There are two very fine black lines on the screen

 

I bought a MAG 796fd monitor and found two very fine black lines on the screen , what is not CRT quality problem ?

 

A: The two thin black lines on the screen is called the shadow of the gate line or shock cord, which is a unique feature Trinitron CRT , CRT is not a quality problem . MAG 796fd because unlike conventional CRT CRT shadow mask , which has many parallel longitudinal aperture grille of the upper and lower ends of the vertical border of the screen is connected , not connected between the transverse aperture grille screen , if no shade each aperture grille gate line connecting them , the screen display when the screen prone to shaking.