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Topics - acalltoarms1087

#1
First post on this forum, so go easy on me!

I have a 2002 Fender Stage 160.

I'm having this awful humming noise coming from both of my speakers in this combo amp, and I haven't gotten to play in almost two weeks now. I'm desperate!

The story:
I was jamming out with my friend the other night, and out of nowhere, my amp started making a noise indicative of someone in the ICU. Of course I immediately shut it off and powered back up, still the same noise.

My take:
I'm an idiot.

I took a few steps already to attempt to narrow down the problem, and here they are:
1. unplugged EVERYTHING else in the room to rule out interference
2. unplugged my boss MetalZone pedal, to rule out 3rd party malfunction
3. used a different 1/4" cord, to rule out malfunction
4. unplugged the control pedal that was included with the amplifier to rule out malfunction
5. unplugged and re-plugged the two separate cords that connect each celestion g12t to the onboard processor

Also, there are a few things I have noticed that may narrow it further:
1. when the volume knob is turned, the humming neither increases or decreases in volume
2. changing channels (from clean to the onboard distortion) does not affect the sound whatsoever
3. the DSP effects onboard the unit do not change the sound at all
4. the external wiring in the speakers themselves seem to be okay (I played with them a little bit, no noticeable shorts or anything like that)

With a guitar plugged in, my input still plays, but the humming is there.

She is in my basement, where I have an industrial dehumidifier to eliminate moisture for too many guitars and 2 drum sets, so I think corrosion of metallic parts is not a possibility.

At the moment, I have the amp mostly taken apart (yes I know how it goes back together) and to be honest, I don't really have the slightest idea what to be looking for. I'm fairly confident that this has nothing to do with the input female or any of the onboard knobs or any other possible outside interference that I know so often messes with these fragile ticking time bombs.

Any help would be greatly appreciated!