Third-person singular simple present indicative form of preamplify

A voltage amplifier for amplifying a low-level input signal; its output is the input to a higher-level amplifier.

plural of preamplifier

amplified in advance of another operation / amplified by means of a preamplifier

present participle of preamplify

(transitive) To amplify a low-level input signal, producing an output that can serve as the input to a higher-level amplifier.