TUBE INFO: These tubes are Brand New in factory retail boxes from the New Sensor Corporation. They"re another fine example of the reproduction tubes NSC is producing under the Genalex Gold Lion trademark. Here"s what the manufacturer has to say about them: The Genalex Gold Lion E88CC/6922 is a premium grade selected small signal twin-triode that is a suitable replacement for all 6DJ8, ECC88, 6922, E88CC, and 7308 types. This tube features gold plated pins and is manufactured to extremely tight specifications, making it the highest quality current production E88CC/6922 available. Each of these tubes was checked out on the new Maxi-Preamp Tester which along with gain and shorts, also tests for noise, microphonics and balance. And double checked on vacuum tube characterizer from VTV.