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disconnected the shunt tube, KV shot to 30kv so I have to assume there is a problem in the shunt. Tried a new tube, no change in Vdrop across the test points (1.7v) so I will focus on the few componets around the shunt, there is not much there so hopefully it will be an easy fix. 1st check will be that 1.5 meg resistor.
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