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pre·am·pli·fi·er | \ (ˌ)prē-ˈam-plə-ˌfī(-ə)r 
\
\Definition of preamplifier
: an amplifier designed to amplify extremely weak electrical signals before they are fed to additional amplifier circuits
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Time Traveler for preamplifier
The first known use of preamplifier was in 1934
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