Electronic tube

 

In 1906, American DeForrest invented the vacuum triode, which pioneered the human electroacoustic technology. In 1927, Bell Labs invented the negative feedback technology, which made the development of sound technology enter a new era. More representative, such as Williamson amplifier, successfully used the negative feedback technology to greatly reduce the distortion of the amplifier. In the 1950s, the development of tube amplifiers reached a climax, and various tube amplifiers emerged in an endless stream. Because the main technical indicators of the tube are sweet and mellow, they are still preferred by enthusiasts.

 

Transistor

 

The emergence of transistors in the 1960s has enabled the majority of audio enthusiasts to enter a broader sound world. Transistor amplifiers feature exquisite and impressive sound, low distortion, wide frequency response and dynamic range.

 

integrated circuit

 

In the early 1960s, the United States first introduced a new member of the audio technology, the integrated circuit. In the early 1970s, integrated circuits were gradually recognized by the audio industry for their high quality, low price, small size, and many functions. . Up to now, thick film audio integrated circuits and operational amplifier integrated circuits have been widely used in audio circuits.

 

Field effect transistor

 

In the mid-1970s, Japan produced the first field effect power tube. Because the field effect audio power tube has the characteristics of pure tube thickness, sweet tone and dynamic range of 90dB and THD<0.01% (100kHz), it is very popular in the audio industry. Many of today's amplifiers use FETs as the final stage output.