GCX and amp problems.

  • Thread starter Thread starter Captain Chunkulus
  • Start date Start date
Captain Chunkulus

Captain Chunkulus

New member
Okay, I'm at my end with this, hopefully you guys can help.. I have gone through my rack and completely isolated all of my gear from each other and the rails and all of my gear is on the same power, I have all brand new cables and still I get a ground hum.. Here is my set up.. Peavey 6505 plus, gcx, rocktron replifex, keeley compressor, mxr flanger, mxr chorus, boss 59 fender bass man pedal..
Loop 1. Keeley comp
Loop2. Mxr Chrorus
Loop3. Fender Bassman pedal
Loop4. Mxr Flanger
Out of loop 4 into loop 5, Loop 5 send into the front of my amp, The send from 6505 back into Loop 5 return, loop 5 out into loop 6.
Replifex into loop 6 and then loop 6 out back into the return on the 6505..
I did this so I could insert my amps preamp into a loop and still use the power amp of the amp while bypassing the front of the amp because I want be able to bypass the front of the and just use the power amp section of the amp.. Anyway, I have gone through and taken all of the pedals out of the gcx and just left the amp insert and effects loop set up the same and still getting hum. I tried just running the replifex into the effects loop of the 6505 and no hum.. So the hum is being created in this preamp insert in a loop / replifex combo setup.. I tried lifting the ground on the cables going in and out of the effects loop of the 6505 and this helped but did not get rid of the problem. Side note, when I play straight through the gcx straight into the 6505 no hum at all either so, there is something about this set up that is creating a ground hum or lack of ground or something.. I have been thinking about the ebtech hum eliminator but what do you guys think? Thanks..
 
Call John Clark at Voodoo Lab and he should be able to help you. Also there is a ground wire you can actually unscrew inside the GCX itself and that might help. Call John first though since he designs this stuff and knows it inside and out.
 
You still need transformer isolation between amps. The GCX will not do this for you only provide discrete switchable loops.
 
I went round and round with this problem also. The returns of the GCX have the ground lifted. Make sure you are not using cables that have the ground lifted at one end. That is a recipe for a headache.
 
A isolation transformer should fix the problem in front of the amp after the send.
 
Is this something you can buy "brand wise"?
Or a custom gizmo
 
:confused: Is there some thing with iso, phase and ground lift that works well with the GCX or similar ? It would be cool if you could control all three and was in one box.....
 
The hum eliminator is a isolation transformer. It has 2 of them. It will work.
 
The basic one that looks like a plug or the ebtech with 1/4" in and outs
 
Back
Top