Yes, those are aperature grill lines. I'm still using mine from 1996, but I just ordered a 19" LCD. Time to retire the old guy.
(quote)
Trinitron monitors, which were created by Sony, use a different style of making technology known as the aperture grill. Where the shadow mask is a single piece of perforated metal, the aperature grill is made up of a series of thin metal strips sitting in a top-to-bottom alignment. While structurally different, the two masks perform the basic function - masking the electrom beam from un-targeted pixels. The aperture grill design has a few effects on the final picture that some notice, some do not. First, some say that the picture is brighter on Trinitron monitors because the aperture grill allows more energy from the electrom beam through than does the shadow mask. Some say the picture is clearer overall. Also, the shape of the screen is said to have reduced glare potential than the shadow mask design. Since the metal strips in the aperture grill run from top to bottom and are straight, these monitors have screens that are flat from top to bottom, but curve slightly from left to right. Shadow mask monitors typically are slightly curved over the entire screen surface (unless you have a bonified flat-screen CRT). One complaint some people have is the appearance of little lines in the screen, usually very dull, but there nonetheless. This is because, on larger screen sizes, the small metal strips in the grill can actually vibrate slightly. Manufacturers inserted a few tiny wires to go across the grill from left to right in order to stabilize the grill. Some say they can detect the reflections on the screen of the lines where these stabilizing wires are.
(/quote)
Bill
Oh yeah, if I remember correctly, I paid ~ $625 for this 17" monitor back in '96. Glad they aren't that expensive today.