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are some phono stages more resistant to hum?

After a tonearm upgrade, which mostly involved "improved" shielded cable, it now hums with tube phono stage (upgraded AR PH3-SE)but no hum with backup ss device (DB Systems). It appears the hum originates with the new wiring, but why would one phono stage be impervious to the hum? Do phono stages have different grounding schemes, making them more compatible with certain tt/tonearm/wiring combos in unpredicable ways? Are ss phono pres less susceptible to hum? Have you ever changed phono pre to cure a hum incompatibility? I see from forums that tt hum problems are common and sometimes difficult to solve. Shouldn't a shielded cable be more immune to hum, not less?
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Showing 1 response by mofimadness

mofimadness's avatar
mofimadness
4,933 posts
 
One of my phono stages is the same ARC PH-3SE as you have. I have used this with at least a dozen different tables and arms and have never had a hum problem.

You are absolutely right that a "shielded" cable/wire should have a much better resistance to RFI/EMF/hum.

I think something is amiss with your setup. Who did the rewire and what kind of wire did they use?

Did you have the hum before the rewire? If not, it has to be in the rewire somewhere.
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