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Yup, I overlooked the fact that the shield was connected to the shield at one end, even if it was insulated from it through the length of the cable. It might be possible to make this work by ensuring that an RF frequency signal has a lower impedance to earth in one component than the other...

Ah, I see what you're saying. I was thinking along the lines of stuff I've done with umbilicals between power supply boxes and audio amplification boxes, but there the shield is an independent conductor from any of the voltage-carrying conductors. I've read accounts of people who had hum with...