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Making Your Amp YOURS (D.I.Y Part 2)
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| Print article | This entry was posted by 06AngusSG on February 28, 2011 at 11:44 pm, and is filed under Gear Tutorials, Premium, Tutorials. Follow any responses to this post through RSS 2.0. You can leave a response or trackback from your own site. |
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The Big Speaker Shootout
about 11 months ago - 40 comments
Hi my rockin’ friend. Sorry, you have to register to see me do this one! If you have already registered, please login. Cheers, SD
AC/DC – Love Hungry Man (tone sample and settings)
about 1 year ago - 51 comments
Hi, First of all, I’d like to introduce myself since this is my first post here on solodallas.net as a contributor. My name is Adam, I’m 18, and I’m a huge classic rock fan and player from Hungary. I’ve been playing for quite a few years now, and I plan to do this for a Read more >
Making Your Amp YOURS (D.I.Y. Part 1)
about 2 years ago - 35 comments
Hi my rockin’ friend. Sorry, you have to register to see me do this one! If you have already registered, please login. Cheers, SD
Saving...
about 2 years ago
Since we are talking about D.I.Y how is your take on Ceriatone?
I was thinking of soldering together a head from there for a school project work.
about 2 years ago
Good stuff. It’s far better sounding than marshall ri’s or so. But you can upgrade them best with sozo caps and decent tranny’s like Mercury magn. or heyboers..
about 2 years ago
But I dont really get one thing. Are they assembled when bought or is it soldreing for myself? I want to solder because of my assignement. I dont really know what they with assembled.
about 2 years ago
The turret board comes assembled ( for no extra cost.. ). You can still decide to build them by yourself, but I should not know why you would do that. All of the remaining you need to assamble by yourself, mount the pots on the chassis, install and wire the tube socets, etc.
about 2 years ago
its for a schoolproject, but I guess I will scratch that::) I might buy one of those amps some day tough:) very good prices
about 2 years ago
I really don’t know much about them. (Ceriatone)
One day I do plan to buy the parts for re-wiring my amp.
Mine is a 1993 Re-issue so it has a new style board.
The plan is to do a turret point to point with the old style components.
about 2 years ago
http://www.ceriatone.com/productSubPages/BSPlexi50Lead/BSPlexi50.htm
Would be a nice upgrade. For about a 100dollars, maybe upgrade with sozo’s.
about 2 years ago
That does look like a nice kit. $100 is completely out of the question right now.
I am planning to buy a similar (un-assembled) kit from Mojo.
The problem with mine, so to speak, is that I had it modified by David Bray. I’ll have to compare some of the component values and routing with the new kit vs what is in mine so I don’t screw up my mods.
But it’s way down the road for now. I won’t say I’m unhappy in any way with my amp. I just like to modify and tinker.
about 2 years ago
Would love to see your amps board ( the mods ).
about 2 years ago
No can do.
Very sorry for this one. David has been the victim of design theft before. Not to say you will but I, along with probably most of his faithful customers, agreed not to post pics. of his mods on any kind of a website.
I would hate to go back on that.
Hope you can understand.
about 2 years ago
are these mojoamps preassembled or can I put them toghether by myself?:)
about 2 years ago
Here’s a link to their page for kits. The pics show them assembled but all of their kits are D.I.Y.
The nice thing about them is they have different kit levels ranging from just the small parts up to a complete amp.
http://www.mojotone.com/amp-parts/amp-kits
about 2 years ago
Nice! Good prices too!:D The 18w head looked gorgeous. Even tough the knobs looks more fender ( easy change ). The only thing now I need is studying. Does schedules come with the amps?
about 2 years ago
Schedules?
Sorry, if you’re meaning diagrams, then yes. Their paper catalog says that schematics are included but no step by step instructions. 
about 2 years ago
Sorry, I made a translation directly from swedish to english:) I now some basics about soldering but is there somekind of litterature or instructions for making ampcircuits in general?
about 2 years ago
No worries man.
I got the point.
I don’t know what to lead you to directly. The best I can say is search in places like the Marshall Amp forum, or others. I’m sure there’s a wealth of stuff like that on the internet.
about 2 years ago
ok thanks:)
about 2 years ago
O yes ! Sorry.. Very understandable. It would not be very fair against David. How did the mod actually changed the amp’s sound?
about 2 years ago
Wasn’t so much in the sound as it is being more user friendly.
Added was a master vol/attenuator, both vol controls are now push/pull knobs for different gain amounts, and he did do some sound tayloring. Mostly he shaped the sound for classic rock but it does still do well for up to Metallica-ish stuff (pedal driven.) What I asked him for was the “Solodallas” mod package. These are the same as Fil’s 1987xl
I don’t have a before and after comparison because this is my first tube amp and I bought it used from a Guitar Center in another state and had it shipped straight to David.
about 2 years ago
Yet again,fantastic man.
