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Those gray wires are shielded cables. You should have 1 or maybe 2 conductors that connect at both ends, and an extra conductor that is grounded at 1 end only. You won't see that wire on the other side. That wire grounded on 1 side only is the shield for that cable.
So I found a diagram for Cliff jacks that might help, however it is for mono jacks with a shorting switch. You can find that here.
Anyway, the Molex connector will need to be recrimped, and yes, that could have something to do with the problem. I dislike Molex connectors for things that might...
Okay... Let me try to recap some of what I've read, so you don't have to do everything.
So yes the hum is there with nothing plugged in going up with the volume control as we turn up. The noise also goes up by plugging in a cord only.
Hum/noise with just a cord plugged in is normal. The...
Slow down (I know that's hard to do when you've waited so long to get this resolved).
I don't know how much repair/guitar amp experience you have, so I'll go through a couple simple ways to deal with this.
Nigel is right that the guitar amp circuits are often simple (very much so compared...
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