A Konka T3498 1 HDTV picture tube 2SC5422 is broken. After replacing the upstream pipe J6920, it will start normally, that is, the pipe will burn out after being heated for 5 minutes.

The power of J6920 is less than 2SC5422. Replace with the original model or 2SC5 144. Since the +B voltage of 145V is normal, the +B current is 2.56A? The line current should be measured at the position of the current limiting resistor of the line power supply, and the normal line current of the machine is 600-700ma.