I recently had a problem with a Music Man HD130 amp (the one Mark Knopfler used in the early days of Dire Straits). One speaker was creating a scratchy, distorted sound, surprisingly only at very low volume while it was fine at medium or high volume. I managed to cure it with an easy trick, nothing too special or secret but nevertheless something I want to share in case someone runs into similar problems with his amp.
When I removed the speaker to have a closer look at what might be wrong with it, I immediately noticed that infamous scratchiness when moving the cone carefull with two fingers. It was worse when pushing more on particular places while it disappeared when doing so at some other spots. I quickly came to the suspect that the problem came from “standing” upright for decades (it was a 1976 amp with original speakers). The voice coil is not really a heavy part but still it has some small weight, and after years this weight can deform the cone slightly so that the voice coil scratches on one side. For the same reason you should always store speakers horizontally but who stores a combo amp or a speaker cabinet this way?
The solution was very easy and inexpensive, even without any costs at all: all I had to do was turning the speaker for 180 degrees, so that what pointed to the top became the bottom end. I did the same with the second speaker, not only to prevent similar problems with it in the future but also to make the connectors of both speakers look to the middle between the speakers again, which means I also swapped the left and the right speakers. Hopefully it will work fine for the next 41 years now 🙂
Of course this easy fix does not always work, if the cone or the voice coil is damaged only a recone job will help. But before doing so you should give it a try.
Here are just two quick pictures of what I have been spending time with lately:
This is a body of one-piece (!) flamed (!!) birch (!!!), shaped like a Schecter Dream Machine body (yes, the shape is slightly different to a Fender body, e.g. slimmer horns and cutaways) . The neck is a one-piece birds-eye neck, the neck profile is copied from a Van Nuys era Schecter neck.
The wood is not finished at all yet, not even finally sanded. I admit I just could not wait to hear this guitar so I assembled it for a true ‘preview’. 🙂
The guitar sounds very cool !!! And before you wonder why this neck has no dots on the front (Mark’s Schecter – the one that was stolen – had dots): there are a few more bodies waiting around here, of different kinds of mahogany, birch, and ash. I have not decided yet on which body this neck will end (Mark’s other Schecters were dotless).
Finally, I finished the second Telecaster-style guitar with Dream Machine brass hardware. You might remember my first build report about a Dream Machine Telecaster clone. Even back then when I started that first project, I already got the body and neck to start a similar project with these but never found the time to complete it. The idea behind the project was to assemble an affordable guitar that looks great, and – most important – sounds great and gives you the ‘Walk of Life’ Schecter Tele sound of the tapped F520T / F521T pickups and the brass bridge, in other words a guitar with high-quality brass hardware and electronics but without any parts so cheap that they might ruin the sound of the guitar. It turned out to be a really great guitar, great look, great feel & great sound. As I already have more guitars than I have room for, I put it for sale into my online shop.
The body is a really nice looking, extremely light sunburst Tele body. I have no idea how old it is exactly (I guess you can call it ‘vintage’), or who made it. It is not 100% accurate compared to the Fender specs, e.g. it is only about 90% (ca. 40 mm) of the Fender body depth (44 mm) but still it seems to be a great piece of wood without anything indicating inferior quality. The grain looks great, the tap tone is nice, and, given its age, it is completely dry tone wood. There are some dings & dongs, e.g. at the edges of the body, so it looks a bit ‘naturally relic’ed’.
I got the neck together with the body. It has a rosewood fingerboard without center dots (like Mark’s ‘Walk of Life’ Tele, although this one has little dots on one side of the fingerboard, between the two lowest bass strings). So the look is similar to a dotless Schecter but you still have something that helps to orientate. The neck even has a slight flame on the peghead.
I used a set of brass hardware that I produce myself, even the control plate is brass like on vintage Schecter Dream Machines. The pickups are two ‘Walk of Life’ pickups, clones of the original Dream Machine pickups of the early 80ies.