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引言在我们研制石墨栅的过程中发现,石墨栅电子管的耐压性能明显地较钼栅管差,尤其是四极管的一、二栅之间,常常在达不到所要求的工作电压时,就发生跳火击穿,使管子不能正常工作,甚至造成永久性损坏。以我厂79年试制的FU-108z电子管为例。排气中高压烧毛时,钼栅管g_1~g_2能耐8kV高压冲击,g_2~A可打到60kV以上。石墨栅管g_1~g_2勉强打到3kV(此时的平均场强E=
Introduction We found in the process of graphite grid, graphite gate tube voltage performance significantly worse than the molybdenum grid, especially between the first and second quadruplets, often fail to reach the required operating voltage , There will be flash fire breakdown, so that the pipe can not work, and even cause permanent damage. Take the trial production of FU-108z tube in our factory for 79 years as an example. Exhaust in the high-pressure singeing, molybdenum gate g_1 ~ g_2 can withstand high-voltage impact of 8kV, g_2 ~ A can hit 60kV above. Graphite grid g_1 ~ g_2 barely hit 3kV (at this time the average field strength E =