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New Tubes?

As Ive stated before,I own a used 2000e and was considering replacing the tubes,I was able to locate a pair of J.J. ECC 81 12AT7s(new).
Im getting ready to lay vocal tracks,
1. Is there anything I should look out for as far as replacing the
the tubes
2. How many hrs of use on the Seb before they brk in?