I would roll the two center 12au7 tubes before modding.
DeKay
Mods to Primaluna Evo400 preamp
Has anyone modded their Primaluna Evo400 preamp? Or a similar preamp / integrated?
I'm looking for recommendations to tweaks. Does changing the input jacks to higher quality, or swapping capacitors help?
I am enjoying this pre, and have locked into a supply of 12AU7 tubes. I don't see changing it anytime soon. So therefore, it's time to mod!
Finally... if anyone has a circuit diagram, that would be super helpful.