.~.~.~ With discharge control means (e.g., grid) {3}
117
.~.~.~.~ D.C. bias control
DEFINITION
Classification: 363/117
D.C. bias control:
(under subclass 116) Subject matter wherein the control of the electronic tube includes varying the magnitude of a direct current or potential applied to the discharge control means.
(1) Note. This subclass includes those systems wherein both an A.C. component and a D.C. component are applied to the control means and those systems wherein only a D.C. is applied to the control means, provided that in each case the actual control of the conductivity of the discharge device is accomplished by varying the magnitude of the D.C. voltage.
SEE OR SEARCH THIS CLASS, SUBCLASS:
116, for the miscellaneous systems having an electronic tube converter with a discharge control means, where the conductivity of the electronic tube is controlled by controlling the time of application of a voltage but not the magnitude of either the D.C. or A.C. applied to the discharge control means. See the reference to subclass 118, below.
118, for the systems under subclass 116 where the phase of the alternating current or potential applied to the discharge control means is shifted with respect to the cathode-anode current to control the electronic tube.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses for miscellaneous systems for supplying current to an electronic tube of the gas or vapor type which has a discharge control means, (e.g., grid, igniter, magnetic field). Many of the systems inherently operate to convert A.C. to D.C. and many of the tubes are referred to as rectifiers, and are therefore closely analogous to the systems in this subclass. 261, 264, and 267 to 275 provide for the systems where the tube is supplied with alternating current and where the tube has a discharge control means which is controlled by controlling the magnitude of the direct current and/or potential is the control circuit. Subclasses 261+ provide for those systems where the discharge control means is an auxiliary starting electrode (e.g., igniter); subclass 267 provides for those systems where the discharge control means is an electromagnetic means; and subclasses 268+ provide for the miscellaneous alternating current supplied discharge control tube systems. Note, indented subclass 270 where both alternating and direct current and/or potential are supplied to the control means. See indented subclass 272 where a rectifier and/or discharge device is connected in the circuit of discharge control means. For the line between Classes 315 and 321, see the class definition, Lines With Other Classes.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, particularly
530+, for miscellaneous electron tube systems which include DC bias control.
