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  • New project, small cab from old amp box?

    I have an old Marshall MG30FX that doesn't work. The PCB where all the pots sit is fried by previous owner so the "amplifier" part of the combo is pretty much shot. It got me thinking of what I could do with the box. It is a 10" box right now, but I'm thinking I could make it into a 10" or 12" stand-alone cab. I really only need to get a new piece for the front baffle and some grill cloth, new speaker and input wiring.

    Anyone do this? Lots of home-made cab boxes out there, wondering why people haven't used old combo amp boxes instead? This one is built with pressboard so isn't the highest quality materials, but it IS a Marshall product and with a little modding could be a pretty cool little cabinet.

    Created a short video overview!

    Attached Files
    Last edited by The Dali; 04-18-2020, 06:47 AM.
    -=The Dali
    --== Unabashed Alex Lifeson Fan

    Visit My Guitar Building Blog at www.hammersandchords.com

  • #2
    Re: New project, small cab from old amp box?

    I had one of those as well
    the solid state amp part failed
    not sure what it was but not worth repairing

    curious as to what you come up with
    I have speakers both 10 and 12 for projects
    EHD
    Just here surfing Guitar Pron
    RG2EX1 w/ SD hot-rodded pickups / RG4EXFM1 w/ Carvin S22j/b + FVN middle
    SR500 / Martin 000CE-1/Epiphone Hummingbird
    Epiphone Florentine with OEM Probuckers
    Ehdwuld branded Blue semi hollow custom with JB/Jazz
    Reptile Green Gibson Custom Studio / Aqua Dean Shire semi hollow with piezo
    Carvin Belair / Laney GC80A Acoustic Amp (a gift from Guitar Player Mag)
    GNX3000 (yea I'm a modeler)

    Comment


    • #3
      Re: New project, small cab from old amp box?

      So I finished this project. Sounds pretty good but still tweaking. It was little more work than originally envisioned but not terrible. I’ll have a blog post posted soon with overview of the project.

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      Sent from my iPhone using Tapatalk
      -=The Dali
      --== Unabashed Alex Lifeson Fan

      Visit My Guitar Building Blog at www.hammersandchords.com

      Comment


      • #4
        Re: New project, small cab from old amp box?

        I went with a 10" Celestion Greenback Made in the UK. Figured I'd keep it pure Marshall tone. Was originally thinking a 12" speaker but I don't think the box is deep enough to accommodate a 12". I may build a back to the box and make it a full closed-back box, not sure yet!
        -=The Dali
        --== Unabashed Alex Lifeson Fan

        Visit My Guitar Building Blog at www.hammersandchords.com

        Comment


        • #5
          Re: New project, small cab from old amp box?

          Looks great!
          Join me in the fight against muscular atrophy!

          Originally posted by Douglas Adams
          This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movements of small green pieces of paper, which is odd because on the whole it wasn't the small green pieces of paper that were unhappy.

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          • #6
            Re: New project, small cab from old amp box?

            Nice work.

            Comment


            • #7
              Re: New project, small cab from old amp box?

              Looks very useful now!

              Maybe do a panel that could be removed for open/closed option?

              Comment


              • #8
                Re: New project, small cab from old amp box?

                Originally posted by DankStar View Post
                Looks very useful now!

                Maybe do a panel that could be removed for open/closed option?
                I probably will just make a third section for the back & re-paint them all. It was a little bit of comedy of errors - I should have just bought a new piece for the front baffle, but I was trying to build this without going to the hardware store. LOL
                -=The Dali
                --== Unabashed Alex Lifeson Fan

                Visit My Guitar Building Blog at www.hammersandchords.com

                Comment


                • #9
                  Re: New project, small cab from old amp box?

                  Here is the full blog post that outlines the process.

                  https://hammersandchords.com/buildin...extension-cab/
                  -=The Dali
                  --== Unabashed Alex Lifeson Fan

                  Visit My Guitar Building Blog at www.hammersandchords.com

                  Comment


                  • #10
                    Re: New project, small cab from old amp box?

