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Ground hum?

Hey all- new to this asylum. I added a new pre amp to my chain a few months back. I was previously using the built in pre amp. I never had any hum with the built in pre amp and I do now. I make my own cables, so tonight I went straight from built in preamp, direct to the amp and bang, no hum.

My initial thought is that I had connected the cable shield to the wrong end but cables are as they should be. Both external pre and deck are earthed. I removed the earth from the external pre and the hum got worse.

Any ideas? Typically only hums above 80db.

I'm loathe to buy a new preamp if this happens again.

For reference, the pre is a musical fidelity V90 LPS that get great reviews. I upgraded the power supply to a linear power supply unit as well.

Edits: 01/20/24

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Topic - Ground hum? - mbrierley 10:13:05 01/20/24 (12)


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