DeForest Audion. TYPE GLOBE ENGRAVED BASE Tube! 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!
DeForest Audion. TYPE GLOBE ENGRAVED BASE Tube! 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!