.~ With electronic tube or diode in coupling circuit
DEFINITION
Classification: 330/164
(under subclass 157) Subject matter in which the coupling circuit between the two cascaded stages has at least one path which includes an electronic discharge tube (which may be a gas tube or vacuum tube having control means effective during operation of the tube) or which includes a diode element which may be a glow tube, a rectifier vacuum tube diode or a dry rectifier diode, etc..
(1) Note. The electronic tube or diode performs some function, such as an impedance, other than serving as an
additional amplifying device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for control of bias or power supply voltage by a biased rectifier or discharge device.
139, and 140, for an amplifier including an electronic tube or rectifier, respectively, to control the input or gain control electrode bias.
143, where the diode or electronic tube is a thermally responsive element. 145, where the diode or electronic tube is a variable impedance controlled by a separate control path.
185+, for amplifier input circuits including any with an electronic tube or diode, in the input circuit (other than as a preceding amplifying stage).
192+, for amplifier output networks which may include an electronic tube or diode (other than as an amplifying stage).
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks,
213+, for negative resistance and/or reactance networks which have an active element including electron tubes or diodes, as such active elements.
