I have a Nanao (Toshiba) tube from a 2930 monitor (Sega Blast City) totally free to a local home. The tube has some burn in the form of SF2 life bars. It includes a working neck board and a dead 2930 chassis, it DOSE NOT include mounting frame.
lantus360: I did swap out the monitor, got a WG K7500 locally for 50$ from a broken Golden Tee cab.
Its no where near the quality of the Nanao, but it has zero burn and very vivid colors.