UHF tuners — Present status and future trends

The present day UHF tuner generally consists of a vacuum tube oscillator, 1N82A silicon diode mixer, and double tuned r-f preselector. Historical developments leading to the present design are discussed, including alternate oscillator and preselector designs. New tubes and transistors, available as UHF oscillators, are covered. Two new UHF tuners using transistor oscillators are presented. European UHF tuner designs using r-f amplifier and self-oscillating mixer are described and compared to U.S. types.