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Topic: I need some amp help |
Joe Drivdahl
From:
Montana, USA
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Posted 15 Apr 2014 7:27 pm |
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I have an old Peavey Nashville 400. Its been a great amp since I bought it in the 80s, but now it sounds like it has a blown tube. I don't see how it can be the speaker. I use it at home at fairly low volumes.
Any ideas?
Joe
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GFI Ultra, Gibson, and Fender. |
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Tom Gorr
From:
Three Hills, Alberta
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Posted 15 Apr 2014 7:52 pm
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| You say it sounds like it has a blown tube..of course it doesn't have tubes...most of the time when I have a tube blow in a tube amp, the amp goes completely silent! |
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Lane Gray
From:
Topeka, KS
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Posted 16 Apr 2014 12:45 am
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You could try running a signal from a stereo or computer into the power amp input to see if it's in the preamp or power amp.
There's transistors in the ICs, as well as the power amp.
If you're running an Izzy or other buffer, have you checked the battery?
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2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Joe Drivdahl
From:
Montana, USA
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Posted 16 Apr 2014 7:31 am
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Thanks guys,
Tom, Yeah it might not sound like a blown tube, but its dirty like on overdrive. That may have been a better way to describe it.
Lane, The only thing between the guitar and amp is my Hilton pedal. A friend suggested maybe the transistor too. Not sure how to go about fixing something like that.
Joe
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GFI Ultra, Gibson, and Fender. |
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Jim Eaton
From:
Santa Susana, Ca
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Posted 16 Apr 2014 8:01 am
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It might be "foam dust" in the voice coil gap if it has a BW speaker. Easy fix, costs nothing to check it and takes 10 min's. Do a search and you will find several posts about how to do it.
I got a Nashville 1000 from a pawn shop for $100.00 because it sounded just like your NV400 and cleaned the VC gap and it was good as new.
JE:-)>
_________________
Emmons D10PP 8/4 -75'
Emmons S-10PP 3/4 - 79'
Emmons S-12PP 3/4 -78'
MSA Legend SD12 5/5 -06'
Mullen S-12 4/5 - 1986
Nashville 112 x2 W/Knob Guards - Don't leave home with out one!
Walker SS rack system - 12"BW's
Quilter Steelaire Combo |
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David Nugent
From:
Gum Spring, Va.
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Posted 16 Apr 2014 10:09 am
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| If your amp has been used only at home for some time and the settings untouched, the pots may have become dirty and causing the symptoms you described. Try turning each control back and forth with the amp on and see if you notice a scratching noise (especially in the volume controls). Work the knobs on the noisy pots from full on to full off until the noise disappears or at least diminishes. |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 16 Apr 2014 10:05 pm
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Your best bet is to start substituting... divide and conquer. Try a different speaker... same problem? Then it's not the speaker. Plug an iPod into the power amp input... same problem? Then it's not the preamp or anything before it.
Normally on these amps it's either an internal connection or the speaker has the melted foam issue. From the sounds of it you should take it to a tech and have it done right, it's time for a maintenance visit anyway.
But, just for S&G's, put a short cord between power amp in and pre amp out... this bypasses the internal connections inside these jacks, one place corrosion can really effect your sound.
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Too much junk to list... always getting more. |
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