Back to old school electronics...?

Discussion in 'Luthier's Corner' started by Daddycool, Nov 16, 2020.

  1. Daddycool

    Daddycool New Member

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    Just picked up a 2019 Gibson SG Tribute. I’m getting feedback/buzz if I’m not touching a string, as well as some crackling and pops through my amp...

    I’m considering getting rid of the Gibson board and trying my first attempt at rewiring back to old school.

    Will this fix the problems I’m encountering?

    Advice? Tips?
     
  2. plankton

    plankton Well-Known Member

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    It's hard to say. When does the crackling and pops occur? Is it when operating certain controls?

    I can't see the PCB itself causing those issues, all it's doing is the same job individual wires would do in "old school electronics". It is possible that there's a bad solder joint though.

    The hum when not touching a string is fairly common. Your body is a great antenna for picking up interference, and being in close proximity to your guitar's electronics passes that interference on to it. When you touch the stings/bridge you ground yourself and give the EMI somewhere to go.
     
    Last edited: Nov 17, 2020
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  3. papagayo

    papagayo Well-Known Member

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    Try with an other jack cable
     
  4. donepearce

    donepearce Well-Known Member

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    Crackles mean dirty contacts so clean everything with electronic contact cleaner.

    The buzz when not touching strings is lack of shielding in the cotrol cavity. Sticky copper tape is the usual answer . Cover as much of the cavity as you can, but mainly the inside of the cover plate. Solder a wire from the copper to a pot body and you are done . Just make sure the copper on the cover touches that inside the cavity.
     
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  5. Daddycool

    Daddycool New Member

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    i've tried the 2 cables I have... one seems to do it a lot less, but it's still there...
     
  6. Daddycool

    Daddycool New Member

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    Keep in mind working on this stuff is new to me... can i just spray it all over...? I bought some QD electronics cleaner at Harbor Freight...will that do the trick??
     
  7. donepearce

    donepearce Well-Known Member

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    Try to find the source of the crackles - work the pots and switch, move stuff around. Then spray whatever is noisy. Try to get the liquid inside the pots and work them back and forth before it evaporates. For the switch, wet some paper with the contact cleaner, then drag it back and forth between the contacts.
     
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  8. Go Nigel Go

    Go Nigel Go Well-Known Member

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    QD Tuner Cleaner is good stuff. It should do the trick if crud is the issue in the control cavity. I would spray it directly on the contacts and try to avoid overspray as much as possible to minimize risk of damaging finished etc. If there was a red straw taped to the can when you bought it, use it to direct the spray precisely where you want it and use only what you need. In most cases is won't hurt anything, but who wants to take unnecessary risks with the finish on their favorite instrument right? :naughty:
     
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  9. papagayo

    papagayo Well-Known Member

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    Before put chemical make a test with an other amplifier.
     
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  10. cerebral gasket

    cerebral gasket Well-Known Member

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    Not enough info to determine.

    Using the same amp...

    0. Are you using a tube amp?
    1. Does the amp buzz/crackle with nothing plugged into it?
    2. Does the amp buzz/crackle using a different instrument cable?
    3. Does the amp buzz/crackle with a different guitar plugged in?
    4. Are there any pedals connected?


    I once had a buzzing sound from my LP Junior DC. Ended up there was a bumblebee cap buzzing around inside the control cavity. After removing it, the problem no longer existed.

    [​IMG]
     
    Last edited: Nov 17, 2020
  11. Daddycool

    Daddycool New Member

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    It’s hooked up to a Boss Katana, I’ve tried my two cables... one does have more issues than the other.

    I’ve tried my other electric... zero problem with either cable...

    the amp makes no noise with nothing plugged into it.

    no pedals involved

    it makes some noise when playing... if I bump the cable... makes a lot of noise

    I tried cleaning everything out with electronics cleaner, spinning knobs when wet... light sanding on contacts in jack...
     
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  12. cerebral gasket

    cerebral gasket Well-Known Member

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    Sounds like you have narrowed the problem down to that guitar.

    With everything cleaned, reflowing solder anywhere that looks suspect could be tried.

    Feeback part sounds odd, but buzzing sounds sounds like a ground wire is not making connection in guitar.

    If you plan to gut it and replace with point to point wiring, verify the pickups DCR measures within expected range.

    When selecting each pup by itself, does buzzing still occur?

    I purchased a second hand guitar in the past where bridge pup only would buzz. Ended up being the pup itself.
     
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  13. Daddycool

    Daddycool New Member

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    Noise on both pickups... using the toggle.

    Any advice on what pots, etc to get?

    a buddy told me CTS pots, Switchcraft toggle and jack...

    I personally prefer a softer sound. He recommended switching out the 490’s for something else.
    Thoughts?
     
  14. cerebral gasket

    cerebral gasket Well-Known Member

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    I have always used CTS 500K audio taper pots as well as switchcraft output jack and switch and 0.022uF caps.

    I have a 2004 SG Special with the stock 490R / 490T combo and they sound fine to my ears. Those guitars come stock with 300K pots which will reduce some of the top end sparkle.
     
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  15. Daddycool

    Daddycool New Member

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    Good deal!

    I’ve found those on Amazon... anywhere else to get them?
    It’ll be my first attempt at soldering and wiring.... wish me luck!
    Thanks for your advice on here!
     
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  16. cerebral gasket

    cerebral gasket Well-Known Member

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    You can usually find the pots at the big box stores locally if you want them right away.

    I have ordered bridges, tuners, other parts from Amazon frequently in the past without any issues.

    Use a 40W iron and be careful to not burn the pots. Make certain the ground wire from the tailpiece has good connection to control cavity.
     
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  17. Daddycool

    Daddycool New Member

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    Since many Jack’s only have one contact to touch the tip of the cable... would bending the second one back possibly help any poor connection that may be going on?
     
  18. donepearce

    donepearce Well-Known Member

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    Poor connection usually means that the plating has been damaged and corrosion is happening. The only real fix is a new jack.
     
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  19. cerebral gasket

    cerebral gasket Well-Known Member

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    Instrument cable connector has tip and sleeve. Both need to make contact with output jack.

    Sounds like someone was using a cable with straight end connector instead of right angle connector on the SG.

    Guitars such as Flying V and SG with output jack installed on top of body always get cable with right angle connector.

    Using cable with straight end connector is more prone to flex back and forth sideways clobbering the output jack over time.
     
    Last edited: Nov 21, 2020
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  20. Daddycool

    Daddycool New Member

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    I’m using a right angle cable...

    can the jack be replaced on the Gibson board?
     
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