6H8C, RUSSIAN 6SN7GT, MARKED MADE IN THE USSR MAY 1983, NOS

6SN7GT, BRIMAR, MATCHED PAIR, CLEAR GLASS, FAT BASE WITH ORANGE PRINT, BRITISH MADE, SAME FACTORY CODE ,1950s PRODUCTION, 6SN7

6SNGT, SYLVANIA, MATCHED PAIR VT-231 CLEAR GLASS, FAT BASE, T PLATE, WARTIME PRODUCTION, 6SN7

6SNGT, RCA, MATCHED PAIR VT-231 GREY GLASS, FAT BASE, SMALL LOGO, SAME DATE CODE, H6E, MAY 1946 PRODUCTION, 6SN7

6SNGT, RCA, MATCHED PAIR VT-231 GREY GLASS, FAT BASE, SMALL LOGO, SAME DATE CODE, H4E, MAY 1944 PRODUCTION, 6N7

6SN7GT, KEN-RAD, MATCHED PAIR, VT-231, GREY GLASS, FAT BASE, BOTTOM GETTER FLASH, Q4 1944 PRODUCTION, 6SN7