Phono One grounding


I have a Phono One card between a Pro-ject turntable and a valve amp - before that it was going into a vintage but solid state amp and there was no humming, whereas now I can't make it go away.

I initially tried getting a grounded power supply for the Phono One but that alone didn't help, so I got another one for the turntable which made it even worse! Somehow a non-grounded tt into a grounded pre-amp gives a better outcome, though not perfect.

So I suspect I am missing something... I tried to connect the ground port of the tt to that of the Phono One but that produced not difference... Can anyone suggest a setup which would work like into my old solid state amp? Obviously this is a very 1st world problem but I would like to understand what's going on.

Many thanks in advance Vincent.


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