Grid-leak detector
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A grid leak detector is an electronic circuit that demodulates an amplitude modulated alternating current and amplifies the recovered modulating voltage. The circuit utilizes the non-linear cathode to
A grid leak resistor and capacitor unit from 1926. The 2 megohm cartridge resistor is replaceable so the user can try different values. The parallel capacitor is built into the holder.
A TRF receiver using a grid leak detector (V1)
Single triode receiver 1924
Detector (radio)
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In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio. Unlike modern radio sta
Grid-leak detector
…to control grid conduction characteristic and the amplification factor of a vacuum tube. Invented by Lee De Forest around 1912, it was used as the detector (demodulator) in the first vacuum tube radio receivers until the 1930s. Early applications of triode tubes (Audions) as detectors usually did not include…
A coherer detector, useful only for Morse code signals.