Major output jacks

Discussion in 'Let's Talk Vintage' started by pete mac, Nov 11, 2019.

  1. pete mac

    pete mac New Member

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    3B0D6552-600B-4FB3-96D3-F09929C62F09.jpeg 6B1ADE4E-A095-407D-9FCC-FB6E2F8AD644.jpeg
    Hi guys ,I’ve got a ‘72 major lead with 4 output jacks and a ‘74 major bass with 2.I’m sure someone had some info on when/why they changed but I can’t seem to locate it . Any ideas? Thanks and regards Pete
     
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  2. jmp45

    jmp45 Well-Known Member

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    Can't help with those details but my 72 Major also has 4 output jacks. This was before reverting back to original. 1959 is jacked into the hotplate.

    [​IMG]

    [​IMG]
     
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  3. Filipe Soares

    Filipe Soares Well-Known Member

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    mine has 2... I think mine is 69.

    major.jpg
     
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  4. South Park

    South Park Well-Known Member

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    Duel speaker set up check schamatic
     
  5. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    that looks modded...

    [​IMG]

    Did Marshall punch a hole through the "MAJOR" text?
     
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  6. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Looks like somebody tried to install an effects loop.
     
  7. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    that's what I thought...
     
  8. pete mac

    pete mac New Member

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    It’s extra speaker outputs but looks stock inside,I’ll take some internals.Pete
     
    Last edited: Nov 12, 2019
  9. pete mac

    pete mac New Member

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    The ‘74 has the chassis punched for 4 output jacks but only 2 fitted.
     

    Attached Files:

  10. Matthews Guitars

    Matthews Guitars Well-Known Member

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    Not sure about the Majors but as I understand it, for the 1959s at least, US models got all four speaker jacks installed for some reason relating to UL certification that I don't fully get. If I see an old 1959 with only two speaker jacks fitted, I thus presume it was meant for the UK/European market, or at least wasn't intended to be exported to the US from the factory.

    It might be that the same rule applies to the Majors. But that is strictly my speculation. Don't trust it wihout corroborating evidence.
     
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  11. neikeel

    neikeel Well-Known Member

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    Those holes are added.
    The driller killer went over the logo - not a factory feature.
    Maybe tried to cover their tracks by making them into speaker jacks?
     
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  12. ampmadscientist

    ampmadscientist Well-Known Member

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    I never have enough speaker outputs, what a clever idea.
     
  13. Matthews Guitars

    Matthews Guitars Well-Known Member

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    I want to add the Major back panel to my product inventory. I have a file built for it but I need to confirm that it's correct.

    If someone who has a Major would be interested in helping out, I'd like to send one of you a paper printed proof copy that's at 100 percent scale, which you can compare to the back on your Major and identify any errors on it so I can correct them. That seems to be a lot easier than asking if I can borrow your amp!
     
  14. guzzis3

    guzzis3 Active Member

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    My major is a plexi, 68 I THINK but I've put the build sticker somewhere safe...

    It has 2 speaker outputs. It is a lead model (1967?)
     
  15. pete mac

    pete mac New Member

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    Interestingly 200w rms into 4 ohms is 7A , the best traditional jack socket i can find is 5A , let alone the plug rating.If you remove the worn/dodgy impedance selector , you can fit a speakon cobi socket without drilling any holes at all and it's rated at 15A on the jack out part.So i'm wiring all 4 sockets on both for 8x2 ,16 , 4 and the speakon as 4.Hopefully that will avoid any mismatch with the output transformer and keep it running for a while longer !
     

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