Cheers for the reply :) By that do you mean they have a different overall signature to each other? Any recommendations on brands/nos or new with the 6SN7 tubes? If i can get a better synergy with my WA-6 and LCD-2 by tube rolling for the time being that would be awesome! :)
No worries. Yes, that is what I mean. The whole WA6 name thing is misleading.
6SN7s are cheap, common and plentiful with lots of threads already written about the various options. Currently I am using a pair of NOS brown bottomed Sylvanias and they are the best I have heard so far. I encourage you to do your own research and splurge a little (6SN7s aren't ridiculously overpriced yet). Tube-rolling is half the fun of purchasing a tube amp.
One note, the 6SN7s will need an adapter from Woo and also won't work with the WA6-SE if you do plan on getting the SE in future.