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preamplifier vs. amplifier

preamplifier
[pree-am-pluh-fahy-er] / priˈæm pləˌfaɪ ər /

noun

  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.

amplifier
[am-pluh-fahy-er] / ˈæm pləˌfaɪ ər /

noun

  1. a person or thing that amplifies or enlarges.

  2. an electronic component or circuit for amplifying power, current, or voltage.