CPC Subgroup
H03F 3/183 with semiconductor devices only
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
2 direct subcodes
Child Classifications
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- H03F 3/185 with field-effect devices (H03F3/187 takes precedence)
- H03F 3/187 in integrated circuits