These supplies are switched-mode power supplies.
They generally are completely fine but I suspect that there are some pedals, types of mains power or other issues that can cause these noise effects some people get. Monitors nearby, smartphones, strip lighting etc
it could be that the rehearsal room/venue/house you're playing in has a dirty power supply and that's the cause of the noise.
I have had zero issues with both my JSF and Diago supplies. I don't think there was anything wrong with the supply itself but something in the surrounding interconnect/system that wasn't right.
thinking of splashing on a few nice bits
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