ground loop hum in racks

[Neeklaus]

so, I'm familiar with the issue of extra hum induced in rack rigs where you need to isolate each piece from the rails of the rack it's mounted on.
previously, I used Hum-Frees to take care of the problem and they worked great.

I'm putting together a new rack rig now and I only have one set (4) of the humfrees - I can only isolate one piece in the rack using these.

luckily I have a pretty simple set up -
Power Conditioner
Preamp
Power Amp


so, which one should I put the humfrees on until I can pick up some more?

 

[Code001]

Have you tried putting it together without the humfrees first? No point in spending money if there's no need to, after all.

 

[Neeklaus]

good point, I agree and I plan on trying everything without the humfrees tomorrow as soon as I receive my preamp.

just trying to get some knowledge ahead of time

btw, i fucking love that pic of what I can only describe as "The Bugera Badass"
where's that from?

 

[Code001]

It's a pic of Jon Schaffer of Iced Earth with a wall of Larry amps. Donbarzini photoshopped all the Larry logos into Bugera logos, and Larry flooded his PM box until he took it down. Since donbarzini left the forum, I figured I'd help pay homage to him.

 

[Neeklaus]

ha! that's fucking funny.

 

[Ancient Alien]

Try it with no hum-frees first.
Then if you have a hum, simply lift the ground on the preamp with one of those grey adapters.
I can't think of any way you would get a ground loop hum with that simple of a setup.
I use the humfrees in my 20 spaced guitar rig, but that is really more for protecting the units from getting scratched by the screws.

 

[Neeklaus]

Ok, I'll give it a shot. I can't seem to remember if my previous rack rig (very very similar) actually had hum problems or not. But I'm guessing it did if I have these still.

 

[Anonymous]

Try it with no hum-frees first.
Then if you have a hum, simply lift the ground on the preamp with one of those grey adapters.

this.

 

[Neeklaus]

sorry, I'm unfamiliar with the grey adapter you are talking about....can someone link me?

 

[Code001]

I think he means this:

http://www.ebtechaudio.com/humxdes.html

 

[Anonymous]

i thought he meant this to life the ground prong:

 

[Neeklaus]

ah ok, well I have access to both of those.
my preamp has been delivered...just gotta wait til tonight after work to get to wiring and checking for hum.

Thanks again guys!

 

[Ancient Alien]

i thought he meant this to life the ground prong:

Yep.....
They are either grey or Orange and cost about a buck.

 

[Anonymous]

i mounted a gfci outdoor outlet in the back of my rack with about a 15 foot 10 gauge heavy duty cable attached so i can just plug in and go. then i have a radio shack electronic surge protector. then my ar117 constant power filter plugs into that.

the radio shack surge was cheap, it works and it's simliar to this: http://www.radioshack.com/product/index ... eCustomId=

im going to try putting a grey adaptor on each piece of gear in my rack as i get a nasty loop also.