SYLVANIA, Made in USA
JAN CHS 6SN7GT CV1988 VT-231 Valve Tube
JAN Military Spec
Black Plates, Dimpled Foil Getter
Fully Tested on AVO VCM 163
100% Book Spec = Ia 9 - Gm 2.9
Ia 7.4/7.7 - Gm 1.5/1.4
Used, Supplied in White Box