Difference between Electron Tube and Thermionic Valve

ELECTRON TUBE vs THERMIONIC VALVE: NOUN

Any of several devices consisting of a sealed chamber, either evacuated or filled with gas at low pressure, in which an electric current flows between electrodes.
A sealed enclosure, either highly evacuated or containing a controlled quantity of gas, in which electrons can be made sufficiently mobile to act as the principal carriers of current between at least one pair of electrodes.
Electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

An early electronic device incorporating electrons from a glowing cathode inside an evacuated glass tube; functioned as a switch, amplifier etc.
Electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Inductometer, Electron gun, Electric eye, Electronics, Potential difference, Induction coil, Parametric amplifier, Electric current, Semiconductor device, Electrical device, Thermionic vacuum tube, Thermionic valve, Thermionic tube, Vacuum tube, Tube

Induction coil, Potential difference, Tickler coil, Discharge tube, Electrical circuit, Glow discharge, Semiconductor device, Triode, Electric current, Electrical device, Thermionic vacuum tube, Thermionic tube, Electron tube, Tube, Vacuum tube

Electric circuit, Electrical circuit, Inductometer, Electron gun, Electric eye, Electronics, Potential difference, Induction coil, Parametric amplifier, Electric current, Semiconductor device, Electrical device, Thermionic valve, Vacuum tube, Tube

Diode, Electric circuit, Induction coil, Potential difference, Tickler coil, Discharge tube, Electrical circuit, Glow discharge, Semiconductor device, Triode, Electric current, Electrical device, Electron tube, Tube, Vacuum tube

Here in the multiple world of the electron tube are being born the scientific advances that will make our world immeasurably safer and happier.
The most important advance in radio was the transmission of voice rather than code, something the electron tube, as oscillator and amplifier.
It is the element which corresponds to the control grid of an electron tube.
Microwaves are produced inside the oven by an electron tube called a magnetron.
One of the best is Franks Electron Tube Data Sheets.