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Marshall 5205 Reverb 12 Amp, causing trouble

  • 21-04-2008 8:49pm
    #1
    TPD
    Registered Users, Registered Users 2 Posts: 7,814 ✭✭✭


    Hi guys, first time posting in this forum. As the title says, my amp is up to no good.

    When I plug in the guitar and turn it on, there is a lot of crackly noise, and sometimes a humming sound. Plucking a string produces no sound, yet resting a finger ever so slightly against a string will change the sound of the humming, making it louder.

    From looking into the back of it, there are two wires (red and black coming from the loudspeaker itself) which look to have been damaged and repaired with electrical tape. It's been like that as long as I've had it, as far as I know, and was working a few months ago.

    Anybody have any idea whats up? Thanks


Comments

  • #2
    Eoin Madsen
    Registered Users, Registered Users 2 Posts: 2,117 ✭✭✭Eoin Madsen


    Touching the string causing humming suggests a problem with the earth somewhere, maybe in the input. Have you tried a different guitar? I would rule out the speaker wiring as a possible cause anyway, from what you describe.


  • #3
    Paolo_M
    Registered Users, Registered Users 2 Posts: 880 ✭✭✭Paolo_M


    Eoin Madsen wrote: »
    Touching the string causing humming suggests a problem with the earth somewhere, maybe in the input. Have you tried a different guitar? I would rule out the speaker wiring as a possible cause anyway, from what you describe.

    +1, sounds to me more like a grounding problem and the first place I'd look is your guitar. As Eoin said have you tried another guitar?


  • #4
    TPD
    Registered Users, Registered Users 2 Posts: 7,814 ✭✭✭TPD


    Paolo_M wrote: »
    +1, sounds to me more like a grounding problem and the first place I'd look is your guitar. As Eoin said have you tried another guitar?

    I'll try the bass when I get home and let you know how I get on. Thanks


  • #5
    Don1
    Registered Users, Registered Users 2 Posts: 3,172 ✭✭✭Don1


    I thought my valve had popped the other night as I forgot to plug in the adapter for the pedals in the effects loop. I was getting buzzing and a very faint sound with the volume waaaay up. Oops! Just a thought.


  • #6
    Eoin Madsen
    Registered Users, Registered Users 2 Posts: 2,117 ✭✭✭Eoin Madsen


    TPD wrote: »
    I'll try the bass when I get home and let you know how I get on. Thanks

    I know it's a little obvious, but try a different lead as well if you haven't already. I always overlook the simple things when I'm fault finding. :) What you described sounds like a broken earth connection somewhere along the input path. The lead and the guitar jack are top of the suspects list.


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  • #7
    TPD
    Registered Users, Registered Users 2 Posts: 7,814 ✭✭✭TPD


    The bass works, but only at full volume, and seems to cut out for up to 30 seconds for no apparent reason. The guitar worked today, but only for about a minute. I dont have a spare cable to try, I'll have to ask about and borrow one. Thanks for your help.


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