ECC32, 6SN7GT, 6SN7, 13D2, B65, CV181, CV1988, 13D2, SMALL SIGNAL, OCTAL

The 6SN7GT double triode valve is electrically equal to a pair of the 6J5 triodes within a single envelope. The construction uses a glass pinch, and the two separate electrode cages are visible through the envelope. The wide glass tube envelope is 27 mm in diameter and excluding the IO base pin length, stands 63 mm high. Type 6SN7GT was first marketed in 1940.

The B65 Marconi-Osram variant with its distinctive metal clad octal base was first marketed in 1948.

The Mullard ECC32 variant is perhaps the first iteration of the type, first marketed in late 1939, as the valve of choice for low noise audio applications. Mullard describe the ECC32 as a double triode with separate cathodes for use as a paraphrase AF amplifier and in phase inverters. The electrode assembly although smaller than other double triodes of the period have supreme rigidity due to the glass pinch mounting mode. The curved anodes do much to increase surface area allowing impressive anode dissipation whilst enhancing rigidity and the sonic purity this can provide.

This Octal triode is favoured for many guitar and classic valve amplifiers, the most renowned being the Leak TL12 0.1 of 1946/7, however, it is surprising which other well regarded and modern exotica also demands fine devices of this type.

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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

Two vacuum tubes with labels on a white background

6SN7GT, KEN-RAD, MATCHED PAIR, VT-231, GREY GLASS, FAT BASE, BOTTOM GETTER FLASH, 1950S PRODUCTION, 6SN7

6SN7GT, Cossor, Made in England, Fat Black Base, Clear Glass, White Print, 1950's Manufacture, 6SN7

6SN7GT, RCA, VT-231 GREY GLASS, FAT BASE, SMALL LOGO, H4E, AUG 1944 PRODUCTION, 6SN7

6SN7GT, BRIMAR, BROWN MICANOL BASE, BLACK GLASS, DECEMBER 1958 OLDWAY MANUFACTURE, ECC32, 6SN7

6SN7GT, VT-231 MILITARY JAN, KEN-RAD, COPPER GRID POSTS 6SN7

ECC34, MULLARD, OLD SHIELD, FACTORY CODE 1322 E1, 1951 PRODUCTION

ECC32, MULLARD, 1135 MXA, JUNE 1945 MITCHAM PRODUCTION

ECC34, MULLARD, OLD SHIELD, FACTORY CODE 1322 E1, 1951 PRODUCTION

CV1988, BRIMAR, MIL SPEC 6SN7GT, BROWN MICANOL BASE, BLACK GLASS, JUNE 1972 OLDWAY MANUFACTURE, ECC32, 6SN7

6SN7GT, SYLVANIA, VT-231, T PLATE, CLEAR GLASS, FAT BASE, WHITE BASE PRINT, JANUARY 1944 PRODUCTION, 6SN7

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

6SN7GT, BRIMAR, FAT BLACK BASE, ORANGE PRINT, FOOTSCRAY MANUFACTURE 6SN7

6SN7GT, SYLVANIA,CHROME DOME, 3 RIB, T PLATE, GREEN PRINT, DECEMBER 1968 PRODUCTION, 6SN7

JAN-CHS-6SN7WGTA, 6SN7W, SYLVANIA, SHORT BOTTLE, GREEN PRINT, USN, OCTOBER 1954 PRODUCTION, 6SN7

JAN-CHS-6SN7WGT, 6SN7W, SYLVANIA, SHORT BOTTLE, GREEN PRINT, USN, SEPTEMBER 1945 PRODUCTION, 6SN7

6SN7GT, Mullard, Made in Holland, Fat Black Base, Clear Glass, r93 L8K, November 1958 Manufacture, 6SN7

6SN7GT, BRIMAR, FAT BLACK BASE, ORANGE BASE PRINT, CLEAR GLASS, FOOTSCRAY OCTOBER 1952 MANUFACTURE, 6SN7

6SN7GT, BRIMAR, FAT BLACK BASE, WHITE BASE PRINT, CLEAR GLASS, FOOTSCRAY OCTOBER 1952 MANUFACTURE, 6SN7

6SN7GT, WESTINGHOUSE, CANADA, JAN, MILITARY,CLEAR GLASS, FAT BLACK BASE, WHITE BASE PRINT, JANUARY 1946 PRODUCTION, 6SN7

CV1988, GEC, HAMMERSMITH, MIL SPEC 6SN7GT, BROWN MICANOL BASE, WHITE CARTOUCHE, JULY 1956 HAMMERSMITH MANUFACTURE, ECC32, 6SN7

6SN7GT, GE CANADA, CLEAR GLASS, FAT BASE, RED BASE PRINT, CANADA 1953 PRODUCTION, 6SN7

6SN7GT, MOTOROLA, CLEAR GLASS, 3 RIB CHARCOAL PLATE, YELLOW BASE PRINT, 6SN7

6SN7GT, RCA, CLEAR GLASS, 3 RIB CHARCOAL PLATE, SMALL LOGO, FEB 1943 PRODUCTION, 6SN7

CV1988, BRIMAR, FOOTSCRAY, MIL SPEC 6SN7GT, BROWN MICANOL BASE, WHITE BASE MARKINGS, FAINT, WITH ENVELOPE ETCHED DATE CODE FOR FOR APRIL 1953, ECC32, 6SN7

6SN7GT, BRIMAR, FAT BLACK BASE, ORANGE PRINT, FOOTSCRAY AUGUST 1954 MANUFACTURE 6SN7

6SN7GTB, GE CANADA MANUFACTURED, MARCONI RADIOTRON, MATCHED PAIR, RED BASE PRINT, 1959 PRODUCTION