1971 JMP 50 Smallbox

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1971 JMP 50 Smallbox

Postby gigant0r on Sat Oct 17, 2009 7:32 pm

Hello again :D

I've got a chance to buy this little gem and here's the pictures that seller provided:

http://www.vault66.org/marshall/01.jpg
http://www.vault66.org/marshall/02.jpg
http://www.vault66.org/marshall/03.jpg
http://www.vault66.org/marshall/04.jpg
http://www.vault66.org/marshall/05.jpg
http://www.vault66.org/marshall/06.jpg

I didn't get inside pictures but I'll ask him about 'em. Do you see anything strange with it? I hope that those trannies are original..

Thanks :cheers:
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Re: 1971 JMP 50 Smallbox

Postby LD50 on Sat Oct 17, 2009 7:39 pm

OT looks like a replacement, are there any board pics/of selectors etc?
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Re: 1971 JMP 50 Smallbox

Postby gigant0r on Sat Oct 17, 2009 7:43 pm

That's all the pictures I have.. I've asked him about pictures of the guts.. I'll post 'em when I got 'em

btw, does anyone have any pictures of similar amp so I can compare them?
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Re: 1971 JMP 50 Smallbox

Postby PeeCee on Sat Oct 17, 2009 10:25 pm

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Re: 1971 JMP 50 Smallbox

Postby Gaetano on Sat Oct 17, 2009 11:27 pm

Ot is a replacement FWISee
Bring your fair maidens out, for the vikings are coming to pillage. (Robert Plant)

'71 SB to SL
'82 1960a - G12-65
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Re: 1971 JMP 50 Smallbox

Postby gigant0r on Sun Oct 18, 2009 7:39 am

Alright, thanks for the link :thumbsup:

While I'm waiting for the pictures, what do you think about this deal? '71 JMP 50 + 4x12" cabinet for 2000eur. Is it worth it even if the OT is replacement?

here's the pictures of the cab:

http://www.vault66.org/marshall/07.jpg
http://www.vault66.org/marshall/08.jpg
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Re: 1971 JMP 50 Smallbox

Postby gigant0r on Sun Oct 18, 2009 10:33 am

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Re: 1971 JMP 50 Smallbox

Postby BIG Dave on Sun Oct 18, 2009 1:27 pm

gigant0r wrote:btw, does anyone have any pictures of similar amp so I can compare them?


Here is my '71 JMP50 USA model. Mostly original.

http://members.cox.net/dgrover/1971_marshall.htm
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Re: 1971 JMP 50 Smallbox

Postby Gaetano on Sun Oct 18, 2009 1:52 pm

Well, now its a difficult call.

Solder joints of OT impedance selector look almost perfect, but i'm quite sure that its a replacement. The original one should have brackets like PT's ones.

Anyways, a photo of the speakers is very important. If they're original (cones) it is worth 2000€ for sure.
Bring your fair maidens out, for the vikings are coming to pillage. (Robert Plant)

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Re: 1971 JMP 50 Smallbox

Postby 908ssp on Sun Oct 18, 2009 2:00 pm

The OT should be a 139 not a 128 so it is most likely replaced with the wrong OT. Check the Marstran data base there is not a single 50 watt amp with a 128 later than 1967.

My Swedish 72 has an OT without the extra brackets but it has a 139.
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Re: 1971 JMP 50 Smallbox

Postby LD50 on Sun Oct 18, 2009 2:11 pm

Extra brackets came with 100watters, never seen a 60's or 70's OT with brackets, but am afraid the OT is a transplant (find someone with an early amp with a later OT and you are in business for a swap 8) )
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Re: 1971 JMP 50 Smallbox

Postby gigant0r on Mon Oct 19, 2009 7:35 pm

Ok, I've had a conversation with my local tech who claimed that everything in that amp is stock (except pilot lamp and few caps). The seller is 1st owner ( his dad bought that amp new in 1971) and he said he never even changed tubes in it..
That OT is a bit strange thing but there is a possibility that Marshall shipped it that way.
Anyway, I've bought it and this things sounds unbelievable.. it's alive :shock:

so for your viewing pleasure, a few pics:

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Re: 1971 JMP 50 Smallbox

Postby 908ssp on Mon Oct 19, 2009 8:31 pm

There is a remote possibility that the end bell was changed. If for example one of the feet on the original end bell with the 139 stamp was broken maybe someone put a 128 end bell on it to replace the foot. Wonderfully clean set. Very curious.
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Re: 1971 JMP 50 Smallbox

Postby LD50 on Mon Oct 19, 2009 9:25 pm

908ssp wrote:There is a remote possibility that the end bell was changed. If for example one of the feet on the original end bell with the 139 stamp was broken maybe someone put a 128 end bell on it to replace the foot. Wonderfully clean set. Very curious.


That is the only plausible conclusion on a '71 amp with the selectors looking original etc.

Interesting things are 1k on V2a, no 0.68uF on V2b (with 47k NFB would normally expect one).

Odd how the wiring is there for snubbers but one of the turrets is offset and there is intact dye on the turrets.

The rest of it is amazingly clean and tidy.

Glad it sounds good too :cheers:
All bleeding stops.......eventually.
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Re: 1971 JMP 50 Smallbox

Postby Kuli on Tue Oct 20, 2009 6:20 am

Nice looking halfstack!! Congrats!
'66 JTM 45
'66 JTM 45/100
'68 1959T Super Tremolo
'69 1987 Lead
'69 Royal Purple 1960B basketweave
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