cacophony of screeching dog bleat, there is little room in high end for naysayers.

I assume you are answering my post Wolf? If so, all I'm saying and another poster here has the same opinion (doesn't mean its always right) before dropping $400 I would proceed with caution unless you KNOW the 150 is a much better tube. Also there are lots of naysayers everywhere so take it with a grain of salt. However, mileage varies right? 

I have a pair of Quicksilver Silver 88s using the Kt-150. I bought a quad of Genelex Kt-88s for use in a pair of McIntosh MC60 amps I also have on hand. My thinking after having the Kt88s was "why not try in the Silver 88s to compare with the Kt150s?"  Look, Mike Sanders, designer of the QS hands down prefers the Kt150 over ALL outputs that can be used in his amps. I say the KT150 is HANDS DOWN a much better tube in all respect to the Genelex in direct comparisons in the QS amps. I can't speak for Primaluma but expect the results would be similar, it's a better tube more plate current, more power more EVERYTHING.

Realist all I can say is break down and purchase. I find it extremely unlikely that you will not be satisfied. You want BODY, they'll definitely give you that and a lot more.