Intermediate-frequency amplifier

The IF stage from a Motorola 19K1 television set circa 1949.
Discrete transistor 455 kHz IF amplifier.
More modern IF amplifier and demodulator in integrated circuit form

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.

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