Tubes are not exact as two identical units may be totally different. Your ears and an occasional tube testing will let you know.
How long should Pre amp (12au7) tubes last in Rogue Preamp?
I've always heard Rogue equipment drives tubes hard. My RP-5 (purchased in OCT 2017) still sounds great with the stock JJ's. No distortion or any added noise. Typical life (in hours) of general 12au7's for a Rogue preamp? I may try the newer Gold Lions next time, although I am happy with the sound of the JJ's