H9 hum

[owen33]

My H9 hums when powered.  Is this normal?  It's really loud on power up but there is still a hum coming from inside the pedal.  Its not in my guitar amp chain, it's the pedal itself… just sitting powered on making a slight hum.

[gkellum]

No, that's not normal.  You're powering it with the Eventide power supply?  Does it sound like it could be a ground loop?  

[owen33]

Powered with the eventide supply.  That is the only thing plugged in.  No guitar or amp.  It makes a hum noise like you would expect a tube amp's transformer to make.  It works fine but something internal in the pedal is making the noise.

[owen33]

Using the supplied eventide wall wart.  That is the only thing plugged in.  No guitar or amp.  Its something internally in the pedal humming.  Like a transformer would hum.

[AAgnello]

Hum is usually a ground loop. If the H9  supply and amp are plugged into different power strips or outlets and the grounds aren't solid you could hear hum.

[AAgnello]

We haven't run into this before. If the pedal itself is humming please send an email to support@eventide.com. 

[nickrose]

Is the USB plugged in ?

[owen33]

No, just the power plug, no usb, no 1/4 in plugs to guitar or amp, nothing else plugged in to the power strip.  On power up it's a loud hum followed by a click and then a less noticeable hum.

[nickrose]

I think we all misread your posts, and figured that the hum was heard at the amp, whereas you are saying that the pedal ITSELF is humming.

This must be a hardware problem, probably in the internal power circuitry, so you should contact support@eventide.com. Sorry.

[doombie22]

i get it sometimes with my usb plugged in

[nickrose]

doombie22:

i get it sometimes with my usb plugged in

This will be a different thing, probably a ground loop. Try and make sure that everything connected to your H9 (including your computer and monitor) are plugged into the same power outlet.

[Author]

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