Amplifier for exerting negative feedback on electronic tube screen grid

A technology of negative feedback and curtain grid, applied in the direction of negative feedback circuit layout, etc., can solve problems such as linearity deterioration and output power reduction, and achieve the effect of improving linearity
CN101272129AInactive Publication Date: 2008-09-24张东静
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
张东静
Publication Date
2008-09-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an amplifier which applies a negative feedback on the plate grid of an electronic tube; after a signal is amplified by a quintode or a beam power tetrode, a part is taken out and then a negative feedback signal is applied to the plate grid of the quintode; the quintode of the amplifier provides a negative feedback AC signal for the plate grid by a coupling capacitance / a Zener diode / a negative feedback servo circuit / a negative feedback winding / a connecting plate grid, a DC voltage for the plate grid is provided by a resistance / the Zener diode / the negative feedback servo circuit / a choke / the negative feedback winding / a connecting plate grid. The scheme can also be suitable for the beam power tetrode. The amplifier of the invention can be used for providing an AC negative feedback signal with a fixed amount for the plate grid, improving the linearity of the quintode or the beam power tetrode and being capable of adjusting the negative feedback amount applied on the plate grid no matter applying the quintode at a voltage amplifying stage or a power amplifying stage; the plate grid and an anode can respectively work at the rated operational voltages of each own when the DC voltage of the plate grid is lower than the anode.
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Description

1. Technical field

[0001] The invention relates to an audio frequency tube amplifier, in particular to an amplifier with negative feedback applied to the screen grid of the tube. 2. Background technology

[0002] Connect the pentode screen grid and the screen electrode with the rated working voltage of the screen grid lower than the rated working voltage of the screen electrode to act as a triode to improve linearity. No matter it is applied in the voltage amplification stage or in the power amplifier stage, it takes a lot of effort. Big price. In the voltage amplification stage, the triode connection reduces the amplification capability of the pentode to the level of the triode; in the power amplifier stage, the triode connection reduces the output power by more than double.

[0003] The super-linear connection method applies a certain amount of negative feedback to the curtain grid, which improves the linearity of the pentode without reducing the output power much. Althou...

Claims

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