Hey Guys,
I have a MK I Herbert I picked up. The tubes were shot in it so I got new tubes. I was only able to get 1 - Mesa EL 34 STR 447 duet matched, 1 - Mesa EL34 STR450 duet matched, and duet matched mullard el34.
Is there an issue with running all 6 tubes in the Herbert? Right now each...