You get an A+++++++
lol
about 2 years ago
You are as skilled as anyone at this, a real pro job. Thanks for sharing your knowledge and experience
about 2 years ago
Great article!
I have a cabinet that I built for myself. It’s basically a copy of a marshall 2061CX cab (same sizes), and it has two greenbacks. Nice little cab
about 2 years ago
Great work, 06AngusSG! On the article and on the project itself. You also told some tricks
I already thought that the corners are the hardest thing here, and I also assumed that the corner bumpers will cover some “accidents”, hehe 
Man, you make me want to order some tolex and doing a recover of my jmp
about 2 years ago
Thank you again Franz!
JMP’s already have the corners don’t they?
That makes the job so much easier!
If so, do it man.
If you look at those sites I linked, there is all sorts of color or pattern options for tolex. Something for everyone.
Jon
about 2 years ago
Yes, they have. Mine is not only pretty beaten up but there’s also a band logo sprayed on the right side of the amp, “one hundred men”, seems to be a british band that used this amp in the past.
I’ll look out for a european shop and keep this in mind for my next holiday project
about 2 years ago
Both articles are GREAT, 06AngusSG, very informative.. I really enjoy this kind of posts.. I like that your knowledge coexists with your constractive skill..
My JMP is a combo and now after buying a 4×12 it needs to be converted to a head. Unfortunately there is no european shop to make a JMP copy (1976-1981) period.. So there is a problem for me how to get the proper headshell.. I thought that a good idea is to buy a marshall 1936 and covert it to a head but I think that there is to much hassle.. any ideas are welcome..
about 2 years ago
Hello George, maybe you can build yourself such a head case? I could give you the exact measurements from my JMP head, Tolex and the corner bumpers probably too can be found here: http://www.tube-town.net/ttstore/index.php/cat/c119_Tolex.html “Big T” Thomann ( http://www.thomann.de/gr ) also have corner bumpers and marshall amp foots. Would be a nice project
about 2 years ago
Thanks Banane but it is not that easy to make an exact replica of the JMP head shell.. After long search, again, lol, the only reasonable thing is to order either this
http://www.tube-town.net/ttstore/product_info.php/info/p4624_TTC-Lemberg-SmallHead.html
or this
http://www.tube-town.net/ttstore/product_info.php/info/p4539_TTC-Lemberg-Headshell-Custom.html
As for tolex the cheapest is solsound (xbay).
…and then make a whole alot of work to make them look like a exact replica with the help of a luthier..
Again I say that it is too much hassle..
about 2 years ago
Hm, found another one there: http://www.tube-town.net/ttstore/product_info.php/language/en/info/p1746_TTC-Amp-Chassis-Marshall-SmallHead-Standard—CUSTOM.html
Can be ordered with black tolex too.
about 2 years ago
It looks similar but it is not the same, different corners , different dimensions, no lip in the bottom side, the four sides are built in respect of the older JMP design which are thinner than the later JMP..
about 2 years ago
Thats right, it’s only similar. But then your only solution is to buy either an empty original JMP shell or rebuilding one yourself
I would go for building one, it’s a cool project and maybe easier to do than you believe 
about 2 years ago
To find an original JMP shell is almost impossible, to buy an exact copy from USA manufacturer will be expensive, so the alternative is to build by your self..
I wish that you are right and it is easier than I think
about 2 years ago
It really is. You just need to connect 6 birch plywood boards together, round their edges and cover them with tolex
Sounds a bit arrogant maybe, but I would provide assistance, and also drawings, and surely 06AngusSG will do so too 
You just need a drilling machine, a router or a rasp and sanding paper for the roundings, some screw clamps and the material. Do you have a place for working on it?
about 2 years ago
Lol…while looking for the tolex I found some checkerboard basketweave cloth for marshall cabs. Now I know what my next project is
about 2 years ago
Another option: go to a local carpentry and let them build the shell. Building just the shell would take them maybe 3 hours there, I guess.
about 2 years ago
No, it will take a considerable amount of time to build it., it not that easy.. But I will search for a good local carpentry to ask.
about 2 years ago
Alright, good luck
Hope, they aren’t expensive.
about 2 years ago
Thanx for the kind words SGACE. I read through your conversation with Franz. Building the box really is easier than you might think. But hesitation is very understandable.
As far as findind a manufactured replica box. Are you in the US? Or are you in Europe/ Elsewhere. I would have to look but I think that there’s some manufactures here in the US that make JMP.
If you end up taking on the task I’m more than willing to help in any way I can.
about 2 years ago
Add me here
about 2 years ago
I guess I forgot to ask a couple of important ?’s.
Which JMP do you have? 2204, 2204, 1959, 1987??
