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

Child Classifications

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• H03F 3/005
• H03F 3/02 with tubes only
• H03F 3/04 with semiconductor devices only
• H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers
• H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
• H03F 3/20 Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence)
• H03F 3/26 Push-pull amplifiers; Phase-splitters therefor (duplicated single-ended push-pull arrangements or phase-splitters therefor H03F3/30)
• H03F 3/30 Single-ended push-pull amplifiers ; Phase-splitters therefor
• H03F 3/34 DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
• 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 (differential sense amplifiers G11C7/062)
• H03F 3/46 Reflex amplifiers
• H03F 3/50 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 (parametric amplifiers H03F7/00; solid state travelling-wave devices H10N70/10)
• H03F 3/60 Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators (H03F3/54 takes precedence)
• 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 3/70 Charge amplifiers
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