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Well now that I looked it does appear both Sams and Riders voltage references are from chassis ground. I do think the b- dropper string is easier to understand looking at the Sams schematic. B+ center tap is connected through the focus coil and 3 series resistors to ground. Because all b+ current passes through those components it creates a negative voltage across it's path to ground. The closer you get to ground, the less negative the voltage becomes. Hope that makes sense?
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