an amplifier designed to increase the power of an electrical signal to the level required to drive a device or circuit, esp. a speaker.

(see quot. 1938).

An amplifier designed to amplify a very weak signal (as from a microphone, pickup, etc.) and deliver it to another amplifier for further…

An amplifier, esp. for an electric guitar.

= power amplifier n.

Of or pertaining to logarithms. Also in logarithmic sine, tangent, secant, etc., used (somewhat incorrectly) to denote the logarithm of the…

= preamplifier, n.

An amplifier unit (esp. one used to amplify an electric guitar) which does not contain a speaker, and is connected to one or more separate speaker…