Hum is doing my heid in

I had wall wart linear psu’s made for both the Well Tempered and the P75/2. The switch mode psu’s were the problem in my case. I cant remember which one was actually the culprit as it was quite a few years back. They were cheap enough, around $70nz each and I was lucky that a company called Transformer Specialties was only 2k from home.

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