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Past years I buy matched pairs from many dealers now I run with
Tektronix matched {boxes,tape,stickers with same members an tube}
Siemens made pair 6DJ8 diffrence between this pair and others is
like day or night(samthing like you washing dirt windows with
Windex}.WHY??? I thing todays dealers dont matched tubes properly
or Tektronix do better them anyone else!!!Joe
Some dealers match their tubes using static matching: transconductance is measured at one given bias setting. Other dealers use dynamic matching: transconductance is measured over the whole range from zero maximum bias. Dynamic matching is more tedious but very useful for obtaining real matched pairs, quartets, sextets and so on.Sjef
Netherlands
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