without the 300B for scale the family looks pretty pedestrian and it doesn't really hit home until you see the basic autoformer sized lam in the picture for comparison.
The last box is the one that made me nervous since it actually cost me some real money and since they were not fully tested they represented a bit of a risk.
I must be living a charmed life these days since not only do they test perfectly, In circuit they are nearly matched (13ma & 15ma) which is very difficult to get. Given a random sample of 10 tubes, you would be lucky to get three pair this close and for a given 150V B+ and -2V bias you might see a pair at 10-12ma a pair at 18-20ma and a pair at 28-30ma. They all sound great but man they are all over the place.
dave... knocking hardly on wood.