Why does my green tube glow for 10 min after i turn off my pj???? Neither blue or red do this even if g2 and drive are set the same way. Is the green phosphor on a marquee different the red and blue as far as persistance, or do i have something wrong. I have a marquee 8000 92 vintage. Any ideas??? oh by the way g2 is set at 71 drive at 85 on green red is g2 70 drive 35 and blue is g2 71 drive 63.