That'll work just fine. I do it all the time. If you go too weak you can lose some punch and dynamics, depending on how each amp is using it's tubes. Some of the dynamics of a tube clean, even if it's really clean and not breaking up at all, are from a slight, inaudible breakup right at the attack. Then you get some sag right after that. If you go too low with the tube type, it can sound a little more "solid state" sometimes. But it's all about the amp. In a dedicated clean channel like you have, I think you'll like it.