一种高传真推挽扩音机的设计

Design of High Fidelity Push-pull Electron Tube Amplifier

针对电子管扩音机频率响应较窄、失真度较大等问题,采用在功率放大级施加帘栅极负反馈与向整机施加反馈深度较浅的大环路负反馈的电路的方法,设计了一种高传真推挽扩音机。该设计使功率放大级在略微牺牲一些增益的条件下获得比标准连接时低得多的内阻。测试结果表明,该设计明显改善了功率放大管原来的非线性特征,显著减小了失真度。

In order to solve the problems that traditional electron tube amplifier frequency response is narrow, the distortion is large, a hi-fi push-pull amplifier was designed. The amplifier adopts and uses power amplifier stage applied screen grid of negative feedback, applying circuit feedback loop shallow depth of the negative feedback to the machine. The power amplifier stage when it is at a slight sacrifice some gain, can obtain standard conditions resistance and when the connection is much lower, thus significantly improves the power amplifier nonlinear characteristics of the original, significantly reduces the degree of distortion.