having electrostatic control means only

Full Title

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

Child Classifications

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• H01J 21/065
• H01J 21/08 with movable electrode or electrodes
• H01J 21/10 with one or more immovable internal control electrodes, e.g. triode, pentode, octode
• H01J 21/16 with external electrostatic control means and with or without internal control electrodes