.~> With control of input electrode or gain control electrode bias {13}
DEFINITION
Classification: 330/127
(under the class definition) Subject matter combined with means to control the voltage of the source of electrical energy which is supplied to the amplifying device, or combined with means to control a bias voltage applied to an electrode, such control means, generally, being applied to stabilize the power supply or bias voltage or to alter the operation of the amplifying device in a predetermined manner as, for example, to control the signal amplitude, or means to regulate the power, heater, or filament supply of the amplifying device.
(1) Note. Limiters of the active element type which "clip" the signal are not classified herein. Limiters combined with amplifiers where the bias of an electrode of the amplifier is controlled to "accommodate" a given maximum signal (where there is no clipping of the signal) are classified herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9, for amplifiers with periodic switching input-output comparison.
11, for amplifiers having D.C.. reinsertion circuits.
51, for amplifiers combined with automatic disabling switch means.
52, for amplifiers having pilot frequency control means. 59, for amplifiers having light control or activated means.
70+, for series energized vacuum tube amplifiers.
85, for signal feedback amplifiers having an amplifier in the feedback path including the control of bias of such feedback amplifiers.
86, for signal feedback amplifiers having a separately controlled variable impedance in the feedback path.
96, for signal feedback amplifiers having bias voltage control of the signal amplifier.
113, for polyphase power supply.
114+, for unrectified A.C. power supply for an electrode.
123, for control of bias voltage or power supply voltage in push-pull amplifiers.
143, for amplifiers having a thermally responsive impedance.
144+, for amplifiers having a variable impedance for the signal path varied by a separate control path.
164, for cascaded amplifiers having an electronic tube or diode in the interstage coupling. 174, for cascaded amplifiers having an electro-mechanical transducer (e.g., piezoelectric crystal in the interstage coupling path.
179, and 180, for cascaded amplifiers having an inductance in the anode or grid circuit, or a resistance in the anode and grid circuit in the capacitance-coupled interstage coupling, respectively.
183, for cascaded amplifiers having a nonlinear device in the D.C.. interstage coupling path.
199+, for amplifiers with significant power or bias voltage supply.
254, and 278+, for semiconductor amplifiers having signal amplitude (volume level) control including such means where the bias is controlled.
290, for semiconductor amplifiers having D.C.. feedback bias control for stabilization.
297, for series energized cascaded semiconductor amplifiers.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
31+, and 52+ for current or voltage control of electrical transmission or interconnection systems.
323, Electricity: Power Supply or Regulation Systems, for limiters of the active element type which "clip" the signal; see appropriate subclasses for voltage magnitude control systems generally.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, 309+, for amplitude limiting means.
329, Demodulators, appropriate subclasses for automatic control of the bias of a demodulating element.
333, Wave Transmission Lines and Networks, particularly
2+, for automatic control of plural channel passive networks, subclass 14 for compressors and expanders, subclasses 15 and 16 for pilot signal controlled systems, subclasses 17.1+ for automatically controlled lines or networks, and subclass 81 for attenuators. See also the search Notes under these subclasses.
338, Electrical Resistors, for the structure of resistors, rheostats, and potentiometers, per se.
455, Telecommunications,
234.1+, for automatic volume control in radio receivers; and subclass 343 for particular power or bias supply for radio receivers.
