Hum ......... Which cartridge

[julesd68]

Thanks for that - is the cartridge another possibility? I seem to remember reading somewhere else that cartridges can develop an earth loop ...

[DSJR]

If the right hand channel hums, but not with red wire disconnected, I'd check the return (green) for full continuity.

The iPhono is well shielded but see if moving it around makes any difference. Don't set the gain too high and make sure you have fully inserted the phono plugs as this was an aspect hifi dave found early on with his demo sample.

The Nima shouldn't naturally have wiring issues, but check if the arm is properly earth-connected to the deck chassis (can't remember if it should be - so long ago). If the arm earth is connected at the iPhono end, try taking another wire from this point to the amp and see what happens.

Good luck

[julesd68]

Dave, sorry to have confused the thread - I'm not the OP, and apologies to the OP for jumping in with a hum problem of my own!

When you say check the green for full continuity, what do you mean?

[Ned664]

So, it was the cartridge, purchased a New Sumiko Blue Pint Evo III and no hum! Which is great but also perplexing and a bit frustrating as the Benz Micro is a great cartridge and only around 6 months old. I think that the greater gain from the iFI phono stage revealed the hum as it is barely noticeable at lower volumes, but I am sure it was not there when first installed. Curious- maybe cartridge abuse from late night, inebriated use?
Incidentally the Sumiko is fantastic straight out of the box, looking forward to how the sound will develop over time. Bass not as deep as the Benz but is taught and controlled and the sound staging is just incredible.