Vintage HP test equipment use a lot of Hitachi CRT module with different branded tubes. I repaired several "CRT modules" that had bad capacitors. But the fault on the original picture looks like it can be coming also from the CPU board (maybe bad video RAM?), or it can also be another case of bad capacitors. The boards I repaired had different symptoms, like shrinking images, flickering video, burned fuse, big explosion and no video, etc.