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PreAmp Hum

Discussion in 'Preamps / Channel Strips' started by unplugged_unsigned, Sep 27, 2009.

  1. Ok so I bought 2 cheap little Art Media Tube Pre's for about 30 bucks a piece. I had read some suprising reviews about how they were actually pretty good expecially for the price. So a little curious I bought 2.

    I actually use mine to warm up my vocals at my live show and the sound is actually very nice and warm.

    The problem is that on of the pre's has a pretty loud hum. Will changing to a higher quality tube remove the hum?
  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Don't these use a "wall wart" power supply? Try swapping those around to see if that narrows it down. Usually power tubes can cause hum, not preamp tubes. My bet is a bad ground or a filter cap issue.
  3. I've tried different ac adapters and different plugs at different venues. Still the one still has a hum. I guess the next step to be to get one of those little single plug ac power cleaners from guitar center.

    Hopefully that will help.
  4. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Probably won't help this. Being that the internal guts have to have additional power supply conditioning to rectify the wall wart's juice for the tube circuit, my bet is a bad capacitor in that section.
    Good luck!
  5. jg49

    jg49 Well-Known Member

    Any chance it is still warranteed? In the end they are only thirty bucks so it is a big chance to replace the tube at 33% of the total cost and not have it work because it is in fact a capacitor.
  6. Yea it should be under warranty still. I'll have to get my paper work on it out.

    I'll just see if they can send me another one....For the price of the one that works I am really impressed with how they warm up my vocals through my PA.
  7. AEX-Labs

    AEX-Labs Active Member

    maybe a ground loop?

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