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SY4307A
The type SY4307A is a power output pentode possessing a similar power rating, but significantly different characteristics to the far more common type 807 thermionic valve/vacuum tube. ==Uses==
Although the 807 is used for both audio amplification, (usually class AB, and radio frequency amplification in the 1-30 MHz range, (usually class C), this type was usually used for the latter.
This tube/valve is a pentode with a 'directly heated cathode', meaning that the cathode consists of an emissive oxide coated filament. These features suggest the SY4307A could predate and is contemporary with, the 807 which is a beam power tetrode, a more advanced design with a more linear transfer characteristic and a more complex 'indirectly heated cathode'.
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「SY4307A」の詳細全文を読む
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