Amp squealing with effects, good without

Discussion in 'Effects, Pedals, Strings & Things' started by tim.crowe, Apr 13, 2015.

  1. tim.crowe

    tim.crowe Member

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    So my buddy just got a new custom made amp. It sounds amazing, but when he puts his pedal board in front of it, it gets a weird high pitched squeal when it's on the overdrive channel. It doesn't happen when he plugs straight into the amp, and it doesn't happen when he goes through the effects into the clean channel.

    Anyone experience this type of thing? Any ideas?
     
  2. 8len8

    8len8 Member

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    Are the pedals powered win batteries or a power brick? Try adding one pedal at a time until the squeal starts.
     
  3. NewDr.P

    NewDr.P Member

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    What type of effects? Gain, I'm guessing?


    Sent from my iPhone using Tapatalk
     
  4. goodhonk

    goodhonk Member

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    wah plugged in backwards?
     
  5. tim.crowe

    tim.crowe Member

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    Hey uses 2 pedal powers, so it's all isolated. He tried a couple of different combinations but not the pedals individually. He mentioned giving it a try though. Thanks!
     
  6. tim.crowe

    tim.crowe Member

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    There's an OD in there but not anything high gain. It happens even when the pedals are off, so feedback from gain has been ruled out. I'm thinking maybe some sort of ground loop issue but I don't know enough about that stuff to be sure.

    Thanks!
     
  7. tim.crowe

    tim.crowe Member

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    Haha, no. There's no wah in the line.
     
  8. tim.crowe

    tim.crowe Member

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    It's also worth noting his rig is stereo. Could it be some issue related to that? Maybe the amps are out of phase or have a ground loop issue when the OD channel is engaged?
     
  9. DaveKS

    DaveKS Member

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    Some pickup and cheap cables can be microphonic. Roll vol knob off does it stop? PU. Still there move/wiggle cables around, hear rustling sounds through amp, you've found that cable.
     
  10. tim.crowe

    tim.crowe Member

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    Thanks man, I'll have him try it out.
     
  11. stucker

    stucker Member

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    I'll bet there is a bad connection (grounding issue) from his pedal power to one of his effects. I unfortunately had this same issue at a gig. Soundcheck was flawless but I needed to move my board out of the way before the first set.

    Once our first set started my Strat was wanting to squeal every time I played fills or played a solo. It seemed as if the high-mids had increased on their own! And my volume pedal wouldn't work correctly (only on or off)!

    I made it through the set OK but everyone complained that I was too loud (not understanding what was going on). During the break I discovered that the cable from my pedal power to my Rockett Blue Note had a crimp and the connection was intermittent. At least the conncetion didn't open-circuit during the set.

    Have your friend check all his power cables!
     
  12. tim.crowe

    tim.crowe Member

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    Thanks for the info. I'll mention it to him. I'm not sure if he's been keeping track of this thread or not. And that sucks that happened to you. Nothing worse than gear messing up a show.
     

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