Amp Hum Help

[JoeNovice]

I've got an AC30CC head. It sounds great when it doesn't hum. I've tested the head at other locations and it's not the source.

I think I'm dealing with a ground-loop issue.

If amp is on without cable plugged in..... no hum

If amp is on with cable plugged into guitar.... hum, varies based on position of guitar.

If Ebtech Hum Eliminator is pluged into signal path.... hum changes but doesn't disappear unless I touch something metal like the standby switch or another 1/4 jack on my keyboard.

Ebtech Hum X didn't fix the problem.

If I touch the speaker cable while amp is on I can hear RF or some type interference.

AHHH!!!!!!!! This sucks..... any technical comments would help.

 

[notbradsohner]

loose or non existant ground on the guitar somewhere.

 

[JoeNovice]

I thought that as well but it happens on all three of my electrics.

 

[Innovations]

Maybe the cable, maybe the amp connector, but it definitly is a ground problem because you are creating an alternate ground route when you touch the input jack on your keyboard.

 

[JoeNovice]

Doesn it also create an alternate ground route when I touch the standby switch on the amp?

This will remove the ground only when the hum eliminator is in the audio chain.