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Topic: Nashville 400 issues |
Tommy Shown
From:
Denham Springs, La.
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Posted 18 Jan 2019 10:32 am |
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Last night I was doing some picking with my guitar when I noticed the sound dropping would get lower and sometimes it would shut down with power still on
What could this be?
Tommy Shown |
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Steve Hinson
From:
Hendersonville Tn USA
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Posted 19 Jan 2019 7:42 am
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| Check the Molex connector between the reverb tank and the chassis...they get dirty/loose...this is the most common problem with those amps and easily fixed. |
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Richard Sinkler
From:
aka: Rusty Strings -- Missoula, Montana
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Posted 19 Jan 2019 9:49 am
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I would also pull the chassis and check the molex plug that goes from preamp to power amp. Also clean the preamp out and power amp in jacks and run a plug in and out of them several times. These are things I have heard worked for others. Can't hurt.
_________________
Carter D10 8p/8k, Dekley S10 3p/4k C6 setup,Regal RD40 Dobro, NV400, NV112 . Playing for 54 years and still counting. |
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Blake Hawkins
From:
Florida
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Posted 19 Jan 2019 7:23 pm
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Do what Richard said. "Exercise" the jacks by inserting
and removing a plug 15 to 25 times. That will let the switch contacts clean themselves.
I do that with my 400 every few months.
Also, after not using my 400 for several months, I turned it on yesterday and got a hum with out the instrument plugged in. I'll spare you the troubleshooting details.
The trouble was the input jacks. Used the above technique and no more hum. |
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Ken Fox
From:
Nashville GA USA
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Posted 20 Jan 2019 7:06 am
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The preamp and power amp are all on one circuit board. Most problems like you describe arise from the power amp input jack contacts Just put a short cord from preamp out to power amp in and leave it there. That problem will be fixed
Next issue could be the speaker Molex connector. If it has one. Later models had the blue and yellow wires soldered, thus eliminating the connection issue. If you have a Molex connector you can re-tension the female connector for a better grip on the pin in the chassis
On rare occasion the from loop jacks can be an issue as well. I would get another jumper cable and patch those two jacks together and then leave it in place |
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Ken Fox
From:
Nashville GA USA
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Posted 20 Jan 2019 7:09 am
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| Blake is right on about the instrument input jacks. The contact on them can be dirty as well. That allows a lot of noise to be produced when there is nothing plugged in at one of the inputs |
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Mike Brown
From:
Meridian, Mississippi USA
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Posted 21 Jan 2019 7:31 am Basic servicing
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| It probably would not hurt to have your amp serviced, period. |
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