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In Reply to: RE: Russian substitutes for 6922 and 12AX7 tubes posted by Mechans on January 10, 2017 at 04:11:50
...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.
Follow Ups:
Could it be that all of those tubes were made the same but now the factories are not testing and rejecting the bad ones but shipping them instead?
I recall pictures of large piles of rejected tubes being destroyed at American factories back in the old days.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Certainly the outgoing quality requirements have been reduced (my impression, plus from talking to some personnel there), but also some special materials are no longer available. Maintenance on factory equipment is most likely not up to the same standards either.
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