Hmmm..I do see your point. So I take it a 6N3 cannot be easily substituted? It looks just like a 6922, but I'm guessing they aren't compatible?
I already took out the EL84's that were in it - they sounded way too bright. I put in some EH EL84's - much better. I'd like to try replacing the 6N3's too, but I guess I can't, eh?