Those are the more common Reflektors with dual getter posts. They're not bad and a quad for $24 - how do you beat that! Common characteristics of the Russian 6n23p: very quiet, highly durable, low microphonics (they seem to use a thicker glass then the Euro and US manufactures), good bass and dynamics. Now the best add high and low frequency extension, very high levels of detail (I hear faint background instruments and vocals deep into the mix - that I've not heard with other tubes), this high level of detail add to a three demensional holographic quality to the soundstage, the sound stage itself widens and deepens. Now the very rarest and best add a magical musicality, a natural flow to the music that is captivating - never harsh or etched. These rare versions are the best 6922 type tube I have ever owned. One caveat, do to the extreme detail and extension, some may find these a bit foward. It depends on your upstream source - mine is a pretty expensive computer server with a tubed dac. So it comes down to a matter or taste as always. In my system the Amerpex OG where soft with a tubby bass - I had better luck with Amperex USN-CEP white label 7308s. But in the end prefered the very best Russians due mainly to that magical flow they have. It's why I love tubes, the ability to reach that higher level of performance. I use the HD800 with the Moon Black Dragon V2 cable, but owned the HE500s for awhile. The HE500s have amazing performance, and worked well with my system. I sold because them mainly because the HD800 are more confortable and with the Black Dragon had better, wider soundstaging. The HE500 have excellent dynamics and are really good with vocals. I have not owned the LCDs, but from what I've read they are a bit darker then the stock HD800, the Moon cable darkened the HD800s, and 'cured' some of the treble issues some folks have talked about.
Would you send a photo or a link to this particular tube?
The one you say that is the best 6922 type tube you ever owned...
There's so many variants, i'm lost.