I just put some Herbie 09's on my 6922's in a BAT Vk300x Integrated and also in a BAT VK-D5 tube CD player. I'm not sure how much difference I heard since the gear was still relatively new to me. But I am getting a 3-D soundstage with amazing space, air and instrument placement. I believe all those attributes improved with the Herbie tube dampers. The pricepoint is sweet enough that I am going to just leave them on. The Amperex tubes I am using deserve the very best!
If my Audiophile listening club wants to scrutinize the tube damper tweak some night, I'll do an A-B test with, and without them and ask the group to report on what differences they hear.
If my Audiophile listening club wants to scrutinize the tube damper tweak some night, I'll do an A-B test with, and without them and ask the group to report on what differences they hear.