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A tri-tet oscillator is a crystal-controlled vacuum tube electronic oscillator circuit. It is a type of electron-coupled oscillator (ECO), which uses a tetrode or pentode tube. The tri-tet was introduced by James J. Lamb in the June 1933 issue of QST magazine.〔Lamb, James J. “A More Stable Crystal Oscillator of High Harmonic Output.” QST June 1933: 30-32.〕 In an ECO, The screen grid acts as a plate for the triode oscillator. Some of the electrons pass through the screen grid to the plate, causing a current to flow in the load. This effectively isolates the oscillator portion from the load, so that loading does not affect the operating frequency.〔Sterling, George E. 1940. ''The Radio Manual for Engineers, Inspectors, Students, Operators and Radio Fans.'' 3rd ed. New York: D. Van Nostrand Company, Inc.〕 In the schematic shown, the C1/L1 tank circuit control the current through the crystal. It is normally tuned a point between the crystal's fundamental frequency and its first harmonic. The C2/L2 tank circuit is tuned to the desired harmonic. D+ acts as the "plate" voltage for the tetrode, and is slightly less than B+. ==Tri-Tet in popular culture== Jean Shepherd occasionally mentioned the tri-tet oscillator in his writing and radio shows. It was used as the oscillator in one of the first amateur radio transmitters he used.〔 〕 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「Tri-tet oscillator」の詳細全文を読む スポンサード リンク
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