Tuner

• 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.
• A device to adjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies.
• A radio receiver without an amplifier or loudspeaker, which is often constructed for superior audio quality in high fidelity applications, as in FM Tuner."
• A professional who adjusts the pitch of musical string instruments such as pianos using a tuning fork, or a frequency counter electronic device using a quartz crystal, as a frequency reference.

• Tuner Information Center