300B tubes for Push Pull amplifier

I red that tube perfomance depends on the amplifier circuit.
Well, I have a very rare Silvaweld 300B Push Pull Monoblocks so I want to buy 300B tubes for push pull circuit.
Do you have any experience? I saw that Nagra use JJ in the new 300B PP amplifiers.
Chinnese or Russian tubes?
All 300B reviews I red based on SE circuits.
I will apreciate your recomendations.