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hiss/noise from the amps

Discussion in 'Pro Audio Equipment' started by detlef, Jan 1, 2009.

  1. detlef

    detlef Active Member

    Hello

    Since a couple of days I'm having an annoing reverbered hiss coming out of the amps. This happens with ALL my 3 amps (1 solid state and 2 tube).
    I tried to change the cables, still no luck.
    This noise sounds sometimes like a reverbered feedback.

    When the amp is turned on with no guitar plug in it doesn't make any noise. It start hissing when an instrument (any instrument, guitars or bass) is plugged in.

    It seems this problem affect all the audio equipment in the room, so I figuered out this is a wire/electricity issue.

    Could it be a humidity problem? It has rained for two weeks here, and the old country house where I'm playing is quite cold.

    I'm calling an electrician friend for check the wiring efficiency, but he doesn't have experiance with audio stuff.
    Any help will be appriciated
     
  2. hueseph

    hueseph Well-Known Member

    Hissing or humming? It's normal for a high powered amp to have some hiss. Hum is a different story. Single coil pickups? As far as humidity is concerned I think with electronics, the drier the better.
     
  3. detlef

    detlef Active Member

    hi hueseph

    No this isn't the regular hiss you can expect from a tube amp, it's way to high and sibylant, it's a continue SSSHHH.... like there was a ton of reverb turned on when there is none.
    Sometimes it became a real feedback.

    This happens in all the rooms served from the same electricity line.
    I tested the amp at home and it works perfectly.

    Yes the Fender Jazzmaster I'm using has 2 singlecoils, but this isn't a guitar issue, since I'm having the same problem with the bass on a different amp.
     
  4. eksample1

    eksample1 Member

    hiss/hum

    any thoughts on power conditioners?
     
  5. C E Barry

    C E Barry Guest

    Have you tried taking your amp and guitar to someone else's house to see if you have the same problem there? If the same thing happens (hiss) at someone else's house you'd have to take a closer look at the guitar/amp/cable/batteries.

    If you are playing close to a computer monitor you will get a noise - if you turn your guitar in certain directions the noise will get better or worse.

    I also found that you can try to ground your guitar by wearing a wire around your wrist with the other end fastened to the bridge of the guitar - just to determine if it is a grounding problem - but a grounding problem isn't usually a hiss.

    good luck,


    ceb
     
  6. detlef

    detlef Active Member

    Yes I tested amps and guitars at home (another house) and they works fine.
    Now I will try a "filtering device" on the electicity line. The electrician friend should provide one in few days.
    Let's see what's happen....
     

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