I'm trying to bring an Apple Studio Display CRT 17 back to life, a blueberry model. The unit I have worked, but exhibited a terrifying pop when turned on, and thus needed a flyback transformer replacement. I managed to source one and have a friend install it, but after doing so we noticed a component next to the flyback transformer was busted. It appears to be a glass resistor, but the thing is busted open so we can't read the value to replace it. With the new flyback in place, we get no pop anymore, and we can get a CRT glow, but no picture, and we suspect that resistor is a big reason why.
That resistor is labeled sg501, as seen here:
I actually found this forum by looking for info on this component, by finding this topic here: https://www.applefritter.com/content/apple-studio-display-crt-17-vga
It appears the user Oddball at one point had access to just the monitor I am servicing. Would he, or someone else, please help me in finding the value of this resistor so I can bring this beautiful monitor back to life? Much appreciate any consideration!