1966 motorola 23 inch color

[ctc17]

Does it go away when you turn the color down?
If so good chance its the crt. How are the emissions at 5 volts? If the emissions show good at 6.3volts but sharply drop off as you lower the voltage to 5 I would be looking at the crt.
Red bleed and smearing are one of the signs of a tired crt.