On a whim, without planning to, I bought a Herron Line Stage, it being unusual by the fact that it containd six 6922 tubes intsead of four. I don't have any clue if it sounds any different the later units that have four 6922 tubes.
By itself, it so dramatically improved the sound quality of my system I was, and still am, in awe of what it was able to do.
So impressed, I just bought a Herron phono stage.
Maybe this tells you something.
Regards,
Dan