Electron tube
In 1906, American DeForest invented the vacuum triode, creating a precedent for human electroacoustic technology. In 1927, Bell Labs invented the negative feedback technology, which enabled the development of audio technology to enter a new era. Representatives such as Williamson amplifiers successfully used 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 one after another. Due to the sweet and mellow tone of the main technical indicator of the electronic tube, the amplifier is still preferred by enthusiasts.
Transistor
The emergence of transistors in the 1960s enabled the majority of audio enthusiasts to enter a broader audio world. Transistor amplifier has the characteristics of delicate and moving tone, lower distortion, wider frequency response and dynamic range.
integrated circuit
In the early 1960s, the United States first introduced integrated circuits, a new member of audio technology. By the early 1970s, integrated circuits were gradually recognized by the audio industry for their high quality, low price, small size, and multiple functions. . Since its development, thick film audio integrated circuits and operational amplifier integrated circuits have been widely used in audio circuits.
Field effect tube
In the mid-1970s, Japan produced the first field-effect power tube. Because the field-effect audio power tube also has the characteristics of the pure thick, sweet tone of the tube, the dynamic range of 90dB, and the THD<0.01% (at 100kHz), it will soon become popular in the audio industry. Many amplifiers today use FETs as the final output.
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