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.
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Electrical Diagram Symbols F.A.Q.
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. 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.
