Good morning "technician 15" The problem is that you are disabling X-ray protection. I do not know if you know that TRC tubes can under certain circumstances, when over-excited, emit hard-type X-rays, which can harm people who watch TV. It can even boost cancer lesions. You should check the power supply tensions; The voltages of 112V and 12V are essential and precise, it is the sum of these two currents that correctly adjust the voltage of the B + to the 112V flyback, through the IC803, using the opto IC802 coupler as transport, sometimes dry filters in the source stages, reduce the necessary dc response at the source output. Therefore, what are the source tensions and vertical tension? Luck!