It's probably not a resistor. Looks more like a diode of some kind, but make sure of that.
Next step is to google the service manual or schematics. Find any and all numbers you can on the chassis, neckboard and tube proper, and see what comes up. You can also try the machine name, etc. DO NOT presume that anything you find is correct until you've checked it against the board you have, to make sure they're the same. Then replace the component.
You might also think about checking components around it. If it failed before it broke in half, something might have caused that failure, and you'll just destroy your new part, or even destroy other parts.