BL
We used Professional Barco monitors widely throughout the technical infrastructure - they were, by default, capable of 4:3 or 16:9 - but only in 625 lines of course. We used modified CRT Visteks in the studio monitors stacks, they were modified after purchase to be switchable using a modification controlled by re-purposing one of the functions on the interface at the back of the monitor. In this way the entire monitor stack could be switched between the two aspect ratios by a single switch in the Vis/Ltg gallery. You had to make sure you didn't put a non-switchable Vistek in a position where a switchable one would normally live - you'd get smoke when you tried to switch aspect ratios on a non-modified Vistek. As I recall the mod was an external signal controlling a newly fitted relay that modified a resistor value in the vertical scan circuit - simple as you would expect.
The only professional 16:9 CRT monitors I ever used were at my first HD place. Odd as we were using HD CRTs to quality check material that would never be seen by the public in HD on a CRT
We used Professional Barco monitors widely throughout the technical infrastructure - they were, by default, capable of 4:3 or 16:9 - but only in 625 lines of course. We used modified CRT Visteks in the studio monitors stacks, they were modified after purchase to be switchable using a modification controlled by re-purposing one of the functions on the interface at the back of the monitor. In this way the entire monitor stack could be switched between the two aspect ratios by a single switch in the Vis/Ltg gallery. You had to make sure you didn't put a non-switchable Vistek in a position where a switchable one would normally live - you'd get smoke when you tried to switch aspect ratios on a non-modified Vistek. As I recall the mod was an external signal controlling a newly fitted relay that modified a resistor value in the vertical scan circuit - simple as you would expect.