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Output circuit of vacuum-tube amplifier


Title: Output circuit of vacuum-tube amplifier.
Abstract: An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias voltage of a cathode of a vacuum tube is varied in response to an input signal in an output buffer and, when the bias voltage is higher than a voltage set by a bias resistor, signal attenuation by the difference between the bias voltage and the set voltage is generated. To solve these shortcomings, the output circuit of the vacuum-tube amplifier includes a front end amplification unit for amplifying an input signal using a vacuum tube and an output amplification unit for power-amplifying the output signal of the front end amplification unit using a vacuum tube. The output circuit of the vacuum-tube amplifier further includes a zero voltage-maintaining circuit for detecting a voltage of a cathode of the vacuum tube of the front end amplification unit and controlling a voltage applied to a plate of the vacuum tube to maintain the DC voltage of the cathode as 0V, and a variable self-bias circuit for maintaining a bias voltage of a cathode of the vacuum tube of the output amplification unit uniform irrespective of a variation in the input signal. ...




USPTO Applicaton #: #20090224825 - Class: 330 3 (USPTO) - 09/10/09 - Class 330 
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The Patent Description & Claims data below is from USPTO Patent Application 20090224825, Output circuit of vacuum-tube amplifier.




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stats Patent Info
Application #
US 20090224825 A1
Publish Date
09/10/2009
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
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