“O” Getter Tube. (made for Zenith Corp.). TESTED NEW NIB NOS ! GREY PLATES. TUBE’s TEST RESULT’s TV-7/u Tested. I tested these on a High Quality Professonal Hickok TV-7/U Tester TESTED WITH a (TV-7/U) FOR GAS, SHORTS, AND MUTUAL CONDUCTANCE AND ARE MOSTLY STRONG TUBES!
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