Been playing with the 21AX set up -
After the reminder about degaussing, I did it, and everything (purity, convergence) changed drastically. This did not happen with the glass tube, so I assume it's the metal cone itself that is the problem. I have been able to get the pure field purity back, but now white field purity is not so great. Probably have to play with the edge magnets.
Dynamic convergence on this tube is a problem - can't seem to get enough vertical red and green amplitude. The internal dag on the tube hides the pole pieces, so it's hard to tell where the proper convergence coil location is. It also seems like the blue lateral magnet interacts with red and green more than on the glass tube. I'm guessing there must be some differences between this gun and the ones Scotty used.
CAM00029 by
old_tv_nut, on Flickr
CAM00028 by
old_tv_nut, on Flickr
CAM00026 by
old_tv_nut, on Flickr