Electrical Symbols — Electron Tubes

Invented in 1904 by John Ambrose Fleming, vacuum tubes were a basic component for electronics throughout the first half of the twentieth century, which saw the diffusion of radio, television, radar, sound reinforcement, sound recording and reproduction, large telephone networks, analog and digital computers, and industrial process control. From the mid-1950s solid-state devices such as transistors gradually replaced tubes. However, there are still a few applications for which tubes are preferred to semiconductors; for example, the magnetron used in microwave ovens, and certain high-frequency amplifiers.

Electrical Symbols - Electron Tubes

Pic. 1. Electron Tubes Library

ConceptDraw PRO is a powerful software for creating professional looking electrical diagram quick and easy. For this purpose you can use the Electrical Engineering solution from the "Engineering" area of ConceptDraw Solution Park.

Electrical Engineering Solution for ConceptDraw PRO provides the stencils libraries of ready-to-use predesigned 926 vector symbols, templates and samples that make your electrical drawing quick, easy and effective.

26 libraries of the Electrical Engineering Solution of ConceptDraw PRO make your electrical diagramming simple, efficient, and effective. You can simply and quickly drop the ready-to-use objects from libraries into your document to create the electrical diagram.

Electrical Symbols

Pic. 2. Electrical Engineering symbols

Electrical diagram software will assist you in drawing your electrical diagrams with minimal effort and makes it very easy for beginners. Electrical symbols and smart connectors help present your electrical drawings, electrical schematic, wiring diagrams and blue prints.

Electrical Symbols — Electron Tubes

Pic. 3. Electrical Symbols — Electron Tubes

Most of the electrical symbols can be changed in their appearance, styles and colors according to users' requirements. Electrical symbols are used to represent various electrical and electronic devices in a schematic diagram of an electrical or electronic circuit.

The following table lists some electron tubes electrical symbols in our electrical diagram software.

Symbol Meaning
Electrical Symbols — Electron Tubes
Diode, directly heatedDiode, directly heated
Diode, indirectly heatedDiode, indirectly heated
Diode, envelope, direct. heatedDiode, envelope, direct. heated
Diode, envelope, indirect. heatedDiode, envelope, indirect. heated
Triode, directly heatedTriode, directly heated
Triode, indirectly heatedTriode, indirectly heated
Triode, envelope, direct. heatedTriode, envelope, direct. heated
Triode, envelope, indirect. heatedTriode, envelope, indirect. heated
Tetrode, directly heatedTetrode, directly heated
Tetrode, indirectly heatedTetrode, indirectly heated
Tetrode, envelope, direct. heatedTetrode, envelope, direct. heated
Tetrode, envelope, indirect. heatedTetrode, envelope, indirect. heated
Pentode, directly heatedPentode, directly heated
Pentode, indirectly heated, external connectionPentode, indirectly heated, external connection
Pentode, indirectly heated, internal connectionPentode, indirectly heated, internal connection
Pentode, envelope, direct. heatedPentode, envelope, direct. heated
Pentode, envelope, indirect. heated, external connectionPentode, envelope, indirect. heated, external connection
Pentode, envelope, indirect. heated, internal connectionPentode, envelope, indirect. heated, internal connection
Diode, directly heated 2Diode, directly heated 2
Diode, indirectly heated 2Diode, indirectly heated 2
Diode, envelope, direct. heated 2Diode, envelope, direct. heated 2
Diode, envelope, indirect. heated 2Diode, envelope, indirect. heated 2
Triode, directly heated 2Triode, directly heated 2
Triode, indirectly heated 2Triode, indirectly heated 2
Triode, envelope, direct. heated 2Triode, envelope, direct. heated 2
Triode, envelope, indirect. heated 2Triode, envelope, indirect. heated 2
Tetrode, directly heated 2Tetrode, directly heated 2
Tetrode, indirectly heated 2Tetrode, indirectly heated 2
Tetrode, envelope, direct. heated 2Tetrode, envelope, direct. heated 2
Tetrode, envelope, indirect. heated 2Tetrode, envelope, indirect. heated 2
Pentode, directly heated 2Pentode, directly heated 2
Pentode, indirectly heated, external connection 2Pentode, indirectly heated, external connection 2
Pentode, indirectly heated, internal connection 2Pentode, indirectly heated, internal connection 2
Pentode, envelope, direct. heated 2Pentode, envelope, direct. heated 2
Pentode, envelope, indirect. heated, external connection 2Pentode, envelope, indirect. heated, external connection 2
Pentode, envelope, indirect. heated, internal connection 2Pentode, envelope, indirect. heated, internal connection 2

One classification of vacuum tubes is by the number of active electrodes, (neglecting the filament or heater). A device with two active elements is a diode, usually used for rectification. Devices with three elements are triodes used for amplification and switching. Additional electrodes create tetrodes, pentodes, and so forth, which have multiple additional functions made possible by the additional controllable electrodes.


How to Create an Electrical Diagram Using Electron Tubes Library

  • Open ConceptDraw PRO new document page.
  • Select libraries from Electrical Engineering section.

    Libraries from Electrical Engineering section

  • There are a few different ways to place an object into your drawing:

    • Click on an object and then click on the document, at the place you want the object to be inserted.
    • Perform a drag-and-drop from the library to your document.
    • Double click on an object’s icon in the library to place an object in the center of your document.
  • Select the Smart Connector tool Smart Connector. To connect elements using this tool, drag the connector from one connect dot to another.You can use Layers to place connections on different layers.
  • Result: Electrical Diagram.

    Electrical Circuits Diagram







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