Electronic amplifier
electronic circuit or component that increases the level of incoming electrical signal (not necessarily audio)
differential amplifier
Instrument amplifier
low-noise amplifier
traveling-wave tube
Class-D amplifier
amplifier stage
guitar amplifier
power amplifier
Keyboard amplifier
operational amplifier
line driver
variable-gain amplifier
Programmable-gain amplifier
current-to-voltage converter
Isolation amplifier
instrument amplifier
Intermediate-Frequency (IF) amplifier
Lin amplifier
antenna amplifier
Distribution amplifier
Doherty amplifier
Fully differential amplifier
Intermediate power amplifier
Linear amplifier
valve amplifier
booster
buffer amplifier