I would listen to Aniwolfe. He and I both have been rolling tubes. He is more experienced than myself in the 12AU7 area so he is a good source of information. Also there is a review of the Dialogue Premium in Stereophile talking about the upper midrange glare and the reviewer swapped out the stock tubes to combat this problem. I don't agree with his KT120 power tube choice but to each his own. I can't remember the 12AU7's he tried. I would start with cheaper tubes and/or call Upscale and let them guide you.
Primaluna dialogue premium HP tube rolling suggestions to reduce brightness
I have had the dialogue premium hp for about 6 months now, using naim preamp and proac tablette anniversary speakers. I have been noticing some brightness in the high end, and am wondering is I might be able to switch out the tubes to cool it down a bit.
I am running the stock el34 and 12au7. As this is the hp with 8 power tubes, I would rather not switch the el34 for financial reasons, so does anyone have recommendation to change the 12au7 tubes.
I also think the the proacs are contributing to the brightness, but would rather not go speaker shopping again, but have not eliminated that option if you have some ideas
I am running the stock el34 and 12au7. As this is the hp with 8 power tubes, I would rather not switch the el34 for financial reasons, so does anyone have recommendation to change the 12au7 tubes.
I also think the the proacs are contributing to the brightness, but would rather not go speaker shopping again, but have not eliminated that option if you have some ideas