Hi all. In comparing the two tubes innards, I noticed that they are identical as far as I can tell. Is it possible the JAN or the Sieman versions were rebranded? Are they the same tube possibly? They even sound similar. Thanks.
JAN stands for Joint Army Navy. Tubes were taken from a standard production run and screened for closer tolerences. Only the tubes that met the military's requirements got the JAN desgination.
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