I've got some gigs in the fall and want to have some extra tubes on hand in case my SFBMR goes down. Currently I've got a couple EHX AX7's for the preamp stages and Groove Tube 6L6GC's for the power. Fender's circuit specifies "7025" for the preamp stage. I've read that 7025 is just what Fender called the 12AX7 tubes it sold. Does that mean I could use an AX7 like this in its place? http://www.thetubestore.com/Tubes/12AX7-ECC83-Tube-Types/Genalex-Gold-Lion-ECC83-B759 As for the 6L6GC power tubes, how much advantage is there in having RCA NOS's in there instead of the Groove Tubes I've had in there since the 80's?