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karbomusic · 04-03-2020, 05:18 PM

The way those devices all interconnect (which has to be that way), if it's a ground (either loop or parasitic on the ground plane) it's there and not the actual AC plug.

Does this occur if you unplug the guitar cable from the device it's plugged into (so neither the guitar or cable is plugged in)? If a ground loop, the guitar should be irrelevant, if EMI going into pickups that's a different issue but that also usually has a 120 Hz component. Guitars are great for finding where wires are in your wall (no kidding).

Hum cancellers... I promise it is well worth your time and lack of frustration to have various types lying around and a couple extras - one of those AC types + a couple like the two-channel one like an ART DTI - these are LIFESAVERS in multiple situations - they have saved my ass multiple times - power conditioners not so much other than keeping any existing noise riding in on the AC line and voltage regulation.

04-03-2020, 05:18 PM	#4
karbomusic Human being with feelings Join Date: May 2009 Posts: 29,269	The way those devices all interconnect (which has to be that way), if it's a ground (either loop or parasitic on the ground plane) it's there and not the actual AC plug. Does this occur if you unplug the guitar cable from the device it's plugged into (so neither the guitar or cable is plugged in)? If a ground loop, the guitar should be irrelevant, if EMI going into pickups that's a different issue but that also usually has a 120 Hz component. Guitars are great for finding where wires are in your wall (no kidding). Hum cancellers... I promise it is well worth your time and lack of frustration to have various types lying around and a couple extras - one of those AC types + a couple like the two-channel one like an ART DTI - these are LIFESAVERS in multiple situations - they have saved my ass multiple times - power conditioners not so much other than keeping any existing noise riding in on the AC line and voltage regulation. __________________ Music is what feelings sound like. Last edited by karbomusic; 04-03-2020 at 05:26 PM.