I came across this video the other night while looking for a schematic for my scope, which also happens to be a Dumont 208A.
http://vimeo.com/11253437
From the Video description:The groundbreaking clip is a collaboration between director Jared Raab and artist/computer programmer Rob Bairos. The video was culled from footage recorded entirely off of a vintage oscilloscope.The footage was shot once on video, edited, converted for use on the oscilloscope and then shot again directly off the vintage machine.
Also, does that TV chassis to the left of the scope look familiar to anyone?