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Draining the filter caps

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  • Draining the filter caps

    I'm going to do some work on my Fender Hrdx and have decided that draining the caps is a good idea. I read somewhere to use a 25K 10W cement power resistor to accomplish this. My question, is it OK to use a epoxy coated resister instead of the cement resistor?

    '05 Gibson Les Paul Classic
    '11 Taylor 414CE
    Orange Rockerverb 50

  • #2
    Re: Draining the filter caps

    For a good reference go here.
    Half the time when I drain caps I don't even use a resistor. It is a good Idea to use one to eliminate some Pyrotechnics.


    • #3
      Re: Draining the filter caps

      It's the resistance and power-handling capability that matter. Assuming a B+ of about 450 VDC, that 25K resistor will be dissipating about 8 watts for the short time it takes to discharge the caps. So, any 25 K 10-watt resistor will do.

      You could also use a 50K 5 watt, but it will take twice as long to discharge the caps. Always make sure you check with a meter to make sure it's dead before starting work.
      Tra-la-laa, lala-la-laa!
      Rich Stevens

      "I am using you; am I amusing you?" - Martha Johnson, What People Do For Fun


      • #4
        Re: Draining the filter caps

        Be sure to take off the clips before you start the amp back up....

        Pyrotechnics to say the least. Burn baby burn!

        "You can't save everybody, everybody don't wanna be saved."