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Acoustic B100 making a distorted crackling noise

Discussion in 'Amps and Cabs [BG]' started by AdamK, Dec 2, 2016.


  1. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    That's the best description I can give. For a while now my amp will occasionally make a distorted/crackling noise on notes that seem to be primarily low ones. Was wondering what might be broken here and if it's fixable. The only thing I have against bringing it to a tech is not being able to see what went wrong and how to fix it. I'm very curious being an aspiring electrical engineer. Not sure if I'm up for the challenge of fixing it unless it's pretty simple.

    Thanks
     
  2. anderbass

    anderbass

    Dec 20, 2005
    Phoenix. Az.
    A super easy test you could try: is to simply plug a guitar cord in between your effects send & return jacks. If this instantly fixes the problem, you could choose to simply leave a short cord in place, or you could clean the switching contacts in your effects return jack that was causing the problem. (Research the term: "dirty effects-return jack" for more info, you'll discover its a fairly common problem in most all brands of bass amps)
     
  3. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    Ah of course! I did this earlier but never thought to listen for it. Of course I wouldn't hear it while the effects were active so I'd need to turn them off. Thanks for the advice! It did sound like a fairly common problem.
     
  4. BassmanPaul

    BassmanPaul Inactive

    Did it help with your problem??
     
  5. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    Haven't tried yet. Been super busy. I should've done it when I had to record something yesterday for homework. I may try when I get a few minutes tonight.
     
  6. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    So I just tried it out, going through the pedal and not going through it, and it wasn't making the sound. I'm sure it will happen when I start playing some other time. I'll also make sure to monitor whether or not I have anything else powered on that is in the vicinity in case it's a voltage problem (doubt it).
     
  7. BassmanPaul

    BassmanPaul Inactive

    Or a Cell phone sitting on top of the amp! :D
     
  8. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    Oh boy... you know me too well. Is this true??
     
  9. BassmanPaul

    BassmanPaul Inactive

    Yes!
     
  10. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    Ok the cell phone was not it...
     
  11. catcauphonic

    catcauphonic High Freak of the Low Frequencies Supporting Member

    Mar 30, 2012
    Seattle WA
    Interesting. This has just started happening with our lead guitarists Fender Reverb Twin, though it's happening more on his higher notes, i believe. @anderbass, do you recommend trying this in his case as well?

    Interesting!
     
  12. anderbass

    anderbass

    Dec 20, 2005
    Phoenix. Az.
    I don't think any of the Twin Reverb models came with effects jacks, but yeah give it a try if his has them.
     
  13. Plucker Tom

    Plucker Tom

    Dec 29, 2014
    Philly
    Could be some inner bracing rattling around..?? just a thought..
     
  14. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    Not all. It's definitely distortion going on in the electronics. It's really off and on though. Like I just went through a lengthy jam sesh without it happening. But I'm sure tomorrow it'll act up again.
     
  15. I've had a couple of the spade connex at the speaker get too loose and make some serious bad noise. The male is actually a bad fit to the female - which is larger and sloppy.

    Replace them with automotive spades (female) in the RED sleeve size. The BLUE ones are also too big.

    Standard audio spades don't seem to work - so I go straight to the automotive versions first.

    The speaker has to come out after the grill gets removed.....the grill has four Velcro pads at the corners. This too ---- the piping comes with the grill - so don't try to separate them.

    I use a cake frosting spatula to get it apart - it's super flexible and very thin and springy.

    The speaker is held in place with Phillips head screws and there were compressible composition washers under the screw heads.

    On the off-chance that the spades are loose inside the amp/head - you have to pull the head out of the cab. Be careful that you pay attention to the length of the wires from the rear of the amp, that go through the floor of the head compartment, and go to the driver (speaker). It isn't very long - so watch it!
     
  16. blubass

    blubass

    Aug 3, 2007
    Modesto Ca
    Current: Blackstar, DR strings, Nady. Previous endorsements with: GK, Rotosound, Ernie Ball, Cleartone, EMG, Dean, Dava Picks, Rebel Straps, Dickies
    At what volume is the amp causing this noise? It is only a 100 watt amp.
     
  17. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    I'm using less than 50W. Hasn't happened in a while though.
     
  18. That's just avoiding the possible truth. The fact that it only happens at higher output doesn't mean it's OK to leave it this way.

    Open up and see if there's a problem with the connections or not. If there is a lot resistance because of weak connex, thankfully a solid state amp can intermittantly "see" an open circuit and for quite a long time it won't have any immediate damage.

    Just my advice to keep your nether follicles from future immolation.
     
  19. AdamK

    AdamK

    Jan 24, 2015
    Virginia
    I didn't say it only happened at higher output. Anyway, it hasn't happened in a long time. It could have been the electronics of my Bose speaker sitting on top of it.
     
  20. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    Apr 18, 2021

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