aopen all american five alternating current aluminium aluminium oxide amplifier anode argon artillery audion tube audiophile automatic gain control barium barium oxide battery eliminator batteryless radio beam tetrode black body bluetooth british valve association calcium oxide cathode bias cathode ray tube ceramic cold cathode colossus computer compactron computer control grid convection crookes tube cunife demodulation diffusion diode direct current display device double diode triode dry cell eniac eimac electric guitar electrical filament electricity electrode electrolytic capacitor electromagnetic pulse electron electronics eric tigerstedt eugen goldstein fernico field emission flat panel display fleming valve frederick guthrie free-fall free electron laser gas geissler tube general electric getter glass-to-metal seal glowing plate grid bias grid leak gyrotron heater helium high-end audio hot cathode incandescent light bulb induction heating inert gas inorganic nanotube instrument amplifier integrated amplifier integrated circuit ion ionization irving langmuir johann wilhelm hittorf john ambrose fleming jukebox klystron lead-acid battery lee de forest library of congress classification list of vacuum tube computers list of vacuum tubes mains electricity marconi company microwave microwave oven military miller effect mobile phone mullard-philips tube designation nec neon neutrodyne nickel nikola tesla nixie tube nuclear explosion nuvistor online computer library center oscilloscope oxygen pa particle accelerator pentagrid converter pentode phosphor photomultiplier plate electrode pneumatic tube power supply preamplifier process control proximity fuze rca retma tube designation rma tube designation radar radio radio frequency rectifier relay resistor robert von lieben satellite screen grid secondary emission semi automatic ground environment silicate silicon sound film space charge spindt tip strontium oxide submarine communications cable suppressor grid switch telephone television tetrode thermionic emission thermistor thomas edison thorium thyratron tommy flowers transconductance transformer transistor traveling-wave tube triode tube socket tube sound tungsten uptime vacuum vacuum fluorescent display valve amplifier videocassette recorder voltage divider voltage regulator wi-fi wikimedia commons wire world war ii x-ray tube zinc zirconium