Darryl the hum-hunting game is basically a process of elimination. Begin with your amp (or receiver, or integrated) plugged into AC with speakers only connected, no input cables connected yet. If clean, then next add the preamp only, no AC connected, no sources connected, see what happens. If amp-only is not clean then begin trying some of the ideas that you've read about. Continue adding connections & eliminating the hum (via tweaks) as it may occur. That's the basic process.
I assume from your post that you've having some hum problems & you don't know exactly why (welcome to the club). Please experiment & make some notes, then if you're still stumped you may shoot me an email & we'll best discuss your specifics via a phone call. Click on my username to initiate email contact & simply follow the hyperlink.
I assume from your post that you've having some hum problems & you don't know exactly why (welcome to the club). Please experiment & make some notes, then if you're still stumped you may shoot me an email & we'll best discuss your specifics via a phone call. Click on my username to initiate email contact & simply follow the hyperlink.