Issues with peavy nashville 400

[Grayson Flynt]

I recently picked up a nashville 400 this weekend. So my problem is that i will randomly play and while im the middle of playing a ground hum occurs and wont stop until i flip the ground switch. Then it will just happen again randomly in the middle of playing. So, my questions are

1. Is this a common issue?

2. Is it a easy fix?

[Larry Dering]

It's possible the reverb tank pins are oxidized. Remove connection and clean with alcohol and make sure they are tight. I use a little copper bristle brush and alcohol. Hope that helps. There is other possible issues but this would be my first thing to do.

[Stephen Cowell]

In general, if it's got silver strips, it needs DeOxit in the molexes and loop return normal contacts. I re-tense every Molex socket and the reverb RCA's. Got my N400 for 150$ (nice Tuki cover) because it wouldn't play right until I jumpered the loop.