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Check your nuts!

Discussion in 'Shock Brother's DIY Amps' started by Uncle Daddy, Jan 27, 2021.

  1. Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    Been trying to pin down an intermittent hum/buzz on my PR build. It's been totally reliable for a couple of years, but I noticed it was getting noisy. I did the usual easy checks- tightened the socket and pot nuts, new power tubes and solid state rectifier i had kicking around, and thought I'd nailed it.

    Till a few days ago, when it began to get noisy again. It was only when I went to plug it in to the wall outlet I noticed a rattle from the plug, so I popped it open and found the ground screw was totally loose. A quick tightening up, and now all is good. It's my indoor amp, and hardly ever gets unplugged which is why I'd never noticed it before, and still can't understand how it worked loose, but at least I fixed it before getting a shock!
     
    Wally, robrob, Jakedog and 1 other person like this.
  2. brookdalebill

    brookdalebill Tele Axpert Ad Free Member

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    Whew!
    Mine are intact.
     
  3. BigDaddyLH

    BigDaddyLH Tele Axpert Ad Free Member

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    Low and lazy.
     
    robrob likes this.
  4. NTC

    NTC Tele-Meister

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    Vibrations from playing loud, or even not so loud.
     
  5. Peegoo

    Peegoo Poster Extraordinaire

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    Thermal cycling is usually the cause of stuff like this...but in your case perhaps you simply neglected to tweak the ground screw all the way in when assembling the plug.

    Plugs and power cables warm up in use and cool down when switched off. A fastener that's not cinched down can back out after many expansions and contractions through thermal cycles.
     
  6. Badside

    Badside Tele-Meister

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    Keps nuts and/or Loctite!!! Especially on ground connections. I will never take a chance with this.
     
    Kevin Wolfe likes this.
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