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Thanks for the additional information; I agree with your assessment so will not be touching the switching point or anything related to it at this point.
I tried some graphite lube for key locks last night on the ground strap contactor and it didn't make a lick of difference. The white streaks were still present at the same location on the screen. I see the grounding contactor has a divot worn in it and it's not rotating on center, but if I pick the strap completely off the head while it's spinning it doesn't make any difference either.
What is intriguing me about this defect is the white streaks appear in just about the same exact horizontal line no matter what tape I play. All other references I've seen for white streaks in playback exhibited randomness in their appearance. Admittedly I'm not sure where to go here, but I think I either need to check every capacitor on the board and see if one is bad, or take the upper drum off and see if anything jumps out at me.
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