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一种防止分米波发射管早期失效的保护装置于1990年1月8日在唐山电视台通过技术鉴定。分米波10kW电视发射机的末级大功率管RS 1034SK,是由西门子公司生产的,每只售价6万元人民币。由于该管灯丝电阻冷热差10倍,阴栅距离仅0.3mm,因此在开关机灯丝大电流冲击下早期失效严重,给使用单位造成了相当大的经济损失。
A protection device for preventing the early failure of the decimeter emitting tube passed the technical appraisal on January 8, 1990 in Tangshan television station. The final stage high power tube RS 1034SK for the decimeter 10kW TV transmitter was produced by Siemens with a price of 60,000RMB each. As the filament resistance of the tube 10 times cold and heat, the distance between the cathode grid is only 0.3mm, so the switch in the early under the impact of large current filament failure, causing significant economic losses to the use of units.