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The 2N107 is an early germanium alloy junction PNP transistor developed by General Electric (GE) in 1955, to become GE's entry into the electronic hobbyist market successfully started with the CK722 transistor. Like the CK722, it enjoyed a long standing popularity. General Electric decided to designate it with a JEDEC 2N- series identification.〔 This is unusual for a hobby device. Soon after, other manufacturers got involved in the hobby business like Sylvania, Tung-Sol and RCA. == History== A detailed story of the 2N107 conception can be heard with Jack Ward interviewing Carl Todd at the Semiconductor Museum website which much of this History section is based on. The 2N107 was conceived in 1955 by Carl David Todd, who had just joined GE as an engineer. Todd's interest in a hobby/experimental transistor probably originated when he participated in one of the CK722 transistor design contests, while he was an engineering student at Auburn University and finished sixth. The success of the CK722 gave impetus for Carl Todd to convince GE marketing to follow the path of Raytheon, the inventor of the CK722. General Electric had a lot of 2N43 thru 2N45 type transistors that did not meet specifications. Like Norman Krim at Raytheon, Carl Todd wanted to increase GE's transistor market by expanding into the hobbyist market. Like Raytheon's CK722, the GE 2N107 were fallouts or rejects of GE's successful 2N43, 2N44 and 2N45 alloy junction transistors. Unlike early Raytheon transistors, which were sealed in a resin material, GE devices were housed in metal hermetically-sealed enclosures, removing oxygen and other potential contaminants to ensure reliability and long life, since many of the 2N43-45 transistors were used in military applications. Unlike most transistors sold in the 1950s that cost $10 or more, the 2N107's initial price was under $2.00; still a lot of money for the experimenter in the 1950s, but within reach. The 2N107 enjoyed a very long product life, starting in 1955, and continuing into the 1970s. It outlasted Raytheon's CK722. In the 1960s, ETCO became a secondary manufacturer (second source) of the transistor, but in the standard TO-5 case instead of the "top hat." In the 1980s, the transistor was discontinued by GE, but unmarked versions in the TO-5 case were sold in multiples by Radio Shack in their Archer Paks™, as well as at other electronic outlets such as Poly Paks and Olson Electronics. General Electric pioneered the alloy junction transistor process for germanium transistors. Bell Labs, the inventor of the transistor, also had a similar process (called the rate-grown junction process), but many manufacturers preferred GE's process because it fit better for mass production and resulted in higher yields. The 2N43-45 series was GE's first commercial alloy junction transistor using the 2N numbering system. 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「2N107」の詳細全文を読む スポンサード リンク
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