Not Quite Sure What To Call This

[old_tv_nut]

Nobody have an idea? I have to say I can't guess why.

Also hard to see exactly what the symtpom is ...Hard to tell if the white bleed is actually starting AFTER the first line of white letters and continuing onto following lines, or is across the whole first line as well as every line.

Can you do anything to the controls that changes it? If so, that might lead you to the section causing trouble. Other than that, no clue. Any change with fine tuning?

If you have spare tubes, I'd try changing IF, video amp, AGC, sync separator.

What set is this?