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.
Pic. 1. Electron Tubes Library
ConceptDraw DIAGRAM 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 DIAGRAM 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 DIAGRAM 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.
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.

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 heated | |
![]() | Diode, indirectly heated | |
![]() | Diode, envelope, direct. heated | |
![]() | Diode, envelope, indirect. heated | |
![]() | Triode, directly heated | |
![]() | Triode, indirectly heated | |
![]() | Triode, envelope, direct. heated | |
![]() | Triode, envelope, indirect. heated | |
![]() | Tetrode, directly heated | |
![]() | Tetrode, indirectly heated | |
![]() | Tetrode, envelope, direct. heated | |
![]() | Tetrode, envelope, indirect. heated | |
![]() | Pentode, directly heated | |
![]() | Pentode, indirectly heated, external connection | |
![]() | Pentode, indirectly heated, internal connection | |
![]() | Pentode, envelope, direct. heated | |
![]() | Pentode, envelope, indirect. heated, external connection | |
![]() | Pentode, envelope, indirect. heated, internal connection | |
![]() | Diode, directly heated 2 | |
![]() | Diode, indirectly heated 2 | |
![]() | Diode, envelope, direct. heated 2 | |
![]() | Diode, envelope, indirect. heated 2 | |
![]() | Triode, directly heated 2 | |
![]() | Triode, indirectly heated 2 | |
![]() | Triode, envelope, direct. heated 2 | |
![]() | Triode, envelope, indirect. heated 2 | |
![]() | Tetrode, directly heated 2 | |
![]() | Tetrode, indirectly heated 2 | |
![]() | Tetrode, envelope, direct. heated 2 | |
![]() | Tetrode, envelope, indirect. heated 2 | |
![]() | Pentode, directly heated 2 | |
![]() | Pentode, indirectly heated, external connection 2 | |
![]() | Pentode, indirectly heated, internal connection 2 | |
![]() | Pentode, envelope, direct. heated 2 | |
![]() | Pentode, envelope, indirect. heated, external connection 2 | |
![]() | Pentode, 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 DIAGRAM new document page.
- Select 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
. 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.
TEN RELATED HOW TO's:
Electrical Symbols — Analog and Digital Logic →
Digital electronics or digital (electronic) circuits are electronics that handle digital signals – discrete bands of analog levels – rather than by continuous ranges (as used in analogue electronics). All levels within a band of values represent the same numeric value. Because of this discretization, relatively small changes to the analog signal levels due to manufacturing tolerance, signal attenuation or parasitic noise do not leave the discrete envelope, and as a result are ignored by signal state sensing circuitry. 26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM 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.
Circuits and Logic Diagram Software →
A circuit diagram is sometimes also called an elementary diagram, electronic schematic or electrical diagram circuits. It is essential in construction of any electronic equipment. Among many digital drawing tools available, ConceptDraw DIAGRAM is a leading circuits and logic diagram software, affording for easy and quick creation of even the most advanced and complex diagram designs. This makes it a perfect choice for computer science and any kind of electronic engineering. This drawing includes the graphic symbols that may be in use while creating a logic circuit diagram. The diagrams of such kind are used in the electronics industry. The logic symbol depicts a device that realizes a Boolean type functions. Practically a logic symbol means transistor, diodes, relays, and other mechanical or optical details which provide function of closing or opening "gates". Totally the logic circuits can involve millions of gates. ConceptDraw Electrical Engineering solution gives the opportunity to create a circuit diagrams both simple and difficult.
Home Electrical Plan →
Planning and construction of any building begins from the designing its floor plan and a set of electrical, telecom, piping, ceiling plans, etc. Solutions of Building Plans Area of ConceptDraw Solution Park can effectively help you develop all these plans. Let's design the Home Electrical Plan in ConceptDraw DIAGRAM quick and easy.
Electrical Symbols — Lamps, Acoustics, Readouts →
Wiring and circuit diagrams use special symbols recognized by everyone who uses the drawings. The symbols on the drawings show how components like resistors, capacitors, inductors, switches, lamps, acoustic devices, measuring devices and other electrical and electronic components are connected together. 26 libraries of the Electrical Engineering Solution of ConceptDraw DIAGRAM 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.
Notation & Symbols for ERD →
The ER diagram is constructed from the specific ERD graphic elements. There are used 2 types of ERD notations: Chen and Crow's Foot. A complete set of work flow shapes, notation & symbols for ERD, entity relationship stencils, included in Entity-Relationship Diagram (ERD) solution for ConceptDraw DIAGRAM software, makes drawing diagrams based on ERD notation as smooth as possible.
How to draw Metro Map style infographics? (London) →
Tool to draw Metro Map styled inforgraphics. London Tube map sample.
Electrical Diagram →
Electrical Diagram is a visual graphical representation of an electrical circuit. ConceptDraw DIAGRAM diagramming and vector drawing software supplied with unique Electrical Engineering Solution from the Industrial Engineering Area will help you design Electrical Diagram of any complexity without efforts.
Local area network (LAN). Computer and Network Examples →
Computer networks nowadays are spread all across the world. The large number of parameters, such as geographic scale or communication protocols, can divide networks. One of the most common types of networks is called local area network (LAN). It convenient to represent network examples by means of diagrams. This local area network (LAN) diagram provides an easy way to see the way the devices in a local network are interacted. The diagram uses a library containing specific symbols to represent network equipment , media and the end-user devices such as computers (PC, mac, laptop) , network printer, hubs, server and finally a modem. There are two types of network topologies: physical and logical. The current diagram represents precisely a physical type of LAN topology because it refers to the physical layout of a local network equipment.
Audio Connectors →
Audio connectors are electrical connectors designed and used for audio frequencies. ConceptDraw DIAGRAM diagramming and vector drawing software extended with Audio and Video Connectors Solution from the Industrial Engineering Area is the best for drawing various audio schematics with detailed illustration the audio connectors.