[Amps] 3-500Z quality and new 572B

[Hsu]

I just know the Chinese 3-500Z have a new  manufacturer, it located nearbay 
my home, just only 500 mtrs :D.
  Could someone can tell me how about  the tube's quality of new 
manuafcturer?
I'm disscussing with them about  new version 572B's deal, I think it should 
with shorter
electrode lead atleast (without  tube base like 3-500Z),any suggestion?
what 572B's capacity of the market a year?
      Hsu