Amplifier: The amplifier boosts the weak signal from the tuner to a level that can be heard by the listener. It consists of several stages of amplification, each of which increases the signal strength.
Loudspeaker: The loudspeaker converts the electrical signals from the amplifier into sound waves. It consists of a diaphragm that is vibrated by a magnetic coil.
Power supply: The power supply provides the electrical power needed to operate the radio. It consists of a transformer, a rectifier, and a filter capacitor.
Antenna: The antenna receives the radio signals from the air. It consists of a metal rod or wire that is connected to the tuner.