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Dull sounding Marshall amp.

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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.
    <div class="signaturecontainer"><font size="1">VoodooAmps Hex mod Marshall JMP 1978, hand built<br />
    Global, Midboost, Feel, Bottom, Savage/Brutal mods</font></div>

    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
      <div class="signaturecontainer">----------------------------------------<br />
      1981 Gibson Les Paul Custom- Wine Red<br />
      1971 Gibson Les Paul Goldtop<br />
      1995 Gibson Les Paul Classic<br />
      2010 Fender American Tele<br />
      2011 Fender Am. Std Strat<br />
      1984 Marshall JCM 800 2203<br />
      1974 Marshall JMP Superlead<br />
      Orange Rockerverb 100 MK II<br />
      Peavey JSX<br />
      Peavey XXX<br />
      Line 6 Spider IV 75 (2) for the cover band<br />
      Orange cabs<br />
      Beer &amp; Whiskey</div>

      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!
        <div class="signaturecontainer">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<br />
        <div class="bbcode_container">
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        <div class="bbcode_postedby">
        <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>madryan</strong>
        <a href="showthread.php?p=46210490#post46210490" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
        </div>
        <div class="message">That's the problem with Marshalls... They cut right through.<br />
        <br />
        &quot;<br />
        <br />
        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.</div>

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        <div class="bbcode_postedby">
        <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Ron Burgandy</strong>
        <a href="showthread.php?p=47334903#post47334903" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
        </div>
        <div class="message"> Kinda how I quit drinking for a long time. That was lame so I started again</div>

        </div>
        </div>
        </div> </div>

        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"
          <div class="signaturecontainer"><font size="2"><br />
          <br />
          &quot;Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.&quot;<br />
          Nikola Tesla</font></div>

          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.
                  <div class="signaturecontainer"><b>Good Deals With</b> <font color="red">: Facing Failure . goodhonk . benjamin801. sublimeride. River Bend. Flying Milkman. Crunchtime. MickTaylorFan. ~Abstract~ <br />
                  . </font></div>

                  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.
                    <div class="signaturecontainer"><font size="1">Gibson Les Paul Traditional<br />
                    Warmoth Custom Soloist<br />
                    Ibanez S370 <br />
                    Gibson SG Special<br />
                    '77 Marshall JMP 2203<br />
                    <a href="http://www.myspace.com/sonicimages" target="_blank">http://www.myspace.com/sonicimages</a><br />
                    -------- <br />
                    <div class="bbcode_container">
                    <div class="bbcode_quote">
                    <div class="quote_container">
                    <div class="bbcode_quote_container"></div>

                    <div class="bbcode_postedby">
                    <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>RaceU4her</strong>
                    <a href="showthread.php?p=41701992#post41701992" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
                    </div>
                    <div class="message"><font size="1">i have 12,000+ posts at HCAF, of course im a ****************ing tone guru</font></div>

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                    </div>
                    </div> </font></div>

                    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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