Help with Marshall Cab 1/2 working

[ithanii]

Hey Gear Forum!

I have a 1960a Lead Marshall Cab that ive had for about 20-25 years
it has 4 Celestion G12t 75 watt 8hm speakers in it with 2 input 8hm left/right on the back.'
When the cab is used only the left side (facing the front logo) speakers work. Nothing comes out the right at all, even when switching the input cables from the head.

I opened it up to see if anything looked bad - but everything still looked untouched, no burn marks or fraying of the cables, the speakers didn't look blown or anything, so im confused.

Do you guys think its worth ordering 2 speakers and seeing if that is the issue - or do those input jacks on the back go bad?

Any help is appreciated!

Thanks!

​

 

[Red Solo Cup]

Bad switch. I would start troubleshooting there.

 

[JiveTurkey]

Back panel, 100%

 

[TSJMajesty]

Go inside and switch the wiring. If the pair of speakers that weren't working now produce sound, and the other 2 don't, you know it's the jack.

 

[ZEN Amps]

Do you guys think its worth ordering 2 speakers and seeing if that is the issue

No! As the guys said, those jackplates have been known to fail - so start there.

If you ever want to change speakers though, they're almost definitely 16Ω models.