"If I put my finger on the unconnected end of the IC, the humm sound get a little louder."
That would suggest that your cables have rca connectors. Your picture shows old Krell amps. I'm pretty sure you need to have the pins in if you are using SE cables. If you don't use pins, then there should be a switch somewhere. If that's not it, you may have a damaged cable or connector.
That would suggest that your cables have rca connectors. Your picture shows old Krell amps. I'm pretty sure you need to have the pins in if you are using SE cables. If you don't use pins, then there should be a switch somewhere. If that's not it, you may have a damaged cable or connector.