@ghasley - Thanks, indeed there're 8 tubes.  So much for my college algebra ;-) 
I recently bought an  EVO 400  PL  preamp  which is connected to an Audio research VS-115 amp with  Silnote Morpheus Reference II silver XLR's . An amazing combo.  Excellent bass, midrange and top end extension. Very quiet preamp. 
For what its worth, I have the EVO400 Integrated; now running KT150s, and Mullard tubes on the two front; it's glorious.

I spent a few weeks with the stock EL34s; and their midrange and holographic presentation is undeniable, but I prefer the extra "oomph" of the big KT150s; I didn't realize I was adding a space heater to my room but se la vie.

THIS is the sound I've been after for 40 years.. so beyond thrilled with the amp; also nice Im in SoCal so a trip to Upscale is only 45 min.. comparing to other amps its a no-brainer IMHO.. best bang for the buck in tube land. 
curio -

I could not be happier with the Evo 400 preamp. The 400 power amps as well. The choice of balanced / unbalanced inputs and outputs is great to have. The sound I’m getting is ultra-realistic and full bodied.

I am using expensive power cables and interconnects, and I have applied my favourite tweeks to the PL chassis and connections (well documented by me in several of my recent posts). I’ve really pushed the limit as far as I can. The upshot is, the Prima Lunas are magnificent straight out of the box, and can easily be made significantly better if you are so inclined. I like that aspect.

The build quality and the quality of components inside the amps are second to none. I really can’t imagine anyone being disappointed with the PrimaLuna level of quality and construction. I’m so glad I decided to go with the Evos - they are up there with the best I have ever heard, at a price that makes you wonder how some other brands can even survive against that kind of competition. Some may prefer built in the USA (but not for quality reasons, I venture to add).
Thank you @whostolethebatmobile .. I can't wait to have my Primaluna Evo 400 preamp. I already ordered but it seems our distributor (Italy) doesn't have one to sell till end of june .. so I'm reading everything concerning tube rolling