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Thanks for all the replies, it's a great help.
The 12m DC cable run was inside a conduit, alongside and wrapped around an AC extension cable, so it didn't really have a chance. I moved the power supply much closer to the mount, connected with 2.2m of 12AWG cable. The voltage is much better, staying above 12V 95% of the time, although it droppped to 11.9V at one point (slewing on both axis with scope fully loaded). I'm going to get thicker wire, just to be sure of some headroom.
I also got in touch with Skywatcher/Tasco, and got a good email from a support agent, Graeme, who said
I always suggest no less than 7.5 AMPS for a NEQ6. 5 amps should be OK but I have had issues with that amps which was rectified after upgrading to 7.5A MPs
I think I'll get a silent power supply - it's hard to contemplate space and time with a noisy fan running.
Thanks for the help.
Stephen
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