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Topic: Amp Start Up Bang! |
Jim Saunders
From:
Houston, Texas, U.S.A.
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Posted 11 Sep 2019 10:42 am |
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| I have a NV112 and when it is first turned on it gives a hefty BAMM! This is probably a common issue. What's up with this? |
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Charlie Hansen
From:
Halifax, NS Canada and Various Southern Towns.
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Posted 11 Sep 2019 11:13 am
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Maybe you're leaving the master volume turned up. Just a thought.
_________________
I don't know much but what I know I know very well.
Carter S-10 3X5, Peavey Nashville 112, plus Regal dobro and too many other instruments to mention.
Bluegrass Island CFCY FM 95.1 Charlottetown, PE, Canada, on the web at cfcy.fm.
A Touch Of Texas CIOE FM 97.5 Sackville, NS, Canada,
on the web at cioe975.ca. |
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Ian Rae
From:
Redditch, England
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Posted 11 Sep 2019 1:49 pm
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That shouldn't matter - we don't all have to turn the volume down before we switch on.
It's more likely a defective capacitor either in the power supply (smoothing) or at the front end (DC blocking).
_________________
Make sleeping dogs tell the truth!
Homebuilt keyless U12 7x5, Excel keyless U12 8x8, Williams keyless U12 7x8, Telonics rack and 15" cabs |
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Paul Sutherland
From:
Placerville, California
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Posted 11 Sep 2019 2:41 pm
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I've had 4 or 5 Peavey amps over the years and they all did that. It's nothing to worry about IMO.
_________________
It don't mean a thing if it ain't got that swing. |
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Chris Grigsby
From:
Boulder, CO
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Posted 11 Sep 2019 4:59 pm
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Just picked up a Nashville 400 and it does the same thing. I called Peavey and they said the same thing Ian said above, i.e. it is probably a capacitor that needs to be replaced.
_________________
Mullen Discovery S10, Hilton VP, Kemper Profiler Head and Kabinet. |
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Jerry Overstreet
From:
Louisville Ky
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Posted 11 Sep 2019 6:15 pm
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Normal 400 and similar amps have a moderate soft power on thump, but it's not severe. I'm leaning toward Ian's comments. If you're having an attention getting, rafter rattling bang, you have a problem.
Since I've never owned a 112 however, I'll defer to the more familiar with this amp. |
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Jack Stoner
From:
Kansas City, MO
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Posted 12 Sep 2019 2:07 am
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I just tried my (older model) NV112 and it has a very low level "click" when its turned on. No big pop like the older Peaveys like the NV400 does. From what I remember, talking to Mike Brown, the "pop" issue was addressed with a power supply redesign in the NV112.
Thus others are correct, if you are getting a loud pop its got a problem. |
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Tony Prior
From:
Charlotte NC
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Posted 12 Sep 2019 5:40 am
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My Nv112 does not do it, its about a 2000 build. A very mild pop when powering off is all.
tp
_________________
Emmons L-II , Fender Telecasters, B-Benders , Eastman Mandolin ,
Pro Tools 12 on WIN 7 !
jobless- but not homeless- now retired 9 years
CURRENT MUSIC TRACKS AT > https://tprior2241.wixsite.com/website |
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Dom Franco
From:
Beaverton, OR, 97007
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Travis Wilson
From:
Johnson City, TX
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Posted 12 Sep 2019 5:08 pm
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| Also sounds like a bad capacitor to me too. Just do a visual for swollen capacitors and look for the culprit. |
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Travis Wilson
From:
Johnson City, TX
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Posted 12 Sep 2019 5:09 pm
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| Also sounds like a bad capacitor to me too. Just do a visual for swollen capacitors and look for the culprit. |
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George Kimery
From:
Limestone, TN, USA
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Posted 13 Sep 2019 12:38 pm Amp start up bang
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| I had an amp that did that. I just cut the volume off when turning it on. |
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Peter Harris
From:
South Australia, Australia
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Posted 15 Sep 2019 3:50 am Re: Amp start up bang
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| George Kimery wrote: |
| I had an amp that did that. I just cut the volume off when turning it on. |
For some reason (?!) I always turn the volume down to 'off' before I power OFF an amp...it stays like that until after I power it ON again..
Can't remember who told me to do that decades (yes!) ago, but it has never failed me..through a LOT of amps, both SS & tubed.
 
_________________
If my wife is reading this, I don't have much stuff....really! |
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Ken Fox
From:
Nashville GA USA
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Posted 15 Sep 2019 5:34 am Big Bang theory
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Hi Jim ,
If you get a chance try plugging a cable into the power amp in jack. Then turn it on. If the Big Bang is still there then the issue is in the power amp area and could be a filter cap or other issues
If the loud noise is gone it would be in the preamp board area. That could be dirty input jack contacts, or the loop effects contacts, a bad IC chip or cap
Let us know if that helps isolate the problem |
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Jim Saunders
From:
Houston, Texas, U.S.A.
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Posted 18 Sep 2019 6:10 am Amp
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| Ken, I tried your suggestion and the bang is gone! I will try cleaning the input jacks later today. Thanks! |
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Ken Fox
From:
Nashville GA USA
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Posted 18 Sep 2019 6:54 am
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Also press down on the IC chips to make sure they are seated good.
You can also isolate it closer by inserting a jack into return jacks on the post and Pre EQ
That may isolate it to particular IC in the pre-amp stage.
Also good to clean those return jacks as well. |
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