@jjss49 perfectly worded my observations.
@mulveling 's advice matches my experience. After using I number of 6922/6DJ8 and other "roller" preamps, I found more satisfaction with a 6H30-based design, used in many BAT & Audio Research models. Some may see a downside in no compatibility with all the legendary, exotic vintage tubes. I've overcome that by wearing the Amperex Bugle Boy logo on a tshirt while I listen to my 6H30s. Cheers,
Spencer