I sold the < 1 hour pair already and still have both 6F8G and < 10 hours TSBGRP. They sound the same to me but the 6SN7 version have darker background and less prone to noise. They are shipped to my parent's house for storage, if you want them I can have them ship back to me. With the 6F8G, I can sell you the adapter that is wired for WA22. The wire are positioned away from the rectifier to prevent it pick up the noise from the rectifier.