Surely the write speed to the tube face was faster with 625 so there was less time for the phosphor to take the electron beam current and light up. The difference in write speed is close to 50%.
Try it with a CRT scope and you will see an extreme example as you change the time base speed. You need to turn the brightness up.
Try it with a CRT scope and you will see an extreme example as you change the time base speed. You need to turn the brightness up.
