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preamplifier vs. amplifier

[ pree-am-pluh-fahy-er ]
  1. a device in the amplifier circuit of a radio or phonograph that increases the strength of a weak signal for detection and further amplification.
[ am-pluh-fahy-er ]
  1. a person or thing that amplifies or enlarges.
  2. an electronic component or circuit for amplifying power, current, or voltage.

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