Powervar power conditioner hum??

[bobbyonions]

I picked this Powervar 4.0 (4A) line conditioner up the other day. When powered up it has an audible hum. Not real loud, but loud enough to make me question whether it's normal or not.

Does anyone know if this is normal? It sounds about like a fish tank air pump.

If it's not normal, anyone know what may be the problem? I've included a nudie picture. Just a few caps and a giant transformer in there.

Would one of these be very useful for audio purposes given it was working properly? Looks like it was geared more for office use.

Thanks.

 

[rcspkramp]

Taking a guess here, but it could be transformer buzz.

 

[bobbyonions]

Taking a guess here, but it could be transformer buzz.

That's what I'm thinking. Just wonder if it's normal for this unit.

 

[stereocuuple]

not intended for audio at all. i would not use any supply rated under 20A and that device looks to be questionable condition a best.