Is the box in the linked picture below the type you’re looking to buy/build?
http://www.ultimate-guitar.com/reviews/images/images_list_18_117_29855_1.jpg
If so difficulty level is minimal. It took me about a Saturday and half of a Sunday to build mine. This one would be about the same to do. About $75-$100 in material here in the US to build the wood part.
about 2 years ago
Me and Franz, we live in Europe.. If I were in US the easy solution would be to buy a cab from sourmash.. Anyway my amp as I said is a combo of JMP 2104 ( 2204 head)..
Some of my questions is how to make the lip in the bottom front side, and how to make fatter the right and left front vertical sides .?
I have bought recently a JCM900 so I hope that I have right the outer and inner dimensions etc,..
about 2 years ago
Oh I forgot, yes 06AngusSG, the headshell in the link’s photo is what I am after..
about 2 years ago
For the thicker sides, it seems that they put wood bars at the left and right side plates and screwed the front panel from the back on, so the thickness of the wood bars is added to the thickness of the plywood side plates.
I’ll take photos from inside my JMP tomorrow.
about 2 years ago
Franz seems correct here.
You would build a similar outter box to mine (dimensions differing of course) then add the extra layer to each side, in the front only, to get the thicker look.
???Lip in the bottom front???
about 2 years ago
yes, in the bottom side the older JMP designs like the one that you built had no front lip, there were flat (straight) but on the later design and afterward JCM 800, 900 etc, they added a lip in the base of the bottom side.. check amp archives.com…great library..
about 2 years ago
Older JMP, no lip
http://amparchives.com/album/Marshall/50%20Watt%20Series%201966-1981/1986%20or%201987%2050W/68%20JMP%2050W%20SN%20S10702/marshalljmp50044iz3_jpg_orig.html
Later JMP with lip
http://amparchives.com/album/Marshall/50%20Watt%20Series%201966-1981/2204%20Master%20Volume%2050W/76%202204%20JMP%20Master%20Volume%2050W%20SN%20SA4522H/!Bb5vCFwBGk~$%28KGrHqUOKj0Eq5HNvwP+BKyMt!hf4Q~~_3_jpg_orig.html
about 2 years ago
Sorry, George, maybe I’m blind, but I still don’t get what you mean. Maybe you can describe it a bit more in detail?
about 2 years ago
O.K. I think I see. The lip looks, to me, to be very shallow. Maybe 1/8″ to 1/4″ at most. I think this would be done the same as the sides. Just add the correct amount of xtra material to the inside of the plain outer box.
I will try to look at one in person soon. I think I could get a better perspective.
about 2 years ago
Ok, after looking at my own JMP (like the 2nd image) I think I know what you mean.
I’ll take some detailed images from inside the JMP tomorrow.
about 2 years ago
Here we go.
These pics are of the new Slash sig. Marshall. It looks to be based off ofhe later JMP box.
See Here: http://www.flickr.com/photos/55720588@N03/5492296965/
The next two show it uncovered. Here see the dark strip in the front (green arrow.
http://www.flickr.com/photos/55720588@N03/5492296951/in/photostream/
I believe that to be the “adder” for the front lip.
And here you can kind of see the doubled up sides.
http://www.flickr.com/photos/55720588@N03/5492296959/in/photostream/
Hope this helps
about 2 years ago
Yes, as far as I know its based on a later JMP or a JCM800.
Or with a sanding machine.
Yeah, they just put another stripe of the same birch plywood. Just as we thought 
Alright, now I got it. The lip looks like a flat rounding, right? Could also be done with rasp, file and sanding then
Yes, “doubled up” was the team i was searching for earlier. Too long out of the carpenter business now
about 2 years ago
Yes, that is what I am talking about.. in marshall forums they call it a “lip” so it was kind of difficult to explain it with different words.. So … how can we do it??? LOL
about 2 years ago
The lip is a rounded kind of wood profile at the edge of the bottom side of the shell. Only from the later JMP’s and forward (JCM800,900, etc) it exist.. It is where the metal chassis (front panel) stops.. the older had a flat profile and the later a rounded one..
about 2 years ago
I’m not totally sure on how to do it. Like I said earlier. I really want to look at one on person. I think I could visualize how they do it better if I could actually see it. As soon as I get a look on one I’ll let you know.
about 2 years ago
Shot some photos from inside the JMP and also some details from the lip. It’s really a shallow rounding.
They doubled up the sides in the front and in the back side of the side plates, the front edges gets rounded then and at the back it builds a spigot (don’t know if it’s the right word here) for the back panel.
Simple, really no rocket science.
about 2 years ago
Man, I’m tired… here’s the pictures: http://www.banane.at/media/Marshall-Amp/?C=M;O=D
The older ones are from unpacking it after it arrives here
about 2 years ago
Thanks for the pics, really old power tubes are in there..
about 2 years ago
Anytime, George. Yeah, you told me last year that they were General Electrics 6550′s, do you remember?
I ordered then a complete new set of TAD tubes, as a replacement and got it retubed in January.