[mole42uk]

I checked the main power supply PCB this morning before work, and there is no evidence that I could measure or see that the main regulator ground is connected to the pre-regulator ground, so the drawing is in error.

I've a plan now to set up test cells for each half of the high-voltage primary side of the power supply so that I can verify that each does what it should before committing the whole to operation. As I have two complete supplies I think that makes sense so that I end up with two working supplies rather than two dead ones as at present. After that the secondary side should be straight-forward.