Tube rolling for EAR 912

Hi, i've just registered here but have been a passive read'er for a while, and learned a lot in different threads.

I have recently bought an EAR 912 tube preamp and i want to experiment with different tubes (not because im not happy as it is, i love it... but because i can :) ). So i wonder if anyone have tested 6N1P-EV tube in the 912? And how did it compare to the original? I got the following quote from wiki, regarding this tube: "... excellent low distortion and low noise characteristics."

I am also open for suggestion to other types of tubes, but preferably only tubes that someone has heard on the 912.

Note that i am completely green when it comes to tube amps and tubes, theEAR912 is my first one.