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A tuner is an adjustable device which passes one radio frequency, or band of frequencies, and excludes others, by using electrical resonance. The simplest tuner consists of an inductor and capacitor. Combined with a detector, also known as a demodulator, it becomes the simplest radio receiver, often called a crystal set.

Tuners can be either stereo or mono, and are available for TV, FM, and AM signals.

Typically, AM and FM tuners are sold with built-in amplifierAn amplifier is a device which changes a small movement into a larger movement. The relationship of the input to the output--usually expressed as a function of the input frequency--is called the transfer function of the amplifier, and the magnitude of thes and/or loudspeakerA loudspeaker is a device which converts an electrical signal into sound. Dynamic loudspeakers A Dynamic Cone Loudspeaker The traditional design is in two parts, a fibrous semi-rigid cone and attached to the apex of the cone is a coil of fine wire (usualls, and this device is referred to as a receiver. However, standalone stereo FM tuners are sought after for audiophileAn audiophile most generally, is a lover of sound or music, but the word is more commonly used about someone who cares about hi-fi playback of sound recordings, rather than live performances. In some cases, an audiophile desires an improvement in the soun and TV/FM DXTV DX and FM DX are two terms, customarily grouped together, that mean "distant reception" of TV and FM radio stations, respectively. These terms refer to the search for faraway radio or television stations that can be received during unusual tropospheric applications, especially those produced in the 1970s, when standards of quality were higher before plasticThe term plastics covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects or films or fibers. Their name is derived from the fact that in their semi-liquid state they are ma replaced metalFor alternative meanings see metal (disambiguation). In chemistry, a metal is an element that readily forms cations and has metallic bonds, and it is sometimes said that it is similar to a cation in a cloud of electrons. The metals are one of the three gr. A few 1970s tuners feature now-deprecated Dolby noise reduction for FM broadcasts.