Going from one stereo Primaluna Evo Amp to Monoblocks...

I have no experience with the eco series but I have a pair of Dialogue Premium HPs. Started with one and recently adding a second one to monoblock them. It’s an amazing improvement. Better soundstage, more weight to the bass, more texture, more separation and more dynamic overall. Only issue is tube rolling is ridiculously expensive.

Nice! Did you go NOS for the Mullard and the Brimar? Did you change out all six on each amp or just the two driver tubes on each amp?