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close this bookCircuits, Formulas and Tables Electrical Engineering - Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.)
close this folder1. Selected Graphical Symbols of Electrotechnology
View the document1.1. Graphical Symbols for General Circuit Elements
View the document1.2. Graphical Symbols for Types of Current, Voltage and Connections
View the document1.3. Graphical Symbols for Lines and Line Connections
View the document1.4. Graphical Symbols for Resistors
View the document1.5. Graphical Symbols for Capacitors
View the document1.6. Graphical Symbols for Coils and Transformers
View the document1.7. Graphical Symbols for Current and Voltage Transformers
View the document1.8. Graphical Symbols for Electrochemical and Electrothermal Sources
View the document1.9. Graphical Symbols for Tubes
View the document1.10. Graphical Symbols for Semiconductors
View the document1.11. Graphical Symbols for Switching Devices
View the document1.12. Graphical Symbols for Machines
View the document1.13. Graphical Symbols for Meter Movements and Measuring Instruments
View the document1.14. Graphical Symbols of Electroacoustics
View the document1.15. Graphical Symbols for Wiring Plans

1.9. Graphical Symbols for Tubes

Term

Graphical Symbol


in full

simplified

diode, indirectly heated


duodiode, indirectly heated

or


triode, indirectly heated

or


duotriode with separated cathodes, indirectly heated, heating filament with central tapping, internal screening of the system


tetrode


pentode, suppressor grid connected with cathode


triode - pentode


triode - heptode (according to the circuit, the systems may be drawn left-and-right reversed)