I've (still) been doing some searching around for tube electronics to integrate w/my GT-6b. I feel that a tube poweramp is more versatile since it can be used with different pres with or without the GT-6b. However (comma) I assume that the preamp and poweramp in an all tube head are designed to work optimally with each other, and therefore might work better with a multi-effect unit. Thoughts? Opinions? Experience? Help. It's either this or I sell all of my gear and go analog effects with a tube head.