I've just about got this set all squared away. First issue - the top being clipped and twisted was due to my 1077B being out of whack
I really need to properly overhaul that bugger.
Second issue - the brightness gradient was due to the CRT being mounted at a bit of an angle. See that gap at the top - the tube is tilted back a little in the yoke.
I fixed that up and the brightness is uniform now. I just need to tweak that yoke rotation and lower the picture a little to take care of those dark bottom corners. So close to being done
