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looks like the CRT is weak consider the age(hours).it may also be a cold solder. if it is the crt, try to bring the screen level up at FB transformer, and also try to slightly increase the heater voltage of the CRT.Also,Cheat the IK blank signal by reduce the IK blank singal path resistor or diode may help.these is very technicial job and do not try it yourself,leave it to expert technican(not fresh technician job).
Hello and thank you very much for your reply I will try and pass it on to someone who knows a bit more than I do about technology and repairs. I appreciate your knowledgeable feedback and will use it to the best of my ability!