Before describing a further development of the invention illustrated in FIG 2, {HEAD ~ a suitable dual control electrode adjustable focus x ray tube} for using {TAIL ~ the new self compensating biasing voltage supply} will be described in reference to FIG 3 
Before describing a further development of the invention illustrated in FIG 2 , { HEAD ~ a suitable dual control electrode adjustable focus x ray tube } for using { TAIL ~ the new self compensating biasing voltage supply } will be described in reference to FIG 3
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH