I'm currently using my Primaluna Dialogue 1 with NOS Russian 6n3c-e output and Amperex Bugle Boy 12au7 and Sylvania 5751 3 mica black plates. The speakers I have swapped in and out at various times are: Tekton Lore, Tekton 4.5, Infinity Prelude Compositions, Sound Dynamics 300ti. My brother brought over his Harbeth HL5s along with his Leben CS600 integrated for a weekend of listening, swapping various stuff around. Great time.