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电视机使用一段时期后,显像管会逐渐老化,图像变得暗淡与模糊,明暗对比度差,像是一张保存多年的旧照片。只要对老化的显像管进行适当处理,能使电视图像变得明亮、清晰,显像管还能使用一段时间。我们举国内广泛应用的35cm(14in)黑白显像管35 SX 1B为例,该管额定灯丝电压为12V,额定加速极电压为100V,额定荧光屏电压为12kV。适当提高这三个电压值,会得到良好的效果。下面分别谈谈提高这几个电压值所起的作用和实际操作中的注意事项。1.提高灯丝电压我们知道,加上额定灯丝电压后,具备发射电子功能的阴极表面就能发射出大量的自由电子。显像管老化的原因是阴极中毒,即阴极发射电子能力已经衰退,打到荧光屏上的电子数量变少,屏幕亮度变暗。可将额定灯丝电压从12V提高到13V,让阴极具备
After a period of use of the TV, the picture tube will gradually age, the image becomes dull and fuzzy, and the light and shade contrast is poor, like an old photo that has been preserved for many years. As long as the aging of the picture tube for proper treatment, can make the TV image becomes bright, clear, picture tube can also be used for some time. We take the widely used 35cm (14in) black and white picture tube 35SX 1B as an example, the tube rated filament voltage of 12V, rated accelerating pole voltage of 100V, rated screen voltage of 12kV. Appropriate to raise these three voltage values, will get good results. The following talk about improving the role of these voltage values and the actual operation of the Notes. 1. Increase the Filament Voltage We know that with the rated filament voltage, a large number of free electrons can be emitted from the cathode surface with the electron-emitting function. Cathode aging is due to the cathode poisoning, that is, the cathode emission of electronic capabilities have declined, hit the screen to reduce the number of electrons, the screen brightness dimmer. The rated filament voltage can be increased from 12V to 13V, so that the cathode is available