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  • #1

    What are these?

    I was going through some of my parts and wanted to swap out the tone volume pot in my LP. It currently has a 250k and I wanted to put a 500k in it.
    I have 2 of these on hand. They both measure out at +\- 500k and both seem to be audio taper. But what the heck are the resistor and capacitor for?
    I have no idea what guitar they came out of and I sure don’t remember ever wiring them in...
    Can anyone tell me what they are and what they do in the circuit?


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  • #2
    Re: What are these?

    Search for "treble bleed mod".

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    • #3
      Re: What are these?

      Treble bleed. It passes some highs as you turn down the volume to compensate for the dulling effect the resistive loading has on the pickup.


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      • #4
        Re: What are these?

        Yeah, treble bleed. The resistor and cap in parallel like that is a Duncan treble bleed. If they were in series it would be the Kinman style one.
        Join me in the fight against muscular atrophy!

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        • #5
          Re: What are these?

          Funny....I have had a treble bleed mod in a few guitars over the years but I’ve never seen that setup. It was always just a capacitor and not a resistor, if I remember correctly. Or maybe just the resistor and not the cap....
          In any case....thanks guys!!

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          • #6
            Re: What are these?

            The resistor adds in a degree of regulation of the treble added. Merely the cap only is a very 'artificial' method - it almost adds in more highs than there was in the full signal meaning the tone is skewed the other way. In fact its the same as a 'bright' switch or knob in an amp.
            The downside is that almost without fail, the resistor messes with the taper of the pot. I think the series resistor, and the parallel + series resistor version of the treble bleed are versions to try and keep the taper whilst maintaining the more natural retention of highs.

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            • #7
              Re: What are these?

              Yep- I've seen three different treble bleed setups: cap only, cap & resistor in parallel, and cap & resistor in series.
              .
              "You should know better by now than to introduce science into a discussion of voodoo."
              .

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