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Topic: Nashville 400 poping off |
Joe Kaufman
From:
Lewiston, Idaho
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Posted 30 Jan 2002 8:12 pm |
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I have a small problem with my Nashville 400, when it is turned off it will make a loud pop every 30 min or so. Other then that it works fine. More details:
-It is still plugged into the guitar and the wall outlet
-I live across the street from a small fm transmitter
-It is in my small day room here at college, so it is mildly annoying as I try to study
-In the same conditions a 68 VibroChamp doesn't pop.
What could be causing it? or how could I fix it? Mostly I was wondering if it was a symptom of a problem I need to fix, as I can live with the pop if I need to.
Thanks |
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Joe Kaufman
From:
Lewiston, Idaho
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Posted 30 Jan 2002 8:16 pm
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I just realized I spelled the title of the post wrong...be kind as I have no clue how to edit it  |
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Jim Smith
From:
Midlothian, TX, USA
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Posted 30 Jan 2002 8:22 pm
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I don't know what's causing it but unplugging it will make it stop. If I were you I would definitely unplug it until you find out what is causing it. It sounds like maybe the power switch isn't completely shutting off the power. I would be very afraid that it could catch on fire!  |
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Bill Crook
From:
Goodlettsville, TN , Spending my kid's inheritance
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Posted 31 Jan 2002 6:10 am
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Joe ......
Most Hi-powered amp make this pop sound when powered down. Without going into a lot of detail here,What happens is when you remove the A.C.power(as in turning off the amp) the bias is removed from the transistors BEFORE the D.C. power is removed from the circuit. In this case,the transistors are turned fully on(full volumne). Now as the D.C. power is suddenly removed from the circuit, it is disapated as a very high amptitude spike. This is heard as a loud "pop" in the speaker. Some amps have a relay that semi controls this problem,but most don't.
This topic has been discussed many times here on the forum, There has been many suggestions as to what to do about it,some good,some funny,some really bad ideas.
All in all tho, This dosen't seen to really hurt the amp,Only scares the operator. Please do a search on this topic here on the forumn and I am sure you will find a reasonable remedy to your worrys. |
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Bill Crook
From:
Goodlettsville, TN , Spending my kid's inheritance
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Posted 31 Jan 2002 6:22 am
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After re-reading your post, I noticed you said "After it has been turned off for 30 minutes or so". In this case, I think I would follow Jim Smith's very wise advice.
One thing you might do is take the amp somewhere a bit distant from the radio transmitter and see what happens. if the problem go away,it's due to RF drivin' the speaker.(A long and teckie thing here,not to be worred about in the least)If not,I'm sure Jim has the right idea, the amp's A.C. power switch may not be shuttin' down all the way.
In which case, I would take it to a reliable tech to have it checked out.
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Mike Brown
From:
Meridian, Mississippi USA
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Posted 31 Jan 2002 7:31 am
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Joe, if there are various electrical devices being turned on when this occurs in your building that are possibly on the same AC circuit, it could be a false trigger of the AC triac. I suggest that you have a qualified technician bench check the amp and make the necessary repair to resolve this. You can send us the chassis and we will repair it for you. Our address is;
Peavey Service Center
Hwy. 80 East
Meridian, MS 39301
Please include a daytime phone number that we can reach you on.
Thanks,
Mike Brown
Peavey Electronics Corporation |
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Joe Kaufman
From:
Lewiston, Idaho
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Posted 3 Feb 2002 11:23 pm
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Thanks everybody, I'm taking it into the shop this week...
Joe |
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Lee Baucum
From:
McAllen, Texas (Extreme South) The Final Frontier
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Posted 4 Feb 2002 3:23 pm
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In the "For What It's Worth" category, I'll add this:
In the spare bedroom where I keep my gear set up, I notice the same thing happening with both my Nashville 400 and my Evans. Everything can be turned off and when someone turns on a light in another room, whichever amp is plugged in will make a popping noise.
It's been going on for years. Now, I just plug everything into one strip and turn off the strip when I'm not using any of the equipment.
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Lee, from South Texas |
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