CPC Subgroup
H03F 3/34 DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
2 direct subcodes
Child Classifications
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- H03F 3/343 with semiconductor devices only
- H03F 3/36 with tubes only