A quick CTC 16 question

[JohnCT]

Don't put on a brightener or otherwise "clean" or boost the tube with a tester.

Put the service switch into the service position and advance the G2 controls to get a dim line on all three colors (just extinguished is better). Move the bias switch if you need to in order to get a line across the screen. if you can achieve this, put the switch back to normal and you should have a raster.

If you can't get a service line with your three G2s up or you can but aren't getting a raster, you need to troubleshoot this and not just guess that the tube is weak. For all we know, the last guy put the booster on it for the same reason you think it needs one - it may not.

John