ilovefuzz.com

So I've had this problem for a few weeks now. I just decided to attempt doing something about it. Playing through a Carvin head into a 4x12 with EHX speakers, I've had this buzzy hum that just appeared one day. I isolated the issue and realized it's the input on the cab. I can even jiggle the cable, and when I turn it towards the little part that sticks out and contacts the tip the cable, the buzzing stops. I can even get it to stay like this up until I start playing and the vibrations knock it out of that "sweet spot." It doesn't seem like it's making more contact with the input at that point but I'm not sure.

I've tried bending the part towards and away from the cable with no luck. I disconnected the jack from the cab to get a better look and there didn't appear to be anything wrong/bad connections. Any thoughts?

maybe you should just replace the jack. A high quality jack isn't that expensive and with minimal soldering skill it is easily doable. If you don't have a soldering iron/ aren't into DIY maybe you can have a friend help you out.
Also- have you tried a different cable yet?

Yeah I tried multiple cables with same result.

I do own a soldering iron. I'm not great with it, but I think I can handle this.

great! you should probably get a "high quality" jack like a neutrik or switchcraft.