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Original Message
As the general rule...
Posted by Victor Khomenko on January 11, 2017 at 07:16:29:
...the Soviet tubes made before the USSR collapse have substantially higher quality levels.
I will not speak for the sound, as it is very subjective, but it is sufficient to say that we had to reject up to 30-40% of tubes in some current production batches. The results are highly inconsistent - there are good batches and bad ones - something we simply do not see in the earlier tubes, where the rejection rates are close to zero.
There are many reasons for that, the main one being that the tube production used to be one of very important military field, with its associated tough standards on everything.
Today it is basically a cottage industry, where every producer sets his own standards.