Major output jacks

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

 

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.

 

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

 

Duel speaker set up check schamatic

 

Looks like somebody tried to install an effects loop.

 

It’s extra speaker outputs but looks stock inside,I’ll take some internals.Pete

 

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

 

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.

 

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?

 

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

 

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!

 

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?)

 

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 !