I wish I could tell you man. I haven't had my DR long enough. I haven't had a chance to run EL34's yet. I wish I could have held on to those dimple tops I had though. Those really rocked in the 2210. I bet they would have been nice in a DR. There again, they may not have been within spec for Mesa. When I slip some EL34's in I'll let you know. I can tell you that NOS JAN Phillips 7581A's are very nice though. That isn't helping your EL34 question though because 7581's are like 6L6's.