Well, got the tubes and they sound sweet. More open and spacious, makes me think of Fender Deluxe Reverb. That's the clean channel and on the dirt channel it sounds like a chainsaw rather than being fuzzy. I did the a/b with the (stock) Rubys and they sound dark compared to the GTs. I think it was a good buy and a fellow on another forum says it could be TAD 6L6 GC blackplates relabeled by GT.

I didn't bias the tubes and I think they're biased cold anyway. Gotta find a tech to bias them for me.