七十年代后期,为获得功率发射管的寿命数据,人们曾开展过较大规模的调研活动,遍及12个省市、35个电台和广播局,以随机抽样的方法对二十余种管型的寿命及失效因素作了统计,其结果示于表1。它基本上揭示了七十年代我国发射管的寿命状况和水平。作比较后发现,大中型玻璃管的平均寿命 In the late seventies, in order to obtain the life data of power launch tubes, people conducted large-scale research activities in over 12 provinces and cities, 35 radio stations and broadcasting stations in a random sample of more than 20 tubes The life expectancy and failure factors were calculated, the results are shown in Table 1. It basically reveals the life condition and level of China's launch tube in the seventies. For comparison found that the average life expectancy of large and medium-sized glass