I've found that OPA2107 + Sylvania GB408A are really good too. The only thing is highs are really rolled off. I am not sure if this is with any op amp or just this combo. It's a bit hard to get used to but makes a very warm, fuzzy experience. My Shure SRH840's don't really like it but I bet treble heavy cans like my SR325i would love it. I need to try those but right now I'm enjoying a bit of warmth. Well, kind of enjoying. Hard to explain. There's that nagging that keeps saying "Where the hell is the treble?"
I still have no clue what happened with my M8083, they just sorta stopped sounding good. And they started completely losing track of themselves in busy passes. Like... system of a down would kick their butt. It was really wierd. And all this started happening right after I hyped them. I now know why FOTM happens. You speak just 2 minutes too soon. To anybody who bought the M8083 because of my suggestion, I'm sorry and I hope your tubes continue to sound as it did when I enjoyed it... though I will say I used them since I bought 'em. (looks like february 25th, so maybe 10 days later I put 'em in. Almost 7 months of constant use (which is probably nearing the 1400 hours mark). I'd say, just to be a bit fairer about it, that's probably more like 1200 hours, but that's a lot of time to put on a pair of tubes, I'd wager. I think I can understand why they started acting up. I think next paycheck I'll buy another set and see if the ones I had just died or not.
I think very least I owe it to myself to see if I had some kind of FOTM disease (but for that long?)
The OPA2107 were bought early june, so that was 3 months with that combo. I haven't enjoyed anything in my life that long I don't think. :\
Edited by Aynjell - 9/25/10 at 2:15am