{"version":"1.0","type":"link","title":"Hot cathode - Newikis","description":"In vacuum tubes and gas-filled tubes, a hot cathode or thermionic cathode is a cathode electrode which is heated to make it emit electrons due to thermionic emission. This is in contrast to a cold cathode, which does not have a heating element. The heating element is usually an electrical filament…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://upload.wikimedia.org/wikipedia/commons/d/dc/Thermionic_filament.jpg","thumbnail_width":731,"thumbnail_height":682}