Questions on KT150 tubes


Does anybody here have experience using that tube? Can you tell me how it sounds? I have a Primaluna DiaLogue Premium HP and it can use them but they aren't cheap. I'm running the stock EL34s and LOVE it but seems like this tube is all the rage. The Primaluna is unbelievable for its tube magic as-is. Also I wonder if the KT150 would last.

Also the best places to buy them. Not the cheapest. The best quality.
therealist
$269 a year ago for a "matched" (at the factory? A tube dating site?) quad of 150s from a very highly rated Ebay seller. Long live the hot pickle!…just crazy good sounding tubes. 

Wolf,

Before doing the SE upgrade to my Ref 150, I bought 2 matched quads of KT-150s from a respected tube vendor. 

Some pairs biased pretty closely; others were off by as much 6 or 7 mVs, which as I mentioned somewhere, is pretty close to the boundary of ARC's recommended range (between 57 to 73 mVs). 

IOW, if a set tube is biased at 65 mVs, the slave measured at 71 or 72 mVs. The max spec is 73 mVs.

Anyway, I only put about 200 hours on the KT-150s.  Am I offering them for sale?  Not sure.  ARC charges $200 per KT-150.   

I too have the Jolida Fusion 3502  
Bass on el 34 is tight and punchy,image depth and natural rich midrange without 
Question best with el 34  tube very important for top shelf input tubes
I use 50s black plate Raytheon 12ax7,and GE 5star phase splitter 12ax7 50s tubes
Much better then current made crap. Also Cryo ed tubes EL34 from tube man 

Same Chinelse company that make black treasures which are even better with exceptional Bass. I like a tube that does everything well including natural tone 
And image density the kt 150 can never do.one Big thing to remember Your Loudspeakers and ease of signal I have 94 dB Spatial audio  Hologram-3 
Using top Mundorf caps, reference compression driver with dual 15 inch drivers
Very Easystem load .lowest Xover800hz seamless. That is the key 
And EL34 bandwidth to 28hz with this speaker a exceptional match.
Your speakers efficiency ,and Xovers efficiency will dictate this. 
Just googled ~~KT150 Review~~ and brought me here, read through the posts. 
Only confirms what i figured out on my own reserach independent of the comments/experiences posted here.
I listened to the YT vids of the few 150's uploads( sure sound is compressed etc) still I can detect  that the 150 is the tube i want to roll next in my Defy7. I bought it with 6550's and never listened to it with that tube, as i had no preamp,,,yrs later i boughta  pre and decided to get the Defy up N running with KT90's, as i recall fond memories of that tube in my jadis Orch Refer,, the EIKT90's are over rtaed as mentioned by a  jadis expert here on audiogon.
So I just sold off at 1/2 price the 12 EHKT90's and am running the KT88, labeled ARC,,,a  bit superior to the 90. So I am looking for a  bit more soundstage for my full orchestra muisc.
I thought maybe the KT120;s..then I thought through a bit more carefully, as i do not want to make  yet another costly error,,,so i thought ~~~why should i even consider the1 20's, when fora  bit more i could get the 150's. 
After hearinga  few YT vids of the 150's. its certain its my next upgrade.
Sure the 88's are really nice. But since i am looking for ~~Nirvana~~ the 150 will voice the Defy's raw power and dynamics more than the 150's smaller brother, the 120.
The prices are stable at near $400 Sextet from 1 ebay seller. 
btw I have my cayin cd17 Mark1 in the shp/installing twenty  M SGO caps, the white  casing. Can not afford the much larger sized  Supremes, nor would they fit,,,,,even the whites are going to be jammed in/but doable,,,I will return to the shootouts twix top dog AX's and also  the AU's vs the E80CC's. ...back to subject,
The KT150;'s. ,,,,,,you do not see any used/good bargains on ebay,, = ~~a  keeper~ = ~~A winner~. could we say the 150 tube is ^^almost^^ approaching a  single ended tube sound, the 300/805/845 sound imaging?.