Nashville 400 hum

Allen Peterson · Post by **Allen Peterson** » 12 May 2008 12:21 pm

My middle 80s Nashville 400 has a hum. If I turn the reverb down to about 2 or below, the hum stops. Has anyone else ever had this problem? How do I fix it?

Allen Peterson

Curt Langston · Post by **Curt Langston** » 12 May 2008 1:03 pm

Allen, I would do these things first.
(1) Unplug the unit! Then gently unplug the molex reverb cable connector from the bottom of the chassis, by using a slight rocking motion while pulling downward. Look inside the female ports checking for tarnish. If visable tarnish or corrosion is there, spray it with Radio Shack contact cleaner/lubricant. (Be sure it is both a cleaner and lubricant.) If this is not the problem, then:

(2) Remove the reverb pan cover and take off the cardboard bottom. Look inside at the connections. You can tell right away if one of the springs have come of the little hooks. If one has, then put it back on. If one is broken off, either replace the reverb unit, or send to Peavey. It will be cheap.
Also, check the connection on the outside of the pan. Are they making good contact?

(3) If all is intact with the cables and springs, and no corrosion is seen on the molex connectors, remove chassis and send to Peavey. Usually a cheap fix, and you're good to go another 20 years.

Ken Adkins · Post by **Ken Adkins** » 12 May 2008 5:38 pm

I am having the same problem with my Nashville 400.
If I flip the ground switch a few times it will stop but soon to come back. It does seem to be in the reverb circuit because turning down the reverb control makes it stop. Thanks for any help. Ken

Jim Taylor · Post by **Jim Taylor** » 12 May 2008 9:43 pm

I have the same symptoms with my NV112.

Jack Stoner · Post by **Jack Stoner** » 13 May 2008 2:13 am

I had a hum problem in my Nashville 400 from when it was new. I worked on it and Peavey worked on it when it went out under warranty and it still had the hum. I finally got into it and one of the ground pins for the reverb connector on the circuit board had a hairline crack in the Printed circuit and was causing the hum. After I resoldered the pin to the circuit board the problem went away.

But, both my Nashville 1000 and Nashville 112 have some hum when the reverb is turned up past about 4. It's not a problem as I don't use the reverb in the amps, I use the reverb in my POD XT.

Ken Adkins · Post by **Ken Adkins** » 12 Jun 2008 8:44 am

I got tired of this hum so I took it apart and found that where the reverb tank plugs in to the chassis was a bad solder joint. Resoldered the 4 prongs and now works fine. hope this might help others.