I enlarged the photo of the schematic, and the portion that is not covered up definitely looks like the 630. It has the 4-tube horizontal oscillator & AFC circuit used in the 630, and in one of the chassis views you can see dual 5U4G's, locked in their sockets by base clamps (the 630 uses dual 5U4's).

The tube size is confusing . . . he claims it measures 14"wide, but I can't find a round tube that size . . . perhaps it is a 16CP4 (glass round), and an inch of glass is masked on each side for a useable screen dimension of 14". The 630 uses a 6BG6G H.O. tube & 6K6 V.O. tube. That combo will sweep a 16" tube with power to spare.