InventionTriodeLee de Forest, Robert von LiebenSingle-grid amplifying vacuum tube having three active electrodesRead on WikipediaEdit in BackendByLee de Forest, Robert von LiebenMore to readBeyond inventionsSame vibe, elsewhereRelatedMore to readShow all (16)Cathode ray tubeTextTrautoniumTextTraveling-wave tubeTextMagic eye tubeTextBetatronTextShockley diodeTextTricycleTextThereminTextThree-phase electric powerTextTesla coilTextTriangular cupolaTextIconoscopeTextDiode bridgeTextCavity magnetronTextDarlington transistorTextGeiger counterTextAround thisBeyond inventionsShow all (16)🇫🇷Triple secFoodTrio in F sharp minor for violin, cello, and pianoRadioattivitàItalyRadio TrebySwedenTA RADIOSwitzerlandElectrons LibresSwitzerland🇺🇸Tomato juiceFoodLa traviataRTS Couleur 3SwitzerlandRadio IIIIDenmarkRadio ProtoCyprus4RPH Reading RadioAustraliaGLtronGame🇨🇭Technolovers TRAPGermanydertiGreeceElectricity WebGreeceWorld tourSame vibe, elsewhereShow all (16)HR3GermanyEBENEZER STEREOColombiaRadio GermanicaBrazilTurricanGame🇩🇪RADIOGAMMA5ItalyTechnolovers VOCAL TRANCEGermanyDR P2DenmarkTele Radio StereoItalyRadio GameliTogoRadio CoresiRomaniaOxygène RadioFranceTerranova 105PortugalRadio Alfa ViborgDenmarkRetro RadioDenmarkRadio Amica, BiellaItalyBlechradio 1Austria