彩电使用日久发生跑台现象,究其原因是中频回路失谐所致。彩色电视机延用国外设计惯例,图像检波和 AFT 谐振回路都采用内附谐振电容的 LC 回路,该电容系管状陶瓷电容,作为电容器电极的银层极薄,由于生活中煤、煤气燃烧时总有少量二氧化硫产生,与 The use of color television sets ran the phenomenon of running time, the reason is due to the detuning of the IF circuit. Color television set aside the use of foreign design practices, image detection and AFT resonant circuit are used with LC circuit resonant capacitance, the capacitance of tubular ceramic capacitors, as the capacitor electrode silver layer is extremely thin, due to the life of coal, when the total gas combustion A small amount of sulfur dioxide generated, and