Well when I say Russians I mean the 6n23p - and that's a pretty vast universe. Some dim stars, some bright stars - some super novae. I tested the Upscale Ulm '60 E88CC platinum, some additional Ulm '60's E88CC's and even on e step better the very rare (and super expensive) Ulm '60 E188CC's. And two very rare Russians beat them all handily in my system. These are ones being raved about right now on Woo WA2 tube rolling thread. http://www.head-fi.org/t/393811/woo-wa2-tube-rolling-recommendations/495 My tests were with the Lyr. So for the details I suggest my 17 6922 tube shootout review http://www.head-fi.org/t/761078/6922-tube-review-17-top-6922-6n23p-e88cc-cca-7308-e188cc-tubes But the bottom line -these rare Russians had the greatest detail coupled with the finest tone I have heard in a 6922 type tube. And I have rolled over 50 different types.