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807 (vacuum tube)
The 807 is a beam tetrode vacuum tube, widely used in audio- and radio-frequency power amplifier applications.
==Audio uses==
807s were used in audio power amplifiers, both for public address and hi-fi application, usually being run in push-pull pairs in class AB1 or AB2 giving up to 120 watts of usable power. The plate voltage limit is 750 volts and the screen grid limited to 300 volts. Because of the 300 volt screen grid voltage limit, the 807 cannot be triode connected for high power applications. Failure to observe this precaution will cause screen grid failure. Less commonly a single 807 was used in a pure class-A, single-ended audio output stage delivering about 10 watts.
The 807 is not a good choice of tube for typical Ultra-Linear amplifier circuits, as the maximum screen voltage at 300 V is less than half the maximum plate voltage of 750 V. A possible solution is to use an output transformer with a separate ultralinear screen winding, such as the Acrosound TO-350.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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