延长分米波电视发射管使用寿命的探讨（上）

To Elongate the Lifetime of UHF TV Transmitting Tubes

文章从原理上讨论了影响分米波电视发射管寿命的若干因素。并提出了若干延长寿命的建议：（１）正确的灯丝加热方法是行之有效的措施，经验证明：过分强调降低灯丝电压往往得到相反的效果。（２）必须有良好的冷却方式。（３）通过对帘栅电路的分析，说明对此电路必须作很好的处理以消除故障和防止寄生振荡。

In this paper some factors influensing the lifetime of UHF TV transmitting tubes are theoretically discussed. Based on these discussions,several recommondations to elongate the lifetime of such tubes are given:(1) Correct method to heating the filament is an efficient measure.And it is proved that if the filament voltage is too low during operation, the lifetime may be shortened.(2) Optimum cooling of the tube is necessary.(3) An analysis of screen grid circuit shows that it must be carefully treated to avoid troubles and parasitic oscillations.