Cable connecting preamp to external power supply

For those of you who have a preamp with an external power supply, have you found that the sound varies depending on the cable connecting the preamp with the power supply?

I was surprised to find in my system (power supply is DC) it made a major difference.
My MF M3 NuVista has cables from the power supply to both the amp section and preamp section. When I replaced them with better ones there was a considerable difference.