Output circuit of vacuum-tube amplifier

Details Output circuit of vacuum-tube amplifier Output circuit of vacuum-tube amplifier

2008-04-08

2008-04-08

Choe, Henry (Department: 2817)

Amplifiers

Output networks

C330S049000

Reexamination Certificate

active

07355475

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.

REFERENCES:
patent: 3453555 (1969-07-01), Bacon
patent: 4924191 (1990-05-01), Erb et al.
patent: 5422599 (1995-06-01), Larsen
patent: 6737915 (2004-05-01), Harner
patent: 7145392 (2006-12-01), Peavey et al.

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