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Hum in preamp when using HT bypass

I have a Sim Audio P5 preamp that has an HT bypass input. AT first I was using RCA interconnects from CD to preamp, preamp to amp and the HT bypass and had no problems. When I switched to balanced from CD to preamp and preamp to amp leaving the RCA connection for the HT bypass I am getting the hum. There is no balanced input for the HT bypass. When I choose my CD input I do not get the hum, only when I switch to the HT bypass input. Any suggestions?
kayoboy

Showing 2 responses by audphile1

audphile1's avatar
audphile1
5,443 posts
 
I was going to suggest trying rca to xlr adapters, but you don't have XLR input for HT bypass.
so, most likely it's a ground loop from your catv. try disconnecting your coax cable from your cable box and then turn the system on to see if there is still hum. If the hum is gone, then get the Mondial magic box or something similar.
audphile1's avatar
audphile1
5,443 posts
 
may be the ground connection is not soldered properly on that input?
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