NOAD

shaunf · 2011-11-08T14:10:15+00:00

Yep, New Old Amp Day for me. Acquired this old rocker over the weekend from another forum member: It's a Marshall JMP 50. Some Googling of the serial number puts it as a 1969/1970 model. Definitely far from perfect, but that's what intrigued me about it. It's been recovered at some point in its life - BADLY. There is some evidence of some work being done on the insides, the extent of which I am not 100% sure. Some of the pots are scratchy etc. But besides that, it's in working condition and it sounds AWESOME and to me, worth giving some TLC and trying to get it back as close to original specs, aesthetically and electronically as possible/practical. The head has already been affectionately christened "Bad Boy Boogie", or TripleB for short. ? He came with another old friend: I bet this cab has a story to tell. It's been through the wars. Once again, it's also been recovered badly at some point, and needs a whole lot of work. It's slightly wider than my new 1960A cabinet, you can make out routed piping channels under the tolex/vinyl/whatever its covered in on the top. The grill cloth seems to have been painted black, and if you open the cab you can make out from the edges that the grill cloth used to be an off-white/creamy sort of colour. Not sure if it is original, but the cloth also seems to have a strange sort of weave pattern to it. Here she is with the back open: All 4 speakers are Celestion Greenbacks. The bottom right speaker has lost its green magnet cover thingy at some point. 3 of the 4 speakers have the following model number and date code on them: Model T1281 Date Code 04FA Google tells me these are Celestion G12H speakers, and they date back to 4 June 1968. The bottom left speaker is different. It's a G12M according to the T1221 model code, and the BN6 code dates it to 6 Feb 1980. When I plugged in a speaker cable to the cab and measured it's impedance, I got a figure of 3.9ohm. That would suggest that all 4 speakers are 16ohm, and all wired in parallel, rather than the 2xseries and the 2 series sets in parallel as my 1960a cab is wired. Would there be any problem wiring the old cab in the same way to make it a 16ohm cabinet? Busy preparing an extensive grocery list of items that marks the start of a long term project to restore both the amp and cabinet to their former glory.

shaunf

Reinhard wrote When you remove the tolex, keep the old tolex as a template to cut the new tolex.

Congrats on the old girl! Looking forward to see it restored to former glory.

Thanks for the tip! I fear I am going to have some difficulty getting the stuff on the cab off intact. It feels stiff and brittle.

shaunf

Vic wrote
Congrats Shaun....wow ! What a find ! Good luck with the restoration....and keep us posted OK ?

Thanks Vic, will do. I don't have much spare time between work and a very young family, so I'm expecting this to be a fairly lengthy project, but I'm in no rush to get it finished.

nick

shaunf wrote
nick wrote
Any way I can get in on it? I need an indicator lamp for my plexi, one or two replacement marshall vol knobs and some grille cloth to redo my 2x12.
Hi Nick,

Sorry I only saw this now. I actually by chance ended up piggybacking on someone else's order, on the condition that I sent my order through to him this afternoon, so I fear he has already placed the order. Sorry man!

Let me know if you have any grille cloth left ?

shaunf

nick wrote
Let me know if you have any grille cloth left ?

I will definitely have some left. I'm buying 1 yard of Original Marshal Salt and Pepper and 1 yard of the Checked one and will only decide what I'm going to use when they get here. Leaning towards the Checked one, but who knows...

nick

shaunf wrote
nick wrote
Let me know if you have any grille cloth left ?
I will definitely have some left. I'm buying 1 yard of Original Marshal Salt and Pepper and 1 yard of the Checked one and will only decide what I'm going to use when they get here. Leaning towards the Checked one, but who knows...

Im looking for salt and pepper, want it to look like:

http://www.thegearpage.net/board/showthread.php?t=446688 8)

guitarboy2828

shaunf wrote
Donovan Banks wrote Looks like your input jacks were replaced with Stereo instead of mono.

great amp, so is there gonna be an AFD 100 up for sale one of these days? ?
LOL! The AFD will be buried in the same hole as me! ?

Hmmm... Which hole we thinking of particularly? and what is the ETA of this amp going in there with you? I may need to practice my grave diggin' skills ?

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