Definition and Detection Method of Electron Tube
The definition of electron tube：
An electron tube is a type of current conduction in a hermetic closed container. It utilizes the action of an electric field on the flow of electrons in a vacuum to obtain an electronic device that amplifies or oscillates the signal.
Detection method of electron tube:
1. We can observe the color of the top of the tube. The color of the top of a normal tube is silver or black. If the top has become milky white or light black, the tube is leaking or aging.
2.We can observe whether there is any debris in the tube, gently shake it or use the finger to flick the tube of the tube, and then tilt it upside down to see if there are any debris, white oxide, broken mica and other debris. If there are any debris, It means that the tube is subjected to severe vibration, and the possibility of short circuit between the internal poles is large.
Detect with a Multimeter
1. We can use the multimeter R × 1 file to detect the filament and measure the resistance value of the two filament pins of the tube. The normal value is only a few ohms. If the measured resistance is infinite, the filament of the tube is broken.
2. Detecting whether the tube is aging By measuring the emission capability of the cathode of the tube with a multimeter, it can be judged whether the tube is aging. During the test, the working voltage can be separately provided for the filament of the electron tube, preheated for about 2 minutes, with a multimeter R×100 file, the red test pen is connected to the electron tube, and the black test pen is connected to the grid to measure the resistance between the grid and the cathode. For normal tubes, the resistance between the grid and cathode should be less than 3kΩ. If the resistance between the grid and the cathode is greater than 3 kΩ, the tube is aging. And the larger the resistance value, the more serious the aging of the tube.
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