Well, the Trinitron tubes make sense, since the phosphors on a Trinitron are laid out much like the LCDs are laid out on an LCD screen. That is, red, green, and blue sit next to each other horizontally, instead of in a triangle, like in shadow mask tubes.

However, I seriously doubt that Cornerstone makes tubes. In fact, they use both Trinitron and shadow mask tubes in their monitors, so, without knowing what model you're talking about, I can't comment on your experiences there.