Has anyone compared K150 tubes and the stock EL34s in Primaluna integrated/amplifiers?

Question. Any tube sets (kt88,el34,etc) that are better for low volume listening? Probably 30% of my listening is at low volume. I currently have a Pioneer EQ that I switch on ( true bypass switch) for low volume that fills in the low end. I plan on keeping it in the chain when I go with tubes. 

Just bought a lightly used matched quad of Tung-Sol KT-120 for my Primaluna Dialogue Premium. Initial reaction is wow, where did all that bottom end come from?   Next reaction was where did that sweet accurate midrange go?  
Looking for something in between. KT-88 maybe?  
I still have a lot of listening to do before I really get a clear opinion on the KT-120. If you are looking for extra punch the KT-120 makes a positive initial impression. 

Jambalaya 

that's good to hear because I want to avoid losing the midrange sweetness too.    

I'm wondering if I combined the KT120 with Cifte 12AU7s what would happen to the midrange.  Did you keep the stick 12AU7s when you replaced the EL34s?

I'm going to try the following by next week: 

Pre-amp section:  Swap out stock 12AU7s for new old stock Siftie 12AU7s 
Amp section: Swap out stock EL34s for reissue Mullard EL34s.

I'll follow-up with thoughts asap.