HP9836C colour alignment (grey scale tracking)

Well, I certainly wouldn't use any form of electronic meter (digital, amplified analogue, etc) for this. I was thinking of using a plain moving coil meter, possibly with a shunt resistor. Hmm, possible I suppose. Maybe I chould encase it in a metal guard electrode, connected to a 25kV supply. Or maybe not... More seriously, I haev come across moving coil meters being used at quite high voltages wrt ground (not as high as this, but 10kV or so). They were mounted several inches behind a thick perspex window -- this was not a 'lash up'. I would be prepared to try it, given a fairly inexpensive meter movement. For those wondering what the current state of this monitor is, I've cleaned up all the case parts and put it back together. It still works (so I didn't do any damage taking it apart), although there are still red fringes to the right of (say) white objects. I am not sure if this is a convergence problem or due to the change in video amplifier response due to that open-circuit 12.4k resistor which I've not replaced yet (I wanted to make sure the monitor still worked after I'd finished pulling it about before changing anything). -tony