Hum/buzz in Dual Rectifier rig

[inprognito]

Hey guys I recently bought a used Dual rectifier (2002-2004?) and have been dealing with the horrid parallel effects loop. As for effects I usually only use reverb and delay, but I acquired a pod HD500x a while back and wanted to use it for effects(I've been experimenting with many effects on it) and I also really like the sound of using the pre-only models with the cab models turned off and plugging into to loop return. Now obviously having it in the effects loop for effects creates bad phase issues and it just kills the tone no matter how I have the settings on the back panel. I'm most likely going to get the loop modded but I had an idea on how to use the HD500 and the recto together but it's causing some issues. Here's how I have it:

Guitar-->korg pitch black-->boss ls-2-->the signal then splits

One side is: boss ns-2-->maxon od808-->rectifier input.
This I wanted to use for my rhythm tone. I have it set on channel 3
Modern for that aggressive rectifier sound.

The other is: HD500x-->rectifier loop return.
I wanted to use this for my cleans and leads and other effect laden
Sounds.

Now, tones all sound great, i can step on the line selector and instantly switch to a different sound between the HD500 and the rectifier. The problem is that I have a very loud annoying 60 cycle him/buzz. I have tried noise suppressors and gates in different spots in the chain, tried a hum eliminating plug thing and none of that seems to help. I did find though that if I unplug either one of my inputs (either the input on the front panel or the input on the back in the loop return) the hum disappears and the amp is silent. Does anybody have any ideas? I don't get hum from any "normal" setup, but I really wanted to make this work for the sake of versatility.

 

[Dave L]

Well, I would try lifting the signal ground on one side of the cable going from the POD to the loop return. It´s just a ground loop somewhere, and considering how simple your set-up is it almost has to be that one.

 

[inprognito]

Excuse my lack of knowledge here, but what would be the best way to do that? I tried the ground/lift switch on the POD and it did nothing.

 

[Dave L]

That ground lift is for the balanced XLR output, which I´m guessing you are not using in this application. You could use it, though, with a XLR to TRS or XLR to TS cable.

As for lifting the ground on the cable, you just grab a soldering iron and disconnect the shield wire from the sleeve of one of the plugs and mask it off so it doesn´t touch anything metal inside the plug. Might be an easy fix that way.