aniwolfe- I prefer the ultralinear mode, too, primarily because the soundstage is much bigger, which is why mini-monitors and EL34s have been at the heart of my systems for decades. What else is in your system, if I may ask?
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
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- 31 posts total
part of the brightness in the PL Dialogue and HP are the use of the SCR coupling caps. If you swap those out for Jensen Copper foil, you will get a midrange to die for and a 3 dimensional and airy top end. The first AU7 (center two tubes) will have the largest affect on sonics, so maybe start there first with some Mullards. The 2nd and 3rd position sockets will have a lesser effect on tonal balance. Perhaps as some others suggested, use some RCA clear tops (used by many organ mfgrs back in the day) in those other slots. |
meiatflask Hi, to answer that properly without guesswork, I tried to find an impedance graph of your "proac tablette anniversary" speakers, but with no luck. While they are factory rated at 8ohms there could be dip/s maybe to 4ohms maybe in the power regions, and the 4ohm tap from your amp then has a better damping factor (output impedance) to control them at that frequency. Just go with the 4ohm tap in Triode mode, as this amp is questionable for capacitive stability in Ultra-linear mode. As Stereophile has stated, if you find you don't have enough power, look to either more efficient speakers or a bigger amp. Don't go wasting money on different tubes they will not fix the instability in Ultra-linear mode. Cheers George |
- 31 posts total