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Class Information
Number: 330/87
Name: Amplifiers > Signal feedback > Cathode impedance feedback
Description: Subject matter wherein the "signal feedback circuit means" or the "shared impedance of the input and output circuits" or a portion thereof is an impedance between the cathode of a vacuum tube amplifying device and ground or other convenient electrical potential reference plane.

Sub-classes under this class:

Class Number Class Name Patents
330/88 Cascade amplifier stages with cathode-cathode feedback 6
330/90 Combined with diverse-type feedback coupling 1
330/94 Frequency responsive means in cathode impedance feedback path 4
330/95 Nonlinear impedance means in cathode impedance feedback path 3

Patents under this class:

Patent Number Title Of Patent Date Issued
7863978 RF amplifier system for neutralizing internal capacitance in a cavity Jan. 4, 2011
3952259 Gain control apparatus Apr. 20, 1976

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