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Need Help with Hum

I have a Krell 400cx, Krell KPS-25sc, Musical Fidelity Tri-Vista SACD, CAST cables, Von Gaylord Chinchilla ICs, Siltech Power cords, Siltech speaker cables, Rotel power conditioner, JM Lab Mini-Utopia, JM Lab Sub.

The system was working perfectly; not a spec of hum, dead silence.
I installed separate 30 amp and two 20 amp lines for the system, Hubbell outlets, and ran the wires below the floor to the outlets. IT all works but now the system has a faint hum but only when the Krell KPS preamp/CD is on.

Can anyone help me as to a starting point to diagnose the problem?
I am most appreciative. The work was done by an electrician who specializes in these kinds of home-tech installations and will also try to address it but I thought I would also ask all for ideas.
huntermusic

Showing 1 response by kana813

kana813
956 posts
 
Float/lift the ground connection on the Krell KPS preamp/CD with a cheater plug and see if the hum goes away.
If does than check the wiring as Kal suggests, if it doesn't, check and make sure the hot & neutral on the AC
line feeding the Krell KPS preamp/CD are not reversed. Most hardware stores sell a inexpensive devices for checking wiring.
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