Hi, I agree that the E80 is not the same as an ECC82. However a larger question is IMO important. I get asked this question regarding some of my builds all the time. My answer is always the same....to my ears in my gear type/brand XX sounds better to me. I will often try to clarify why I think that. Like one is dull sounding, one bright, one warm and mellow one crisp and so on. But the answer can not be definitively related to your ears and your gear. Yes there are some brands that are bad sounding regardless of the gear, my suspicion is that they either are not the type specified or rejects. But a great majority of new tubes from reputable companies (both NOS and new production) the sound will be pretty good. Not identical, just good. So I hope someone out there will have your gear, at least one variable will be eliminated. As for your ears and preferences that is another story.