Ok ..
My Namco noir has ..
No left channel on the amp .
So I have made some quick disconnect connectors to mate into the original connecters so as not to hurt any of the original leads .

Amp on left is noir amp
Amp on right is namco animal kieser amp .
Diffrent but I’m going to give it ago ..
I can now utilize the 12v
And connect up to speakers in the cab without cutting any original cables .
Also one of my original speakers has the rubber perished ..
I used to refurb B&o replace rubbers
So will replace the rubbers on both speaker.
As for the noir amp with 1 channel I will investigate that ..
Connect it up on the bench
See how it performs away from the cabinet wiring .
If it’s still bad
See if I can repair it ..
Maybe try a new ic / filter cap