Humming on a amp for iPhone -iPad at full volum

[sam_sam_sam]

The the problem with with amp

Is that when you have the volume all the way up it hums so you can hear it when going from one song to another
Is the problem in the power supply or the amp itself

It about 7 years old

I just wanting to know where to start

[japlytic]

Re: Humming on a amp for iPhone -iPad at full volum

The AC adaptor pictured here is of the switching type - does the "hum" sound like regular AC mains or does it have a buzz?
First, try using the amplifier with a different AC adaptor (around 12-14V @ 4A) and note the results.

[rhomanski]

Re: Humming on a amp for iPhone -iPad at full volum

Hum usually means some capacitor isn't filtering AC as good as it used too. What that means for your equipment is hard for me to say since I don't have anything like that. I have old amps and I've had that but it was on the power supply board and the hum was in both channels. When things are separated you can get impressed noise from wiring between the pieces.

Oh okay, we posted at the same time japlytic. You probably are much more familiar with his equipment.

[japlytic]

Re: Humming on a amp for iPhone -iPad at full volum

If you place your ear close to the power supply brick, do you hear 60Hz hum or buzz and if so, is it significant?

[sam_sam_sam]

Re: Humming on a amp for iPhone -iPad at full volum

Thanks for all of your replys this give me a place to start looking to fixing this problem