It's a strange world because you can pay a lot of money to do this . . . but it never actually sounds like a tube amp running at volume. I don't know if it's just how your ears hear things at high volumes, or if it's an interaction between the sound levels and the cabinet, or if it's the speakers behaving differently when they're pushed. It's not possible to play at bedroom volume with the tone of a cooking tube amp though, at least in my experience. I think attenuators have a place slightly knocking down volumes at gig levels, but they're kinda garbage for bedroom volumes (great at killing the life of your tubes though).