Be aware that this is not a TV. The PVM Series of monitors are professional video monitors that are not offered for sale to mere consumers. This is the kind of thing that would be installed in the control room of a TV station to display the station's final output.
20 years ago the small video company I worked for had a $30K Sony PVM monitor that was probably only 30-35 inches. So the $40K price in 1990 doesn't surprise me in the slightest.
The only thing interesting about this is "biggest CRT ever made" because it shows the limits of CRT technology.