page_title: Intermediate-frequency amplifier
hierarchical_section_title: Intermediate-frequency amplifier
caption_attribution_description: The IF stage from a Motorola 19K1 television set. Circa 1949. The actual set can be seen at https://www.flickr.com/photos/jeffjackson/6060060285/
context_page_description: Intermediate-frequency amplifiers are amplifier stages used to raise signal levels in radio and television receivers, at frequencies intermediate to the higher radio-frequency signal from the antenna and the lower audio or video frequency that the receiver is recovering.
context_section_description: Intermediate-frequency (IF) amplifiers are amplifier stages used to raise signal levels in radio and television receivers, at frequencies intermediate to the higher radio-frequency (RF) signal from the antenna and the lower (baseband) audio or video frequency that the receiver is recovering.
caption: The IF stage from a Motorola 19K1 television set circa 1949.
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