Why aren't new vacuum tubes as good as or better than old ones? Don't we have purer metals? Precision equipment? Why isn't anyone making the highly regarded 7316s?
All these new tubes are basically 845,300B, etc. If your looking at signal tubes like 12ax7,12au7,6922,6SN7, etc. the new old stock from the 40-60's sound way better than any tube from China or Russia in my opinion.
Yes of course the RCA's sound different than the Sylvania's. I don't know why that should be the case since factories know the specs on how the tubes should be made. It may be slight differences in materials or tolerance in the parts.
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