PrimaLuna Dialogue Premium preamp owners!


Please help me. Looking for new tubes. I read that it is difficult to beat the stock tubes, but I am willing to try. I am currently running a Pass XA-30.8 amplifier, Harbeth Super HL5+ speakers and an Esoteric K-07 as a source. I listen to rock, jazz, classical. Love female vocalists accompanied by the piano as well. I want to avoid anything that will accentuate high frequencies or anything that may cause harshness in the upper registers. All that being said, I was considering Amperex Medical 12AU7, Brimar CV4003, Cifte 12AU7 or Mullard cv4003. Or something else? Thank you in advance.
tswisla
Mikirob message me sometime and let me know exactly what you will have for sale and prices please. 

Saki thanks for your thoughts. 
Saki70,
The Black Treasure 6CA7 much, much better than stock EL34 in Primaluna.