I got around to doing a little sample of each for comparison. !952 RCA's vs some pretty darn good sounding JJ's. The difference is subtle but definitely there. Whether or not the monetary difference is worth it is subjective. This is the first time I have spent this kind of money on tubes so I am a bit of a nu-be. Here is the rig, Ampeg J-20 through a WGS G12q, Guitar , a touch of delay then amp. Bridge pickup of course, Same settings . tell me what you think, or can you even tell? NOS first JJ's second.