Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

Classification Context

Section:

ELECTRICITY

Class:

ELECTRONIC CIRCUITRY

Subclass:

AMPLIFIERS

Child Classifications

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• H03F 3/02 with tubes only
• H03F 3/04 with semiconductor devices only
• H03F 3/18 with semiconductor devices of complementary types
• H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers
• H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
• H03F 3/2 Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
• H03F 3/26 Push-pull amplifiers; Phase-splitters therefor
• H03F 3/3 Single-ended push-pull amplifiers; Phase-splitters therefor
• H03F 3/34 DC amplifiers in which all stages are DC-coupled
• H03F 3/38 DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
• H03F 3/42 Amplifiers with two or more amplifying elements having their DC paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers
• H03F 3/45 Differential amplifiers
• H03F 3/46 Reflex amplifiers
• H03F 3/5 Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
• H03F 3/54 Amplifiers using transit-time effect in tubes or semiconductor devices
• H03F 3/6 Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
• H03F 3/62 Two-way amplifiers
• H03F 3/66 Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
• H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
• H03F 3/7 Charge amplifiers
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