This is Telefunken smooth long gray plate 12AX7 ECC83 tube. Tube tests NOS on my Amplitrex and is balanced between both triodes. There was zero grid or H/K leakage.
This is a Mullard (Made for Bogen) 6EU7 tube made in Great Britain. It was just tested on an Amplitrex digital tube tester. Tubes had zero grid leakage and H/K leakage…excellent.
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