Regardless of the brand or source, when you use tubes in high performance tube equipment the tubes should be vetted. They should test good on a tester and then they have to be auditioned for noise, microphonics and crackling.
If these things are not done its the luck of the draw. A bad tube that is of a good brand won't have a chance against a good tube of a lessor brand!
So wherever you get your tubes from, make sure they have a warranty and can be returned if they don't work out!