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许多学校、单位的扩音机均是老式的电子管扩音机,这些扩音机安装有低压开关和高压开关,正确的开机顺序应是:先开低压,待灯丝预热5—10分钟后,再开启高压,关机顺序则相反。然而,由于一些单位的管理人员忽视或根本不懂这一操作规程,在灯丝尚未充分预热的情况下开启了高压,甚至胡乱开启,结果造成电子管阴极中毒、电子管过早衰老及整流管损坏。针对
Many schools, the unit’s amplifiers are old tube amplifiers, these amplifiers installed low-voltage switch and high-voltage switch, the correct boot sequence should be: first open the low pressure until the filament warm-up 5-10 minutes, and then open the high-pressure shutdown order The opposite. However, due to the neglect or lack of understanding of this procedure by managers of some units, the high voltage was turned on even when the filament was not sufficiently warmed up, and even the tube was opened in a random manner. As a result, cathode tube poisoning, premature electron tube aging and damage to the rectifier tube were caused. against