Different sounding 6922's- Best for ARC ref one?

SO I'm about to replace the stock 6922's in my preamp and I'm new to the tube world. Can anyone elucidate the characters of the differnet make 6922's that I might use in the ARC ref one Mk 2.
This is a hard question to answer. One, there are lot's of tubes. Two, tubes can sound different in different gear.

Try reading this for some basic info. http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html.

Also, I'd call a tube dealer or 2 and get their opinion.

Bruce at BWS has been very helpful to me and several of my friends. http://www.bws-tube.com/

Good luck. Retubing from stock will change things...