DIFF Subgroup
H03F 3/183 with semiconductor devices only
Introduced: July 1974
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Low-frequency amplifiers, e.g. audio preamplifiers > with semiconductor devices only
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- H03F 3/185 with field-effect devices (H03F3/187 takes precedence) since 1974 +1 CPC IPC+CPC Available in IPC and CPC