DIFF Subgroup
H03F 3/19 with semiconductor devices only
Introduced: July 1974
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > High-frequency amplifiers, e.g. radio frequency amplifiers > with semiconductor devices only
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- H03F 3/191 Tuned amplifiers (H03F3/193, H03F3/195 take precedence) since 1974 IPC+CPC Available in IPC and CPC
- H03F 3/193 with field-effect devices (H03F3/195 takes precedence) since 1974 +1 CPC IPC+CPC Available in IPC and CPC