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Bias a Fender HRDX

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  • Bias a Fender HRDX

    I'm about to pull the stock speaker out of my Fender HRDX and replace with a Jensen C12N. My question is should I bias the tubes after the replacement?

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

  • #2
    Re: Bias a Fender HRDX

    you do not need to rebias your amp after a speaker replacement.
    as a side note- be sure you get a speaker with the correct impedance-not sure what your amp calls for though. 8ohms I suppose, but I don't use Fenders, so I'm not sure.
    " Rock and Roll IS a contact sport!"

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    • #3
      Re: Bias a Fender HRDX

      I read that you should pull the power tubes before changing speakers. I guess this is done to keep the tubes from being accidently broken. I guess my question is should the tubes be rebiased if they have been removed and then put back in? Yes, mavar, you are right the speaker is 8 ohms.
      '05 Gibson Les Paul Classic
      '11 Taylor 414CE
      Orange Rockerverb 50

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      • #4
        Re: Bias a Fender HRDX

        Your gonna have to remove the whole chassis to change the speaker in a HRD. ( Most certainly 8 ohms) So while ya got her open might as well check the bias once you get it back together. It's pretty simple to do in a HRD if you have a DMM and some aligator clips. Need more help? Google J.Holton's
        Unofficial Hot Rod Deluxe site.
        http://www.soundclick.com/whirlwindbluesrevue

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        • #5
          Re: Bias a Fender HRDX

          You don't need to touch the bias, if you're just pulling out tubes or changing speakers. It's a good idea to put power tubes back in the same way they were, although I'm not sure THAT'S even a big deal.

          Do Hot Rod Devilles even have a bias pot? For some reason, I thought they were fixed bias.
          Originally posted by Boogie Bill
          I've got 60 guitars...but 49 trumpets is just...INSANITY! WTF!

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          • #6
            Re: Bias a Fender HRDX

            Originally posted by Gearjoneser
            Do Hot Rod Devilles even have a bias pot? For some reason, I thought they were fixed bias.
            YUP! HRD and Deville's Have a Bias trim pot, And a very covenant Bias access point. Set Your meter to DCV, Use a alligator clip to put the + probe of your meter on the bias point, Ground the negative to the chassis.TAKE PRECAUTIONS NOT TO ELECTROCUTE YOUR SELF!!! Remember your reading two tubes so 68mV is a good reference point.
            http://studentweb.eku.edu/justin_holton/bias.html
            kmcguitars
            GuitarArtologist
            Last edited by kmcguitars; 03-07-2006, 04:24 PM.
            http://www.soundclick.com/whirlwindbluesrevue

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