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DIFF Subgroup
H01J 21/24

with variable amplification factor

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Vacuum tubes > Tubes with more than one discharge path; Multiple tubes, e.g. double diode or triode-hexode > with variable amplification factor

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 more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode > with variable amplification factor

No child classifications to compare. This is a leaf node in both IPC and CPC.