Nope, I don't have those 6922s. The main equivalent types are 6DJ8, 6922, and 7308. The European equivalant designations are ECC88, E88CC, and E188CC. There are many others. The 6DJ8 is actually the "base tube" and the others are upgraded, military types. Supposedly the 7308 is the baddest of the bunch, especially the US made Amperexes. By that I mean "most stout". The best sounding are reported to be the Pinch Waist Amperexes from Holland, but these will set you back about $500 a pair if you can find them.
Siemens CCa tubes have a killer reputation but are hard to find, as are all the Telefunkens. Just about anything from Amperex Holland is considered excellent. The Siemens tubes often fetch $200 a pair and nice Teles are in that range too. Of course if you're looking for one tube it should be less than half the "matched pair" price.
Most of the US-made tubes are not considered as good.
There is a lot of information out there on this tube.
http://www.audiotubes.com/6dj8.htmhttp://www.audioasylum.com/audio/faq/joes-tubes.html#6DJ8http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1154646514&openfrom&1&4#1Of course the circuit the tube is used in makes a significant difference. The Amperex Holland 6DJ8 Bugle Boy is widely reported to be a great tube and a killer value, you can pick them up for $50 - $80 a pair. I bought some, they are terrific in the Lamm preamp but terrible and I mean terrible in the Isabella. They're far worse than the stock JJ tubes which are actually pretty nice.
I also have Amperex Orange Globe 6DJ8s which are really nice in both preamps and generally a killer deal in the $40-ish range per pair. The Tesla E88CCs are very nice as well, made in Czech Republic. They run around $50 a pair but I gather these vary some in quality. I still have some Telefunken 7DJ8s arriving today and a pair of US Amperex 7308s which should be here any day. They both stand to be excellent but are a little more expensive. Going rate for both types is around $120/pr.
Like any NOS tube, this family is like a rabbit hole, you get into it and the tunnel goes and goes. There are lots of types I haven't mentioned and there also significant variations within types from individual manufacturers. Some of the types are reported to be victims of forgeries and sales as "authentic". It's fun to play though, especially if you don't get into the stratospheric stuff.