History
The heyday for grid-leak detectors was the 1920s, when battery-operated, multi-dial tuned radio frequency receivers using low-mu triodes with directly heated cathodes were the norm. The Zenith Models 11, 12, and 14 are examples of these kinds of radios. When indirectly heated cathodes and AC powered receivers were introduced in 1927, most manufacturers switched to plate detectors, and later to diode detectors.
Although the regenerative grid-leak detector was one of the more sensitive detectors of its day, its ability to radiate radio frequency energy when improperly adjusted limited its use in urban settings where multiple receivers would be operated in close proximity. The RCA Radiola III and IIIa and the Crosley Model 51 are examples of regenerative receivers from this period.
Read more about this topic: Grid-leak Detector
Famous quotes containing the word history:
“One classic American landscape haunts all of American literature. It is a picture of Eden, perceived at the instant of history when corruption has just begun to set in. The serpent has shown his scaly head in the undergrowth. The apple gleams on the tree. The old drama of the Fall is ready to start all over again.”
—Jonathan Raban (b. 1942)
“The history of any nation follows an undulatory course. In the trough of the wave we find more or less complete anarchy; but the crest is not more or less complete Utopia, but only, at best, a tolerably humane, partially free and fairly just society that invariably carries within itself the seeds of its own decadence.”
—Aldous Huxley (1894–1963)
“America is the only nation in history which miraculously has gone directly from barbarism to degeneration without the usual interval of civilization.”
—Georges Clemenceau (1841–1929)