Newbie's First Questions RCA TS 721 Restoration

[Chris K]

Hey all...back at it with the 721. I discovered my HV probe was faulty reading voltage at about 50% of its actual value. I also acquired the parts chassis and with other purchases, I now have 3 working transformers, 3 flybacks, 3 focus coils and 3 different ion traps! The traps, 2 passive and 1 electromagnetic, all work well. The parts chassis I purchased is a very early model, serial #1265 while the chassis I'm restoring is around #65,000 but they're similar enough that they share around 95% parts compatibility. It looks like the EM ion trap is the earliest beam bending effort, the passive magnetic collar and ring the second and a clamp style, square bar magnet type, the last type used on this set. I got one hell of a shock last night moving the focus coil around on its pivots and I'm wondering what that's all about. I had my fingers on both the body of the coil and the metal support structure so I need to look for whatever might be touching the chassis on the underside.
Focus of the picture is poor despite rotating the focus control to its limits. The best I can get it is still soft. Does anyone have any suggestions as to what I should be looking at other than the variable focus pot???
New doorknob HV cap also!