Getting back to my 721 for a moment.
I cleaned up the cabinet, and reassembled it, made all the little adjustments and so forth.
As always some little problem had to rear it's ugly head.
When I was working on it I used a small test CRT and a scratched 10BP4, but now I put the original CRT in and it
Seems it has a H-K short when it warms up.
I'm getting streaks in the picture and it alternates between a normal and dark picture, tapping on the neck also aggravates it.
The B&K tester seems to verify it although it only shows a very small leakage.
An isolation transformer should cure this shouldn't it??