Why Oh Why...another


I was swapping things around, and now have a humm. Before, there was no humm. When the amp is plugged into the speakers and my IC's not connected to it, there is no humm. When I connect even one IC to the amp, I get a humm, even if the IC is not connected to anything else on the other end. If I put my finger on the unconnected end of the IC, the humm sound get a little louder.

What's up?
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My system pic is very outdated and old. Those were Lamm amps. I have single ended connectors. I have VAC 300.1a amp now