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

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.

What did you think of the Cifte 12AU7 and reissue Mullard EL34 JB?  I tried this combo and found it sounds very good but lacking in bass weight. Overall the sound was very clear and concise but the Mullard doesn't have the bass of even the stock PL EL34.

@ samzx12

I have had the Mullard El34 Reissues in the PL Dialogue Prem Int Amp and felt the bass was ok. My biggest issue were cymbals(high freq) sounding rolled off at times. I then ordered the GL Kt77 and felt the treble was excellent and so far the bass is a little bit better, but I still need more break in. I only have about 70hours. Supposedly they need over 100hrs for the bass to appear.

I just recently got Cifte 12au7's. They have over 100hrs on them. I was surprised how smooth they were. I find them to be very musical. I was expecting from everything I read to be a thin, overly revealing type tube. They are not the thickest sounding , but are also not what I would call thin. I feel they are JUST RIGHT.

Great question regarding the Ciftes. 

When I had 4 of the 6 tubes being Ciftes, I felt that the sparkle and top end air were great but I felt there was a need for some syrup in the midrange and the low end was more subtle. 

I found two combinations worked well. 

1. Center two slots Cifte 12au7s, next inner two slots RCA black plates, and outer two slots any decent tube. 

2.  Center two slots Cifte, next four slots stick Primaluna 12au7s. 

This was kind of a blessing discovery because 6 Ciftes across the board are pricey. 

Just 2 Ciftes seems to be right in my room with my setup. 

Now, I can't say too much about the Mullard reissue EL34s as I had them in s week and then Gold Lion KT88s in for about a week. I will say though that the reissue EL34s were great to my ears, same as the GLs. 

I was was really surprised with the reissue Mullards. They sounded great to me. Tighter and more control than the stock PL EL34s.