Well, I'm still in love the macs. They're better than my knight kb-85, and they're better than my scott 296. I have a 8 RCA 6L6GCs...they seem fine, but i have no way of matching/testing them. Is okay to run them in the amps? Obviously, if they glow funny or make noise that's no good, but if things sound good and the amp tests okay, does matching the outputs matter all that much?