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HD500X - plus amps - ground loop hum ?


AFD-100
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I'm running two 'real' amps on two separate paths on the HD500x - this is exactly what I've been doing.

 

one amp is a laney VC30 - I use the power amp section of this, going into the amp effects return loop input - effects are on the HD then a pre model (input into guitar, output 1/4" left)

second amp is a Marshall AFD-100 & 2x 4x12 - using the fx loop on this, just running simple effects - chorus, delay, reverb etc

(input into Aux, output 1/" right)

Mixer 'panned' hard left & hard right 

 

(my guitar input has an A/B switch so I can select either HD input path & the corresponding amp)

 

All functions fine 

I do however have one problem - hum

sounds like an earth loop - but I can only hear it on the Laney !

the Marshall is 100% silent

if I disconnect the marshall send & return feeds, the hum disappears totally

any suggestions ?!

 

thanks

David

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Are the amps plugged into the same power strip along with your HD500x?  Is it quiet if you use one or the other amp only?  If so, you need to either change how they are powered or get an isolation box for one of the amp connections.  That should solve your hum problem.

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