I've got EH 6CA7 (Lord Valve) for 2+ years in TOL 100 head.
Louder, cleaner than SED or JJ 34s, but don't sound quite as scooped as JJ 6L6s in my MICA 100 combo - even using same speakers -2 EV12L in ported cabs.
But MICA has V30s, so the JJ 6L6s are the perfect recipe