Over gnarly pickup

Discussion in 'Luthier's Corner' started by Jeff Flegler, Aug 8, 2018.

  1. Jeff Flegler

    Jeff Flegler New Member

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    I have a Seymour Duncan in the bridge of my SG. Around 8 the pup sounds good, but when going full to 10 it gets too bright. I have 300K pot for the bridge and an .022 cap. If I back of the tone, it gets a bit better. I was thinking of putting another cap on it. Might this help? I mean like two caps as I do not have a higher value cap. And would I put these in series or parallel? I have a 500K pot for the tone. Might I change that as well? LOL, I know staying on 8 is an option, but I need more for leads.
     
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  2. cerebral gasket

    cerebral gasket Well-Known Member

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    Connect the caps in parallel to increase total capacitance which will darken the tone.
     
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  3. Jeff Flegler

    Jeff Flegler New Member

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    I tried that, helped a bit, but I ended up swapping the 500K pot for a 300K. Much better. Thanx for the quick reply.
     
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  4. cerebral gasket

    cerebral gasket Well-Known Member

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    Some of the Duncan humbuckers such as the JB (SH-4) recommend 250K pots because they can sound a bit shrill with 500K. I have always liked the stock 300K pots as they are a good middle of the road value.
     
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  5. DrBGood

    DrBGood Well-Known Member

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    Doesn't a cap affect the tone only if the pot is rolled back ? Wide open doesn't make a difference, does it ?
     
  6. Jeff Flegler

    Jeff Flegler New Member

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    Not sure on that one, but I have a .047 cap on my LP and it does make a difference in the tone. If that was the case, why do they make no load pots then? The cap must some part in the tone even at wide open. Opinions?
     
  7. cerebral gasket

    cerebral gasket Well-Known Member

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    With the tone control set to 10, the cap is still in the circuit.

    Changing the value of the cap with the tone control set to 10 will make a difference. The question is can you hear an audible difference? People are going to hear what they want to hear.
     
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  8. smitty_p

    smitty_p Well-Known Member

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    As Cerebral Gasket observed, the cap is always connected. The potentiometer (which is essentially a variable resistor) and the capacitor form what is called an “RC circuit”. Turning your tone knob only changes the “R” (resistance) value, affecting the resonant frequency of the RC circuit, thus, the tone.

    However, the capacitor is always in the circuit. The perceived effect may be small, but it potentially still affects things.
     
  9. smitty_p

    smitty_p Well-Known Member

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    This is true. I have a JB and a Jazz in my Jackson. I originally had 500k pots in the guitar. I had to change the volume to 250k, as the guitar was too harsh with the 500k pot.
     
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  10. DrBGood

    DrBGood Well-Known Member

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    So, changing a cap or a pot will haver similar effect ?
     
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  11. Jeff Flegler

    Jeff Flegler New Member

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    I am a big fan of 300K pots, especially for the bridge on my LP
     
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  12. syscokid

    syscokid Well-Known Member

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    Yes, No-Load pots completely removes itself and whatever other components that are attached to its circuit, like tone-capacitors, when the pot is maxed out.

    It's very easy to DIY a pot to a no-load:


    And... If you want to decrease the pots resistance, that's easy too:
     
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