[Arran]

Brenda;
  As far as I know Sovtek 6L6 tubes are electrically the same as the U.S ones (the Sovteks are re-badged 6P3Cs made in the Reflektor plant I think) , I think the same goes with the China 6P3, other then in build quality. What I wonder about though is how the Soviets denoted the differences between different types of 6P3Cs, such as between a G and a GB, etc., I don't know if they had metal ones once or not.
Regards
Arran