Crackle/buzz in the low register in my Fender Frontman 25

Discussion in 'Amp Central Station' started by Deaf Eddie, May 29, 2020.

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  1. Deaf Eddie

    Deaf Eddie Friend of Leo's

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    It's an oldie but a goodie, and I love this amp.

    Lately, it's developed a crackle when I play the low E string. It's not the reverb, it's not the
    speaker - I've swapped parts and tested for that. The crackle stays with the amp. Everything else seems OK.

    I'm no kind of a techie as far as amps go, but I did replace the (dead) input jack in this one, years ago. I'm a-wishing and hoping this is a common issue with a simple fix... Any ideas?
     
  2. dan40

    dan40 Tele-Afflicted

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    It's likely a bad solder joint. The lower notes cause more vibration in the cab and chassis which causes the intermittent connection. Very easy to fix but finding it can be the hard part. Some gentle prodding of all components and wiring with a wooden chopstick may help to find the culprit. You will need to have the amp powered up and plugged into the speaker when troubleshooting so only do so of you know how to safely work inside a live chassis. Be sure to check the speaker connections also as they may have become loose over time.
     
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  3. urbandefault

    urbandefault Tele-Holic

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    Is it an electrical crackle or a mechanical rattle?

    Mine had a rattle around the speaker baffle. I stuffed some foam in the gaps and cured it.
     
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  4. Deaf Eddie

    Deaf Eddie Friend of Leo's

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    Got to be electric. Tried a different speaker and it was still there.
     
  5. trxx

    trxx Tele-Afflicted

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    Did you try a speaker outside of the amp's cab?
     
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  6. Deaf Eddie

    Deaf Eddie Friend of Leo's

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    Yes, as I said in the original post and my last reply. It's not the speaker or the baffle.
     
  7. Tim S

    Tim S Tele-Holic

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    As trxx pointed out, you need to try a speaker that is physically outside of the combo cabinet to rule out vibrations affecting a cold solder joint (as mentioned by dan40)

    Is that what you did? It wasn’t explicated stated.
     
  8. Deaf Eddie

    Deaf Eddie Friend of Leo's

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    That's what I did... It's not a vibration issue. Gotta be a bad cap or some such.
     
  9. glenlivet

    glenlivet Tele-Holic

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    my 2 cents...
    as others have said....probably a bad solder joint. Probably one of the pads for the front controls...
    first thing to check:
    1) can you produce the noise any other way (try wiggling ALL pot controls, not just turning them, but give them a little shake).
    2) turn all controls to zero / then up to 10 (each one) to see if you can narrow down where the problem is.... (ie : does the noise have reverb on it ?) does it go away when the gain channel is pushed in...etc...
    3) The Frontman circuit is pretty simple....but.....you really want to try and narrow down where / what /how the problem occurs.
     

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  10. Switchy

    Switchy Tele-Afflicted

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    It's probably one of the pots that needs a simple cleaning with electronics spray.
    Other than that, it could be any connection in your chain that is less than perfect.

    Yes, possibly it can be one of the caps, but in this amp, good luck if it's not visually obvious.
    I can recommend a really cheap ESR meter which will make things a little easier:

    https://www.amazon.com/gp/product/B00AF1UF2M/?tag=tdpri-20
     
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