Grounding techniques

[flester]

This is amp.  https://imgur.com/gallery/0DvnHiX

Works fine with this ps. not much noise using pedals on battery. https://imgur.com/gallery/49d8gK3

The noise comes in when I use this.
http://imgur.com/gallery/02LCUTt

Works well with a friend's  amp and



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[flester]

Problem solved. I changed the mains adaptor supplying the pedal power supply. Noise now much at unacceptable level. Thanks again for your input. it stopped me going off om a fruitless and maybe expensive tangent! All for the price of four 9v batteries.

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[flester]

The mains adapter that worked has now died. Any tips on how to buy a new one that is not noisy?

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