Vacuum tube 12AT7 National (Matsushita) MT9 pin 2 tubes These have been stored for a long time. They were confirmed to be working in operating equipment and then stored. Heater continuity confirmed. These are not a matched pair. Of the two tubes, the printing on one has almost completely faded. Based on storage records and internal shape, it is believed to be a National 12AT7, but there is no definitive proof. There is dirt on the exterior. The dirt can be wiped off, but in the case of old vacuum tubes, the printing can easily be removed, so it has not been wiped. There is no original box. They will be wrapped in bubble wrap and shipped in a plastic case. #Vacuum tube #MT tube #12AT7 Management number V037 V038