2.行推动变压器初级短路法若行输出管集电极电压明显低于正常值(+B),就可通过短路行推动变压器初级绕组来判断行输出级绕组在直流短路还是交流短路。这是因为短路后行管基极无激励脉冲输入而行管不工作。因此,如果短路后行管集电极电压恢复正常,便说明行输出级存在着 2 line to promote the transformer primary short circuit method If the output tube collector voltage is significantly lower than the normal value (+ B), you can push the primary winding of the transformer short circuit to determine the line output winding in the DC short circuit or AC short circuit. This is because after the short circuit, the base of the tube has no excitation pulse input and the tube does not work. Therefore, if the tube collector voltage returns to normal after a short circuit, it indicates that there is a row output stage