| http://www.w3.org/ns/prov#value | - Another limitation of the vacuum tube rectifier was that the heater power supply often required special arrangements to insulate it from the high voltages of the rectifier circuit.[edit]Solid state[edit]Crystal detectorMain article: cat's-whisker detectorThe cat's-whisker detector, using a crystal such as galena, was the earliest type of solid state diode.[edit]Selenium and copper oxide rectifiers
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