Thanks everyone. I am working on building the amp and I'm planning to start with a simple opamp buffer to make sure everything is working ok and to use as a baseline.
I'm also trying to finish up a preamp project, so it will probably be a couple months before I am able to get back to working on a tube input board.
I'm also trying to finish up a preamp project, so it will probably be a couple months before I am able to get back to working on a tube input board.