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  • Dull sounding Marshall amp.

    I had my tech fit a send/return loop to the rear of my Marshall JMP Mk.2 a while ago.

    After endless hours of messing about with various cabs and drivers, I came to the conclusion that the amp is at fault for the very dull sound it kicks out.

    When playing my Les Paul through the Marshall and a 2x12, it sounds like there is a thick quilt draped over the cab.

    Any ideas please?

  • #2






    Quote Originally Posted by frosty55
    View Post

    I had my tech fit a send/return loop to the rear of my Marshall JMP Mk.2 a while ago.

    After endless hours of messing about with various cabs and drivers, I came to the conclusion that the amp is at fault for the very dull sound it kicks out.

    When playing my Les Paul through the Marshall and a 2x12, it sounds like there is a thick quilt draped over the cab.

    Any ideas please?




    Has that amp had a cap job? JMP MKII is over 30 years old.. it will need that.
    VoodooAmps Hex mod Marshall JMP 1978, hand built
    Global, Midboost, Feel, Bottom, Savage/Brutal mods

    Comment


    • #3
      I've never played a full sounding jmp. They are exactly the opposite. Very very bright amplifiers. Sounds like you may have an issue
      ----------------------------------------
      1981 Gibson Les Paul Custom- Wine Red
      1971 Gibson Les Paul Goldtop
      1995 Gibson Les Paul Classic
      2010 Fender American Tele
      2011 Fender Am. Std Strat
      1984 Marshall JCM 800 2203
      1974 Marshall JMP Superlead
      Orange Rockerverb 100 MK II
      Peavey JSX
      Peavey XXX
      Line 6 Spider IV 75 (2) for the cover band
      Orange cabs
      Beer & Whiskey

      Comment


      • #4






        Quote Originally Posted by Norton666
        View Post

        I've never played a full sounding jmp. They are exactly the opposite. Very very bright amplifiers. Sounds like you may have an issue




        This!
        Great deals with: Draco Aron X 2 , Holy War, Edge of Darkness X 2, freehandarson, Chrisjd, Yo_Squig, Crank, Abstract, xnatex, Norton666, JSilverstein, Elemenope, moop, Ricky Rockhardo






        Originally Posted by madryan


        That's the problem with Marshalls... They cut right through.

        "

        B.) Bending a woman over and seeing sphincter art is pretty much a clear signal that she wants you to salt the Devil's Onion Ring.









        Originally Posted by Ron Burgandy


        Kinda how I quit drinking for a long time. That was lame so I started again

        Comment


        • #5
          perhaps he clipped the bright cap while he was in there , usually a good thing though as they can bite your head off , so was it fine before his mod ? Or did this happen over time , from normal to "dull"
          "Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more."
          Nikola Tesla

          Comment


          • #6
            Something is wrong. Marshalls are the opposite of dull.

            Comment


            • #7
              When I took the Marshall to my techie, he gave it a complete service. Including fitting a matched quad of JJEL34 Tubes, replacing the electrolytic caps and adjusting the bias. I cant remember exactly how the amp sounded when I got it back in 2005. I kept it locked away for years until deciding to give it a complete overhaul by my techie two years ago.

              Comment


              • #8
                Maybe something in the loop he added isn't quite right.

                Does the sound change if you stick a patch cord in the loop?

                Comment


                • #9
                  Sounds like the amp's got other issues. Ive never heard a "dull" Marshall.
                  Good Deals With : Facing Failure . goodhonk . benjamin801. sublimeride. River Bend. Flying Milkman. Crunchtime. MickTaylorFan. ~Abstract~
                  .

                  Comment


                  • #10






                    Quote Originally Posted by Norton666
                    View Post

                    I've never played a full sounding jmp. They are exactly the opposite. Very very bright amplifiers. Sounds like you may have an issue




                    This.
                    Gibson Les Paul Traditional
                    Warmoth Custom Soloist
                    Ibanez S370
                    Gibson SG Special
                    '77 Marshall JMP 2203
                    http://www.myspace.com/sonicimages
                    --------






                    Originally Posted by RaceU4her


                    i have 12,000+ posts at HCAF, of course im a ****************ing tone guru

                    Comment


                    • #11
                      [QUOTE=drewl;47360770]Maybe something in the loop he added isn't quite right.

                      Does the sound change if you stick a patch cord in the loop?[/QUOTE

                      Yes. I suck a patch cord in the loop and the clarity has returned !!

                      What happened there then?

                      Comment


                      • #12
                        Either one of the fx loop jacks is intermittant/dirty or not wired correctly.

                        Comment


                        • #13
                          yeah spray some cleaner on a 1/4" jack and push it in and out while cranking salt and peppers "push it" and see if the problem goes away
                          no more sig

                          Comment


                          • #14
                            Whats the best cleaner to do that with?

                            Comment


                            • #15






                              Quote Originally Posted by frosty55
                              View Post

                              Whats the best cleaner to do that with?




                              Lysol



                              any electronic cleaner will do
                              no more sig

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