The development history of audio equipment technology can be divided into five stages: vacuum triodes, electron tubes, transistors, integrated circuits, and field effect tubes.
- Origin – Vacuum triode In 1906, American De Forest invented the vacuum triode, pioneering human electroacoustic technology. In 1927, Bell Labs invented negative feedback technology, which brought the development of audio technology into a new era. The more representative ones, such as the Williamson amplifier, successfully used negative feedback technology to greatly reduce the distortion of the amplifier.
- Electronic tube In the 1950s, the development of tube amplifiers reached a climax, and various tube amplifiers emerged in endlessly. Tube amplifiers are still preferred by audiophiles today because of their sweet and mellow tone.
- Transistor The emergence of transistors in the 1960s brought audio enthusiasts into a broader audio world. Transistor amplifiers have the characteristics of delicate and moving timbre, low distortion, wide frequency response and dynamic range.
- Integrated circuit In the early 1960s, the United States was the first to introduce a new member of audio technology – integrated circuits. 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 power tube In the 1970s, Japan produced the first field-effect power tube. Because field effect power tubes have the characteristics of pure, sweet tone and dynamic range of 90dB and THD<0.01% (at 100kHz), they quickly became popular in the audio industry. Many amplifiers today use field effect transistors as the final output.
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