Vacuum tube symbols

Electron tube in which is practiced a high enough pressure so that its electrical properties are not substantially modified by the ionization of residual gas or vapor.
Also known as vacuum tubes and thermionic valves.

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Symbols of transistors MOSFET and IGFET

Transistors of field effect (MOSFET and IGFET) are transistors constituted by a filament generally of silicon semiconductor, so called channel, and an associate diode called door. 
These symbols can be represented inside a circle.

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