My rogue set up is ST100 power amp with RP1 pre, so not sure if this is helpful. I've experimented with a handful of tubes in the 12au7 and 12ax7 spots and best combo for me without a doubt was Mazda 12au7 and Telefunken smooth plate 12ax7. I was actually surprised how much of a difference the 12ax7's made in the power amp. Brent Jesse tubes is a great resource btw, he responds to emails quickly, tubes descriptions on his website are very helpful, and he has a wide selection. Good luck!
