我台原主机播出改做２００ｋＷＰＳＭ机的备机使用。鉴于备机在平时处于全灯丝电压热备状态，不仅耗电，有损电子管寿命，而且由于机器采用强制风冷，产生极大的室内噪音，影响值班人员对高周信号的监听。为此，我们尝试将其改造为黑灯丝热备，经近一年的试运行，工作状况... My original host broadcast to Taiwan 200kWPSM machine to prepare for use. In view of the preparation machine is usually in the whole filament voltage hot standby state, not only the power consumption, loss of life of the tube, but also because the machine forced air cooling, resulting in a great indoor noise, affecting the duty on the high-frequency signal monitoring. To this end, we try to transform it into a black filament hot backup, after nearly a year of trial operation, working conditions ...