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Hi folks,

Thanks for all your tips. I have just been in that counter. My main concern was that there was something bad going on causing that humming, like shorted diodes or caps. But there isn't, all voltages are perfectly in spec. It's really just the transformer being noisy.
Modding the existing power switch would need some serious rework on that nice gold plated PCB. I don't want to do that, since the unit is in perfect shape outside and inside and I want to keep it that way.
So an external mains power switch is the way to go here....

Cheers,
Wolfgang