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Cathode ray
Videos
Cathode rays are streams of electrons observed in discharge tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed
A beam of cathode rays in a vacuum tube bent into a circle by a magnetic field generated by a Helmholtz coil. Cathode rays are normally invisible; in this demonstration Teltron tube, enough gas has been left in the tube for the gas atoms to luminesce when struck by the fast-moving electrons.
A beam of cathode rays in a vacuum tube bent into a circle by a magnetic field generated by a Helmholtz coil. Cathode rays are normally invisible; in
Crookes tube. The cathode (negative terminal) is on the right. The anode (positive terminal) is in the base of the tube at bottom.
Crookes tube. The cathode (negative terminal) is on the right. The anode (positive terminal) is in the base of the tube at bottom.
Cathode rays travel from the cathode at the rear of the tube, striking the glass front, making it glow green by fluorescence. A metal cross in the tub
Cathode rays travel from the cathode at the rear of the tube, striking the glass front, making it glow green by fluorescence. A metal cross in the tube casts a shadow, demonstrating that the rays travel in straight lines.
A magnet creates a horizontal magnetic field through the neck of the tube, bending the rays up, so the green spot is higher.
A magnet creates a horizontal magnetic field through the neck of the tube, bending the rays up, so the green spot is higher.
Vacuum tube
Videos
A vacuum tube, vac tube, electron tube, thermionic valve, or tube is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been
Cathode ray
…Cathode rays are streams of electrons observed in discharge tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to…
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Operating tubes in an audio power amplifier, the hot cathodes emitting their distinctive red-orange glow
Operating tubes in an audio power amplifier, the hot cathodes emitting their distinctive red-orange glow
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resi
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resistors or inductors) that would be included in series with the C and B voltage sources.
US WWV radio station signal generator using vacuum tubes, 1943
US WWV radio station signal generator using vacuum tubes, 1943