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选购显像管时,在没有电视信号(放在电视机空频道位置)时,显像管发光幕面(也称光栅)应明亮,光色均匀。当调节电视机亮度旋钮时,光栅亮度的变化很灵敏,这样才能保证图像明暗对比度强,层次分明,富有艺术感。显像管工作时,尾部电子枪部位不应有红光或蓝光,这是管内真空度低的标志,这种管子电极之间容易打火,图像质量不会高,寿命不会长。如果蓝光不是光柱形状,而是斑斑点点地附着在电子枪的金属零件上或是玻璃管颈的边壁上,这是管内脏物引起的局部气体放电,不是管内真空度差的标
When choosing the picture tube, when there is no TV signal (placed on the empty channel of TV), the picture tube light-emitting surface (also called grating) should be bright and the light color should be uniform. When adjusting the brightness knob of the TV, the grating brightness changes very sensitive, so as to ensure that the contrast of light and dark images, structured, full of artistic sense. CRT work, the tail part of the electron gun should not have red or blue, which is a sign of low vacuum tube, the tube easy ignition between the electrodes, the image will not be high quality, long life expectancy. If the blue light is not a beam shape, but rather speckled on the metal parts of the electron gun or the glass neck wall, which is caused by local gas pipe tube gas discharge, not within the vacuum tube standard