After the power is turned on, the withstand voltage is poor (the test value is low). The heating tube has been broken due to the eccentric heating wire, and it can be repaired after high temperature annealing.
After power- and power-up, the appearance of poor pressure resistance (low test value), due to the heating wire core, resulting in the heating tube has been knocked through, need high temperature after the fire can be repaired
After power on, the poor withstand voltage (low test value) occurred. Due to the core deviation of the heating wire, the heating tube has been broken down, which can be repaired after high temperature annealing<br>