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Yep, carbon tracking can cause a lot of heartache. I once had a Philco 17MT80 roundie with intermittent reds, which I traced back to a carbon track going to ground from the plate of the red output tube. I was able to grind out the carbon from the PCB with a Dremel, then fill it in with epoxy. Whole PCB would have been a loss if I hadn't been able to fix it.
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Evolution...
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