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功能: 为了提高电子管特别是发射电子管的寿命,对控制电路作了如下改进:(1) 把备份机在作备份时的灯丝电压全压预热改为半压预热;(2) 把灯丝电压一挡上到二挡上
Function: In order to improve the life of the tube, especially the launch tube, the control circuit has been improved as follows: (1) The backup machine for the backup voltage of the entire filament preheat to half-pressure preheat; (2) the filament voltage A block on the second block