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







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