First, get a good sounding processor. A lot of them are thin sounding, lack dynamics and bass. Anthem is not one of them. I’ve had bad luck with Onkyo and Emotiva, and find Marantz bright to harsh.
I also really llke Theta Digital, but it's hard to tell if they are even in business or not.
Second, they do make stand-alone tube buffers that can add the tube glow.