6V6GT, SYLVANIA, MATCHED PAIR ,VT-107A, 10CV/511, GREY GLASS, BRITISH AIR MINISTRY 10CV/511 WITH 1950S GREY ENVELOPE SLEEVE

6V6GT, BRIMAR, MATCHED PAIR, BLACK GLASS, BROWN MICANOL BASE, WHITE BASE PRINT, CV511

6V6GT, BRIMAR, NOS MATCHED PAIR, BLACK GLASS, BLACK BASE, WHITE BASE PRINT, SAME FACTORY CODE, CV511

6V6GT, SYLVANIA, ,VT-107A, 10CV/511, GREY GLASS, 1950S GREY ENVELOPE