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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
meiatflask
leotis
183 posts
 
Hey George,
Thanks for showing those curves and explaining it.
Had been wondering what it was about ultra linear that seemed so unpleasant.


georgehifi's avatar
georgehifi
10,312 posts
 
leotis107 posts05-20-2017 1:28pmHey George,
Thanks for showing those curves and explaining it.
Had been wondering what it was about ultra linear that seemed so unpleasant.
Yeah for a tube amp, their not very stable in ultralinear mode as JA of Stereophile found when doing his bench tests measurements, and Art Dudley heard.
No amount of tube rolling will cure this, as it’s circuit/feedback/output transformer related, best to keep it in triode mode for better stablity.

Cheers George
psickerson
97 posts
 
Hey Georgehifi,

I own this amp and I have been running it in UL mode exclusively for over 2 years.  It’s sweet and I listen to it hours on end with none of what you are explaining second hand.  I would suggest to others to look at their speakers as being the culprit.  

My my ears don’t understand graphs only music.
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