A voltage divider is connected between the negative side or cathode and ground and {HEAD ~ an intermediate point} on {TAIL ~ the divider} is connected to a focusing electrode in the x ray tube for providing a focusing bias voltage 
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A voltage divider is connected between the negative side or cathode and ground and { HEAD ~ an intermediate point } on { TAIL ~ the divider } is connected to a focusing electrode in the x ray tube for providing a focusing bias voltage
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH