with one or more immovable internal control electrodes, e.g. triode, pentode, octode

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

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

CPC:

Vacuum tubes (H01J25/00, H01J31/00 - H01J40/00, H01J43/00, H01J47/00, H01J49/00 take precedence; details of vacuum tubes H01J19/00) > Tubes with a single discharge path > having electrostatic control means only > with one or more immovable internal control electrodes, e.g. triode, pentode, octode

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

Navigate with arrow keys, Enter to open

H01J 21/105 CPC only CPC only
H01J 21/12 Tubes with variable amplification factor IPC+CPC Available in IPC and CPC
H01J 21/14 Tubes with means for concentrating the electron stream, e.g. beam tetrode IPC+CPC Available in IPC and CPC