One final update. I grew tired of the Telefunken 12AT7. Too analytical and I still wasn't able to match the balance very well with them and I found out why: it's the middle 12AT7, the one supplied as an Ei tube. It's the single output tube and that's the one that was out of balance. I put one of the Telefunkens in there and everything just came together. I started out with generic Holland labeled 12AT7s to replace the Telefunkens and everything was great, way way better than the stock 12AT7s. Spent a bunch of money on Mazdas and frankly the upgrade wasn't worth the money. A bit bigger soundstage than the generics. Maybe a tiny bit smoother vocals. Strings are nicer by a bit. So technically better but I was very happy with the generics too.