Ok....now that I know I have 12AX7 that are NOS Sovtek in the L and R slot, which I assume are the right and left outputs, I have also a single tube off to the side...odd position in my preamp. its a 12AU7 that has China written on it, so I pretty much know its a nice sounding tube.

A friend of mine from Audiokarma sent me a 12AU7 Tulefunken which I plugged into the odd position and took out the cheap China tube. Man... voices and midsection seem to have opened up and voices are more pronounced, and the overal sound seems more lush.... And this from changing out the odd position tube for a brand name Tulefunken!

So what is each tubes job in the L,R,, and odd positions any way? Am I right in assuming the L, = left, and R=right..? IF so what is the odd tubes job? Thanks.