Help me figure out what Marshall Amp this is ……

[Anand Mahangoe]

Hi Gentz !
Friend of mine bought this Marshall Amp many years ago and according to the seller it was a 1976-77 model….. Now I borrowed it and wanted to know if this can be a JMP or Plexi or perhaps a Marshall clone ?

It sounds quite heavy bass and don’t even use the Channel II

Here are some pics…

Thanks for looking !

 

[mark123]

Where are the pictures??

 

[Rokinroller]

Great pictures ! Nice amp

 

[Anand Mahangoe]

Where are the pictures??

Had to resize them…. Should be fine now

 

[mark123]

Had to resize them…. Should be fine now

Is there an inspection sticker on the chassis?

 

[Anand Mahangoe]

Is there an inspection sticker on the chassis?

You mean inside ? Than I have to take the amp out of or take out the back…. Will check when I get back home !

 

[fitz]

according to the seller it was a 1976-77 model….. Now I borrowed it and wanted to know if this can be a JMP or Plexi or perhaps a Marshall clone ?

It sounds quite heavy bass and don’t even use the Channel II

S/A = 50w
J = 1977
JMP MKII
Not a clone, or a really good one.
Could sound bassy from mods.
Gut shots for the gurus may answer some questions.

 

[neikeel]

As above
They do sound quite juicy. I had a very similar '76 (H suffix)
Internal pics needed to say any more.

 

[Matthews Guitars]

Model 1987 (lead) or 1986 bass. JMP. Made in 1977. 50 watts, no master volume.
Based on your tone description, I'm going to go with 1986 bass model.

While there is no trace of the JMP logo to the left of the mains power switch, they do tend to get rubbed off over 50 years+

It's not a "plexi" but is descended from it. True plexis ended production in 1969.

 

[Anand Mahangoe]

Oh that’s awesome guys !!! Thanks a lot for the expertise ! At least I can name it correctly when making a YouTube video

 

[Ned B]

Probably a model 1987 or 1986. After the advent of the Master Lead series one could still order the classic models. I remember seeing a 1959 from 1980 that had rocker switches but otherwise a Super Lead.

 

[Seanxk]

Just for reference, where the selectors are at the moment you're running 8ohms on the speakers and 220/230V on the mains, as long as things haven't been changed inside that is.

 

[LPMarshall hack]

Also, don’t the metal toggles indicate a Canadian model?

 

[AtomicRob]

It sounds quite heavy bass and don’t even use the Channel II

I see in the first pic that you have the bass knob in the only useful position… ZERO I‘m sure there must be some situation where a guitarist would move that knob, if anyone ever finds out let me know!

 

[Tatzmann]

I once had a nice big ol analog 24 channel live mixing-desk made by Meazzi, Italy.

The sound of the thing was unbelievably vintage
and big.

Had a very nice built-in tapedelay too.

Traded it in for some stupid crap. Didnt make such mistakes often though.

Meazzi made a lot of stuff, from tube-amps to
organs, p.a. stuff, and did import Marshalls as it seems.

Well, its a 1977 Non-Master Marshall,
imported and distributed by Meazzi to Italy.

A fine amp.

If you want to know everything about it you have
to make detailed pictures of its transformers,
inspectiontags plus circuitry inside the amp-chassis and post them here.

 

[Anand Mahangoe]

Thanks again a lot Gentz !! For now I have enough for a video and will make pics and shots from the inside too next weekend !
Will drop the YouTube video here too !

Very much appreciated all the help from all of you !

Anand

 

[neikeel]

Also, don’t the metal toggles indicate a Canadian model?

Change over in Europe was late 76/early 77