Nashville 400 reverb buzzzzz

Mark Ardito · Post by **Mark Ardito** » 29 Jul 2005 5:31 am

Hey Guys,

My Nashville 400 has been a great amp for me and I really enjoy playing through it. All of a sudden my reverb has a AWFUL buzz to it. At times, it will totally distort my signal.

Anyone have any experience with this problem? I have checked the cables going from the spring to the amp and they are OK....anything else I should be checking?

Cheers!
Mark

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Sho~Bud Pro I, Fender D-8 (C6&E13) http://www.darkmagneto.com
http://www.arditotech.com

Mike Brown · Post by **Mike Brown** » 29 Jul 2005 6:20 am

If you can turn the reverb control down and buzz ceases, it could be that the ground wire on the RCA plugs at the pan, or the molex pins are loose at the chassis. You can check for this yourself if you are mechanically inclined. But, be extra careful when unplugging and replugging the white molex connector on the bottom of the chassis.

If you need further assistance, feel free to contact me here at the factory and I will be glad to assist. I can be reached toll free at 1-877-732-8391, ext. 1180.

Mike Brown
Peavey Electronics Corporation

David Doggett · Post by **David Doggett** » 29 Jul 2005 6:58 am

The Molex connectors on these amps are notorious for getting a little corroded and loosing good contact. There are many threads and comments about this in the past. Just unplug and replug these a few times to clean them up and restore good contact.

Mark Ardito · Post by **Mark Ardito** » 29 Jul 2005 7:17 am

Mike,

Thanks for the suggestions! I am at the office now, so when I get home I will take a look at try that...

One thing...

<SMALL>But, be extra careful when unplugging and replugging the white molex connector on the bottom of the chassis. </SMALL>

Why should I be careful with these? Are they fragile?

Thanks!
Mark

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Sho~Bud Pro I, Fender D-8 (C6&E13) http://www.darkmagneto.com
http://www.arditotech.com

Jack Stoner · Post by **Jack Stoner** » 29 Jul 2005 7:34 am

The "Molex" connector plugs into pins that are soldered to the main circuit board in the amp. There is potential for problems with one of the circuit board pins if you get too "heavy handed", especially since the Molex connector tends to be tight.

The best way to get at the connector is to remove the upper back panel. That will give you better access to the Molex connector. If you have some contact cleaner, hit the male pins and the female pins in the connector while you have it apart.

Mark Herrick · Post by **Mark Herrick** » 29 Jul 2005 11:51 am

The Molex connector is also "directional" and will only plug in one way. If it isn't going in, don't force it, turn the plug around.

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Chris LeDrew · Post by **Chris LeDrew** » 29 Jul 2005 9:38 pm

I had a similar problem with my Session 400, and Mike Brown advised me to simply switch the rca plugs that connect the reverb tank to the amp - it worked. Thanks again, Mike.
It's worth trying, anyway, before you start breaking out the tool box...ha-ha.