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In my experience, some manufacturers build better tubes of certain varieties. IE: I feel that TungSol made a superior 6L6GT/5881 sounding over the G-E, Sylvania and RCA's I tried. I'll take some Sovteks or Svetlana's over NOS on some tubes too due to a recurring problem with microphonics or durability. So, it would make sense that in receiving tubes that some may be better than others. A person would probably drive themselves crazy (and into the poor house) trying different brands in some of the old color chassis!
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