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Thanks so much for your thoughts and guidance. I'll answer your troubleshooting questions one at a time. I'll preface this by saying the TV was in original condition when purchased. My restoration has been limited to component replacement. The 120V AC fusible resistor was bad so I mounted a fuse holder and the inch or two of wiring necessary to facilitate its mounting. That's the only change to the original wiring I have made so if there are lead dress issues to be found, they would be in the factory wire length and routing and not in any changes made by me. So to answer questions regarding wiring out of the tuner, wiring in the IF section, shielding of tubes etc...everything is as it was. The IF tube shields are adjustable in height to make tube removal easier but they have been extended to full height during all of the process.
I swapped out all of the original tubes with NOS tubes but I've not done extensive replacement troubleshooting, just the 8CG7 and the 8AW8 several times (Horiz Osc/AFC, Video Output/Sync Sep). I'll try the screwdriver probing for changes in the picture but all coils in the IF section are shielded below metal enclosures. The antenna input from the video generator is clipped to the 2 lugs on the tuner case so I could reattach the twin-lead antenna wire and connect the generator to the end of the wire but I've worked on several of these TVs and direct connection into the antenna lugs on the tuner has never been an issue.
I'll try nudging the IF coils a bit and see if that changes anything.
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