IPC Subgroup
H01J 21/1 with one or more immovable internal control electrodes, e.g. triode, pentode, octode
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with a single discharge path > having electrostatic control means only > with one or more immovable internal control electrodes, e.g. triode, pentode, octode
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H01J 21/12 Tubes with variable amplification factor
- H01J 21/14 Tubes with means for concentrating the electron stream, e.g. beam tetrode