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6SN7 is a dual triode vacuum tube with an 8-pin octal base. It provided a medium gain (20). Note that ‘6SN7’ is not an actual tube designation〔(【引用サイトリンク】url=http://www.head-fi.org/t/209782/the-6sn7-identification-guide )〕 but indicates a ''family'' of tubes such as 6SN7-GT... the 6SN7 was mostly made in a GT size glass envelope. The 6SN7 is basically two 6J5 triodes in one envelope. ==History== Originally released in 1939 it was officially registered in 1941 by RCA and Sylvania as the glass-cased 6SN7GT, originally listed on page 235 of RCA's 1940 RC-14 Receiving Tube Manual, in the Recently Added section, as: 6SN7-GT. Although the 6S-series tubes are often metal-cased, there was never a ''metal-envelope'' 6SN7 (there being no pin available to connect the metal shield); there were, however, a few glass-envelope tubes with a metal band, such as the 6SN7A developed during World War II - slightly improved in some respects but the metal band was prone to splitting. Numerous variations on the 6SN7 type have been offered over the years, including: * 7N7 (Sylvania 1940, short-lived loktal-base version), * 1633 (RCA 1941, also for 26-V radios), * 12SX7 (RCA 1946, intended for use in 26-volt aircraft electronics), * 5692 (RCA 1948, a super-premium version - not exactly identical - with guaranteed 10,000 hour lifetime), * 6Н8С (Soviet version, circa 1950, sometimes written: 6n8s); * 6SN7 DDR, 6Н8М, E1606 (=CV278), OSW3129 versions with different/larger glass enevelopes; * 6042 (1951, another 1633 type), and * 6180 (1952) * 6SN7W (1956; a more rugged military version, glass enevelope with metal band) American military designator for the 6SN7GA was VT-231, and the British called it CV1988. European designations include the 1942 ECC32 (not an exact equivalent), 13D2 and B65. The 6SN7 has a 6.3 V 600 mA heater/filament. The 12-volt 300 mA filament equivalent is the 12SN7GT or 12SN7GTA. The 14N7 is the Loktal version of the 12SN7GT. There was also a comparatively rare 8V 8SN7 for 450 mA series-string TV sets) and 25 Volt/0.15 Amp heater version: 25SN7GT. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「6SN7」の詳細全文を読む スポンサード リンク
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