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Ugh, straightening the ground spring did not fix it. The white streaks (comets) are still present in the same horizontal line, no worse or better than before. I noticed the center knub is not rotating completely true to center, but even when I lifted the spring completely off the center contactor the output didn't change at all.
When I rotate the head by hand, I hear a slight crunchiness inside. I'm wondering if there are similar slip rings or contactors inside of it that are corroded and part of the reason the head was locked and had to be broken free. I think I'm going to have to figure out how to remove this head and look inside.
I too saw that notice about JVCs and their "comets". This looks extremely close to that, except it's confined to only one or two horizontal lines near the upper 1/3 of the screen. The rest of the picture and the HiFi audio are perfect. There is also a tiny 16V 10 uF capactitor on the bottom of the head assembly. I think I saw JVC or some other machines exhibited this problem when that cap goes bad.
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