Help Diagnosing Amp noise

[guitarman967]

Two things to check:

1) Chassis ground. Make sure the ground wire form the power cable is securely attached to the metal chassis. It may have become corroded. And make sure they outlet you're plugging into is grounded.

2) Input ground. Check the ground on the input jack and ground connection(s) at the first gain stage. If the cathode cap on that gain stage fails, it can cause hum that changes depending on the guitar volume control setting.

+1
I chased down a hum like whats being described here for a day or two before I found an intermitent ground wire right on the input jack.

 

[Shizzeldizzel]

Thanks, that's the area we are looking at. I think my amp has one of those sealed jacks so it might hard to find right away.