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New tube for AKG Solid Tube

We use an AKG Solid Tube in the studio as well as on stage and it just occured to me that I should perhaps have an extra tube just in case. My question is; does it matter what brand of tube I use? Can it make a diiference? Or should I just go to the music store and get any old 12AX7.
Thanks in advance. Your expert advice is appreciated.