CPC Subgroup
H03F 3/191 Tuned amplifiers (H03F3/193, H03F3/195 take precedence)
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 > Tuned amplifiers (H03F3/193, H03F3/195 take precedence)