Identifying Genalex KT66 matched pair question - diyAudio
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Old 1st May 2014, 11:05 PM   #1
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Default Identifying Genalex KT66 matched pair question

Hi all, I recently acquired ~300 mixed NOS tubes/boxes from my grandfather and have begun identifying exactly what I have as I knew very little about them before this. I have a pair of Genalex KT-66 tubes that test new on a Superior Instruments TC-55 tester. My main question is how to identify if I have a matched pair? There are no distinguishing marks on the boxes themselves but on the inside of the boxes both tubes are protected by a folded sheet of cardboard which has a stamp of 'BK5C' on both protective wrappers. Does anyone know if this signifies that they are a matched pair? I would very much appreciate any input at all. Thanks!
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