Looking for high power warming sounding tube amps

I just read the Audioshark forum.  No difference in power per KT tube, interchangeable as well.  Preference apparently for the stock KT88 over other types and most NOS tubes except for V1 6SN7s

@fleschler I checked with Kevin (owner and president) at VAC before doing even demoing the KT 150's.  Kevin, by the way is awesome to deal with -enthusiastic, engaging, and available.  No problem at all according to him. No modification necessary.  I can't directly comment on tube life, because I have only run the KT 150s.  When I auditioned the amps, I didn't care for the KT 88s at all.  Best for chamber music I think.  I listen to rock, jazz, and blues which need a little more umph.  The KT 120's were better to my taste but the amps really started to sing with the KT 150's.  Bass in particular.  I have had the amps for 6 years and had to change tubes only recently.  I've checked the expected tube life of KT 150's and my tube life is in the ball park.  Hope that's helpful.

@orthomead Thanks for the tube life at 6 years.  I listen a minimum of 2 hours nightly, more than 800 hours annually. 

I have 2 EAR 890 amps but they sound great with classical chamber/orchestral, vocal/opera/pop, jazz (traditional to post bop) and 50's to Led Zep rock-so every type.  They run rather warm (2=4 degrees room temp rise after an hour).  A pair of VAC 200IQ have more power.  I have not  compared the two sonically and have not read of a direct comparison either.  

@fleschler I'm not as fortunate as you in terms of listening time per week, probably on the lines of 6-8 hours weekly, so your tube life is likely to be less than mine in terms of time.  Like your system, my room does get a little toasty after a few hours. But that's when all the magic starts!

I spoke to Mike at quicksilver and he told me his amps are tonally neutral and that if I wanted a warm sound I should look elsewhere.