#amplifier  electronic equipment that increases strength of signals passing through it
  supertype:  #electronic_equipment  equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)
  subtype:  #audio_amplifier  #boosters  #maser
  part of:  #public_address_system__PA_system__PA  an electronic amplification system used as a communication system in public areas
  part of:  #radio_receiver__radioreceiver__receiving_set__receivingset__radio_set__radioset__radio__tuner__wireless  an electronic receiver that detects and demodulates and amplifies transmitted signals
     part of:  #radio__wireless  a communication system based on broadcasting electromagnetic waves
     part of:  #radio-phonograph__radiophonograph__radio-gramophone__radiogramophone  electronic equipment consisting of a combination of a radio receiver and a record player
        part of:  #audio_system__audiosystem__sound_system__soundsystem  a system of electronic equipment for recording or reproducing sound
  part of:  #stereo_system__stereo__stereophonic_system  reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound

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