Nashville 400 with buzzzzzzz

Bob Mainwaring · Post by **Bob Mainwaring** » 18 Nov 2005 12:42 am

I still didn't get my Nashville 400 sorted out regarding the hum but I need to get it fixed pretty soon as the small Fender amp that I patch through the main frame with has started to hum too!! In the earlier stages I could just swap the ground swith over and it went, but it's there all the time now.
I tried the Peavey site to see if there would be a schematic or some other info I could download, as a good friend of mine into electronics says he could eliminate the hum for me.

Bob.

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Jack Stoner · Post by **Jack Stoner** » 18 Nov 2005 3:57 am

Since you now have two amps that hum, I wonder if it's something external to the amps that is causing this?? e.g. a bad AC power ground.

Bob Mainwaring · Post by **Bob Mainwaring** » 18 Nov 2005 8:26 am

Thank's for the "comeback" Jack.
The smaller "Fender Sidekick Reverb 35" had/has always been a good little amp too and does the same thing whatever I use for hooking up the equipement although it's hum is quite a lot quieter than the Peaveys'.

Bob

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Jack Stoner · Post by **Jack Stoner** » 18 Nov 2005 8:30 am

If the amps are "quiet" by themselves but have hum when you connecto something to them then it's not an "amp" problem.

There are many documented cases of "ground loop hum" which is caused by the difference in ground "potential" between devices.

The ground loop hum occurs when using two amps together. The Korg DTR1 and 2 rack tuners are known to cause ground loop hum when mounted in a rack.

Many potential points for hum and connecting to a "board" can be one of those.

Bob Mainwaring · Post by **Bob Mainwaring** » 18 Nov 2005 10:31 pm

Jack, thank's for the come-back but both of them hum on their own accord without anything else hooked up to them.
The Peavey is the worst one considering that the ground + or - switch dosent seem to want to work continually may look like a switch problem at first but the hum comes back right away unlike how it opperated before.

Bob.

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Jack Stoner · Post by **Jack Stoner** » 19 Nov 2005 3:08 am

But, do they just "hum" in one physical location? e.g. if you took the amp to a different residence, studio, etc do they still hum?

Bob Mainwaring · Post by **Bob Mainwaring** » 19 Nov 2005 8:26 am

Yes Jack - they do. In fact a good buddy of mine is going to take a look at the 400 today to see what/if there's a problem with the ground switch. With going through a main frame my thoughts were it might have been that scenario - but on their own they're just the same........humming.

Bob.

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Calvin Walley · Post by **Calvin Walley** » 19 Nov 2005 9:34 pm

when we moved into our new house i set up a music room at one end of the house , as soon as i turned on my amp it had a buzz in it . i looked for a problem and could not find one till i looked out the window... there is a transformer about 75 feet away. I moved my music room to another part of the house and now have no more buzz.
hope its as simple as my problem was
calvin

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ZumSteel <font size="1" color="#8e236b"><p align="center">[This message was edited by Calvin Walley on 19 November 2005 at 09:35 PM.]</p></FONT>

Ken Fox · Post by **Ken Fox** » 19 Nov 2005 11:29 pm

Sounds like time for filter caps in the power supplys.

Mike Brown · Post by **Mike Brown** » 21 Nov 2005 6:40 am

Bob, if you wish to return the chassis, reverb pan and reverb harness to the factory for repair, send it to;
Peavey Service Center
Attn; Repair Department
412 Hwy. 80 East
Meridian, MS 39301

Please include a note of symptoms and a daytime phone number

Thanks.

Gary Preston · Post by **Gary Preston** » 26 Nov 2005 11:01 am

Mike ,any idea what the cost would be if the things that you refered to already was the cause of the hum ? As you know there are more 400's with the same hum here in Ohio . Four that i know of . G.P.