What brand of tubes should I try? I'm leaning towards NOS Mullards. Since I blew over $2K for this preamp, shouldn't I put the best tubes available in it? Telefunkin are considered as well. I am trying to go with one type, as it can be so frustrating to choose what is best for V1, V2, V3 etc. I love a tight metal sound, as well as a nice AC/DC crunch. The tubes I am running now are too muddy for me, which are an old Bogen/Mullard in V1, TS in V2, EH in 3 and 4 and an LPS in V5. I greatly appreciate any thoughts from anyone who has experience with this preamp.