                    Click image for larger version

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                    I had made a deal on a Carvin Bel Air amp that wasn't working. The power section PC board arced/fried. I removed the amp chassis, installed a Peavey Rockmaster in it's place and removed and replaced one of the two speakers with a JBL MI 12 inch speaker. Sounds excellent.

                    Comment


                    • #11
                      Re: New project, small cab from old amp box?

                      Originally posted by Jeffblue View Post
                      [ATTACH=CONFIG]104267[/ATTACH]
                      I had made a deal on a Carvin Bel Air amp that wasn't working. The power section PC board arced/fried. I removed the amp chassis, installed a Peavey Rockmaster in it's place and removed and replaced one of the two speakers with a JBL MI 12 inch speaker. Sounds excellent.
                      sweet
                      don't chuck that old Belair chassis
                      I have one and the company doesnt do repairs anymore
                      I may need parts

                      what would you charge for the chassis?
                      EHD
                      Just here surfing Guitar Pron
                      RG2EX1 w/ SD hot-rodded pickups / RG4EXFM1 w/ Carvin S22j/b + FVN middle
                      SR500 / Martin 000CE-1/Epiphone Hummingbird
                      Epiphone Florentine with OEM Probuckers
                      Ehdwuld branded Blue semi hollow custom with JB/Jazz
                      Reptile Green Gibson Custom Studio / Aqua Dean Shire semi hollow with piezo
                      Carvin Belair / Laney GC80A Acoustic Amp (a gift from Guitar Player Mag)
                      GNX3000 (yea I'm a modeler)

                      Comment


                      • #12
                        Re: New project, small cab from old amp box?

                        Originally posted by ehdwuld View Post
                        sweet
                        don't chuck that old Belair chassis
                        I have one and the company doesnt do repairs anymore
                        I may need parts

                        what would you charge for the chassis?
                        I had started to convert the Bel Air chassis to octal sockets and hard wired for a quad of 6V6 tubes. Of course, it is a little more complicated than just switching the tube types. I haven't found the correct resistor values to dial in close to a proper bias point. I punched the chassis for the tube sockets for a partial point-to-point wiring. If I can get back to this project, I believe it will sound amazing and more Fender-like.

                        Comment


                        • #13
                          Re: New project, small cab from old amp box?

                          I love mine
                          it sounds fine stock to me

                          but I am curious as to how it turns out

                          I have read of some Hasserl Mods and was reading up on those last week
                          but seems like you have a more ambitious mod in mind
                          EHD
                          Just here surfing Guitar Pron
                          RG2EX1 w/ SD hot-rodded pickups / RG4EXFM1 w/ Carvin S22j/b + FVN middle
                          SR500 / Martin 000CE-1/Epiphone Hummingbird
                          Epiphone Florentine with OEM Probuckers
                          Ehdwuld branded Blue semi hollow custom with JB/Jazz
                          Reptile Green Gibson Custom Studio / Aqua Dean Shire semi hollow with piezo
                          Carvin Belair / Laney GC80A Acoustic Amp (a gift from Guitar Player Mag)
                          GNX3000 (yea I'm a modeler)

                          Comment


                          • #14
                            Re: New project, small cab from old amp box?

                            I don't really care for EL84 tubes in an amp, but that's just me. It is a huge undertaking and not entirely positive I can pull this off. This project has been sitting around for years and I keep getting distracted by other projects, especially when I haven't resolved the issues. Hopefully I can do this. I also have a Mojotone Studio One amp kit that is nearly finished but has a huge decreased volume issue that I cannot seem to rectify. I have to get that project going again.
                            Last edited by Jeffblue; 04-17-2020, 09:32 AM.

                            Comment


                            • #15
                              Re: New project, small cab from old amp box?

                              Good stuff. Nice to be able to re-use this stuff.
                              -=The Dali
                              --== Unabashed Alex Lifeson Fan

                              Visit My Guitar Building Blog at www.hammersandchords.com

                              Comment

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