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Well, it's also an opportunity for a noob to see how the back-bias system works to supply negative voltages. The centertap of the HV winding, instead of going directly to ground as it normally would, goes through a resistance that's tapped for the different (-) voltages.
Troubleshooting without understanding the back-bias thing would be confusing, as evidenced in the thread.
(Of course in this case, there's also a focus circuit and ion trap whose summed resistance forms part of the resistor chain.)
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