acorn tube - a small vacuum tube; used at high frequencies

anode - a positively charged electrode by which electrons leave an electrical device

cathode - a negatively charged electrode that is the source of electrons in an electrical device

circuit, electric circuit, electrical circuit - an electrical device that provides a path for electrical current to flow

diode, rectifying tube, rectifying valve - a thermionic tube having two electrodes; used as a rectifier

electrode - a conductor used to make electrical contact with some part of a circuit

electronic device - a device that accomplishes its purpose electronically

electron multiplier - a vacuum tube that amplifies a flow of electrons

gas-discharge tube - a tube in which an electric discharge takes place through a gas

control grid, grid - an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube

klystron - an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation

magnetron - a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators

pentode - a thermionic tube having five electrodes

plate - the positively charged electrode in a vacuum tube

television pickup tube, television-camera tube - a tube that rapidly scans an optical image and converts it into electronic signals

tetrode - a thermionic tube having four electrodes

triode - a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible

X-ray tube - a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays