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CPC Subgroup
H01J 21/20

Tubes with more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode

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 more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode

3 direct subcodes

Child Classifications

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  • H01J 21/22 with movable electrode or electrodes
  • H01J 21/24 with variable amplification factor
  • H01J 21/26 with means for concentrating the electron stream