The development history of audio technology can be divided into five stages: vacuum triode, electronic tube, crystal tube, integrated circuit, and field effect tube.

Triode

In 1906, the Americans Deforst invented the vacuum triode and created the precedent of human electro -sound technology. In 1927, Bell Labs invented the negative feedback technology, which entered the development of audio technology into a new era. It was more representative of the Williazon amplifier, which successfully used negative feedback technology, which greatly reduced the distortion of the amplifier.

Electron tube

In the 1950s, the development of electronic tube amplifiers reached a climax period, and various electronic tube amplifiers have emerged endlessly. Because the electronic tube is sweet and rounded, it is still favored by enthusiasts.

Transistor

The emergence of the transistor in the 1960s has entered the vast audio enthusiasts into a wider audio world. The transistor amplifier has the characteristics of delicate and touching tone, lower distortion, wide frequency sounds, and dynamic range.

integrated circuit

In the early 1960s, the United States first launched a new member of the audio technology -integrated circuit. By the early 1970s, integrated circuits were gradually recognized by the audio industry with their quality and low price, small volume, and functional features. Development, thick -membrane audio integrated circuits and computing amplification integrated circuits are widely used in audio circuits.

Field effect

In the 1970s, Japan produced the first field effect power tube. Because the field effect power tube has the characteristics of pure, sweet tone, and the dynamic range of 90DB, THD is less than 0.01%(when 100kHz), it is quickly popular in the audio world. Many amplifiers today use field effect tube as the last output.