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Class Information
Number: 330/142
Name: Amplifiers > With control of power supply or bias voltage > With control of input electrode or gain control electrode bias > Cathode resistor supplies bias (e.g., self-biasing circuits)
Description: Subject matter involving a vacuum tube amplifying device whose input electrode bias voltage and/or bias control voltage for the same amplifying device is supplied from a resistive circuit network in the cathode to ground path of the vacuum tube amplifying device whereby the plate current flowing through such resistor, which is usually by-passed for signal current frequencies, develops a D.C. bias voltage at the cathode.

Patents under this class:

Patent Number Title Of Patent Date Issued
7511573 Input/output signals preserver circuit of amplification circuits Mar. 31, 2009

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