Ficheiro:Diode-tube.pngAn illustration of a vacuum tube diode. Detail of illustration from U.S. patent number 803684, issued November 7, 1905 to John Ambrose Fleming (1849-1945)
Ficheiro:Vacuum diode.png Вакуумен диод. Собствена графика. Vacuum tube diode symbol. Own work. I, the copyright holder of this work, hereby publish it under the following license:
Ficheiro:Diode vacuum tube.svgDescriptionDiode vacuum tube.svg English: cutaway drawing of a vacuum tube diode Date 22 July 2010 Source own work, based on Diode vacuum tube.png Author