Addtion Date：2017-08-02 11:32:16 View：
The development history of sound technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect tube.
In 1906, American deforster invented the vacuum triode, which pioneered human electroacoustic technology. Was invented by bell LABS in 1927 after the negative feedback technology, audio technology has entered a new era, more representative such as "Williamson" amplifier, the successful use of the negative feedback technology, make the distortion degree of the amplifier is greatly reduced, and 50 s, the development of the vacuum tube amplifier reached a climax period, all kinds of vacuum tube amplifier emerge in endlessly. Because the electron tube amplifier is sweet and round, it is still preferred by enthusiasts.
The advent of the transistor in the 1960s has led to a wider sound field. The transistor amplifier has the characteristics of delicate timbre, low distortion, wide frequency and dynamic range.
The integrated circuit
In the early 60 s, the United States a new member of the first audio technology, integrated circuits, in the 70 s, the integrated circuit for its high quality and low price, small volume, function etc., gradually by the audio industry. So far, thick film acoustic integrated circuit and operation amplification integrated circuit are widely used in audio circuits.
The field effect tube
In the mid-1970s, Japan produced the first effect power tube. Because the field effect power tube has the characteristics of pure thickness, sweet sound, and the dynamic range of 90dB and THD < 0.01% (100kHz), it is soon popular in the acoustics world. In many of today's amplifiers, field-effect tubes are used as final output.