Tube replacement recommendations


Hi
I believe it’s time to replace the output tubes in my amp, looking for recommendations. It’s an Audio Note P2SE, 4 6n3ce tubes currently. I’ve never changed the tubes, and it seems like there are lots of options. Any advice is appreciated. 
mojojojoe
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I see they are Russian military and well regarded. Looks like the option you have is either buy new production or buy NOS military.