我台一部北广厂生产的CSD－Ⅲ型的1kW单通道彩色电视发射机，本级功放管是FC-732F，当使用一段时间后（在允许小时数）阴流指示表指示由0．8A降到0．7A，直到0．5A，并出现栅流，功率达不到额定值，功率指示灯不亮。在机器运行时当时怀疑为增益下降，管子低效可能不稳定，而加 CSD-Ⅲ 1kW single-channel color TV transmitter produced by our company in Beiguang Factory is of FC-732F. When used for a period of time (in allowable number of hours), the indicator of negative current is indicated by 0. 8A dropped to 0.7A, until 0.5A, and the emergence of grid current, power does not meet the rated value, the power indicator light does not shine. At the time when the machine was running, it was suspected that the gain was declining, and the inefficiency of the pipe might not be stable, thus adding