DIFF Subgroup
H03F 3/22 with tubes only (H03F3/24 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: with tubes only
CPC: with tubes only (H03F3/24 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Power amplifiers, e.g. Class B amplifiers, Class C amplifiers > with tubes only
CPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) > with tubes only (H03F3/24 takes precedence)
No child classifications to compare. This is a leaf node in both IPC and CPC.