.~ With control of input electrode or gain control electrode bias {13}
139
.~.~ Electronic tube controls bias
DEFINITION
Classification: 330/139
(under subclass 129) Subject matter wherein "the bias voltage control means" includes an electronic tube to control the bias voltage which tube may be a gas tube or vacuum tube having a means for control thereof while the tube is in operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9, for amplifiers having periodic switching input-output comparison including those with electronic tubes for control.
11, for amplifiers having D.C.. reinsertion circuits.
85, for amplifiers having amplifiers in the feedback path including bias control for the feedback amplifier.
86, for feedback amplifiers having a variable impedance in the feedback path varied by a separate control means, including those wherein the variable impedance is an electronic tube.
95, and 110, for signal feedback amplifiers with nonlinear impedance which may be an electronic tube. 96, for signal feedback amplifiers wherein the signal amplifier has bias voltage control means, including amplifiers with an electron tube in such bias control means.
114, for amplifiers with oscillators supplying or controlling the bias.
123, for push-pull amplifiers having bias voltage control means including those with electronic tubes, in the bias control means.
134, for amplifiers with plural different bias voltages including electronic tube.
138, for amplifiers controlled by biased rectifiers or discharge devices.
145, for amplifiers having an electronic tube or diode as a variable impedance for the signal channel, controlled by a separate control path.
164, for amplifiers with an electronic tube or diode in the interstage coupling. See the search notes thereunder.
296, for semiconductors amplifiers including those with other transistors for bias control.
SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems, appropriate subclasses, for electronic tubes in voltage magnitude control circuits generally.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, 530+, for miscellaneous electron tube circuits with bias control means.
333, Wave Transmission Lines and Networks,
14, for amplitude compression and expansion systems, subclasses 15 and 16 for pilot signal controlled systems, 17.1+ for automatically controlled systems and 213+ for negative resistance or reactance active element networks.
