Mine cam with 4x Ruby EL34s
I played around with a pair of Mesa STR440 6L6 as well as SED =C= EL34s, also just 2 instead of 4 Rubys, which is interesting as well.
All sound nice and interesting, but I am back to the stock Rubys now (as my taste was set to what I heard in the Shop).
It's great to have external test points, I'll go on trying different types.