NOS tubes

Since the Rogue website says it requires two 12AU7s, you can try those Philco tubes in it and see if you like the sound better than with whatever tubes are in there now.  (Philco may or may not have made the tubes but they were apparently packed at the Philco plant in 1959.  This is not a provenance normally associated with greatness, but surely goodness.) It's not rocket science or even electronic science. As to the alphanumeric codes on those JAN boxes, I have not the slightest idea how to interpret them but most likely they pertain to location and date of manufacture.  Nothing mysterious. All the NOS JAN tubes I have, of various types, also have such a code on the box. I never even thought about it before.

JAN refers to what you stated and built more rugged to meet their needs. 

  Your question has been answered. FWIT I have a small system with a Rogue RP-1, Had Inspire , Zu Omens, Schiit Yiggy , Thorens TT. Tube rolling is system , room , and taste dependent. Most go for polar opposite’s which is Tekefunken Vs Mullard. RCA  is a nice compromise. If Brent Jesse’s site is still up read the 12AU7 page description of how they sound. I think I’ve purchased about 10 pairs of          12 AU7’s playing with my Rogue. Cheers , Mike B.