Really...My favorite power tube is reissue that's not widely popular

@soundermn 
Awesome, glad you found out your favorite tube and personal nirvana, even if it was with the original EL34! Funny, I tried KT150 in my own amps (VAC 200iQ) earlier this year, and like your case they came in dead LAST of 3 sets - versus Tung-Sol KT120 and Gold Lion KT88 reissue, in my case. The bottom end was VERY powerful, dynamic, and punchy, but in the end it just swamped the music and sounded unbalanced. Sounds like my amps were really designed for KT88, but the KT120 are similar enough and actually eek into the #1 spot for my tastes. The KT150 just sound like a different species compared to those two, but I realize they might be amazing in amps designed specifically for them.

@noromance My experience was similar to @mulveling .  But, it's definitely speaker-dependent.  Before the new speakers, I had B&W 803N and then Revel F208.  For both of those, the KT150 was better than EL34 overall, although I'd say that the EL34 did have a sweeter midrange (or it seemed that way because the bass was less punchy).  KT150 retained a lot of the flavor of the EL34, but had more punch in the bass, well balanced across all frequencies, and IMO better control of the speakers.  When I moved up to the F228Be, the KT150 sounded good until I started to compare.  The 7581a are really nice (better than KT150 overall), and really close to the EL34, especially in midrange.  But, somehow the EL34 seemed to have cleaner, deeper bass, and clearer, crisper highs.  All of that was definitely improved further when I got the TungSol EL34b.  And, on top of tha, they have that liquid midrange wonderful sound that EL34 gives you.  It's just better all around.  

Again, it was a completely different outcome with different speakers.  So, you have to try for yourself.  If you still have EL34 and 7581, do a comparison and see which you like.  

Interestingly, @mulveling , I didn't like the KT120 nearly as much as the rest of these.  I found them to have a certain "glare" in the midrange, especially around vocals.  For example, Mark Knopfler's voice always sounded a little "fuzzy" around the edges.  With all the others, that effect is completely gone. But, again, it is probably speaker dependent.  I didn't have any KT120s to try with the F228Be speakers, so I can't validate.  If it works for you, then spin some vinyl (or shiny discs) and enjoy the music!

Also discussed earlier in this post is the GL KT77. Well worth a try as well, an excellent alternative to the 34. Great mids like the 34, but with extended top end and bass and very refined. I never have been able to decide between the 77 and the 7581a since JB brought them to my attention...I finally solved it by switching back and forth every few months. Both are excellent, you can’t go wrong with either. 

soundermn-

Your setup looks good.What PL integrated is tube integrated? I thought the preamp was the only model tube rectified.
"PL HP Integrated
Vintage JVC VL8 with AT ART9 cart
Manley Chinook
Revel F228Be
Pair REL T9/i subs
EL34b power tubes
Cifte Input tubes
PL rectifier tubes."

I use the old RCA 6L6G lower power, big bottles in my PL HP. 

Primaluna Dialogue HP Integrated
Maybe "rectified" is the wrong word?  I only know enough to be dangerous sometimes...
@tablejockey