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Saturday, January 30, 2010

Who invented the Audio Amplifier?

The audio amplifier was invented in 1909 by Lee de Forest when he invented the triode vacuum tube. The triode was three terminal device with a control grid that can modulate the flow of electrons from the filament to the plate. The triode vacuum amplifier was used to make the first AM radio.

Early audio amplifier were based on vacuum tubes which is also known as valves, and some of these achieved notably high quality like the Williamson Amplifier. Most modern audio amplifiers are based on solid state devices (transistors such as BJT, FET, and MOSFET), but there are still some who prefer tube-based amplifier, due to perceive 'warmer' valve sound. Audio amplifier based on transistors became practical with the wide availability of inexpensive transistors in the late 1960s.

  • Williamson amplifier
Posted by Joseph at 8:39 PM

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