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Topic: Nashville 400 Problems |
John Knight
From:
Alaska
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Posted 2 Apr 2003 9:32 am |
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My Nash 400 is acting up and I would like some feedback. I get everything connected with or with out the effects loop and I get a week distorted sound. For about 5 miniutes and then boom I get the nice clean signal to come through. Last night I thought that the jacks my be in need of cleaning so I did that and then lost the signal altogether for about 2 miniutes and then boom nice clean signal again.
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D 10 Thomas with 8&6, '61'D-10 Sho-Bud 8&3
S12 Knight 6&4
Nashville 400 and Profex II
81' Fender Twin JBL's
Asleep at the Steel
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C Dixon
From:
Duluth, GA USA
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Posted 2 Apr 2003 9:47 am
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John,
When the problem is happening, reach under the chassis and wiggle the reverb plug back and forth a little. See if this affects the sound; for better or for worse.
IF it does, the connector is dirty. Disconnect it (may require considerably force) and reconnect it several times. This will tend to "clean" the contacts in the connector (called a Molex plug). Better yet procure "contact cleaner" from Radio Shack and spray it not only on the plug, but the jack as well.
If this does not help your problem, try this. With the amp turned off*, turn all the controls from one end to the other several times. One or more of the control's "wipers" may have developed some slight oxidation and actually be partially lifted off the carbon deposit inside the pot. Moving them back and forth tends to remove this oxidation. As mentioned above, contact cleaner is better.
Hope one or both of these helps. And God bless you,
carl
*> CAUTION: Do NOT run the pots from one end to the other with the power on. Here is why. IF there is oxidation, and it clears while moving the pot, you will hear a horribly loud pop thru the speaker.
Not only can this damage the speaker, but worse; it can caused temporary to permanent damage to your ears. For those who have experienced this earth shattering pop, they will agree with what I am saying. [This message was edited by C Dixon on 02 April 2003 at 09:52 AM.] |
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Steve Schmidt
From:
Ramsey, MN, USA
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Posted 2 Apr 2003 10:05 am
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John,
Another thing I've seen on these amps is that the line in / line out contacts become dirty. Take a standard guitar cord and plug one end in the in, and the other end into the out. See if that gives you any clues. I've seen this on a few Peavey amps. |
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John Knight
From:
Alaska
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Posted 4 Apr 2003 9:56 am
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Thank you guys, contact cleanier and running the wipers with the amp off seems to have solved the problem.
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D 10 Thomas with 8&6, '61'D-10 Sho-Bud 8&3
S12 Knight 6&4
Nashville 400 and Profex II
81' Fender Twin JBL's
Asleep at the Steel
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Gino Iorfida
From:
Pittsburgh, Pennsylvania, USA
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Posted 4 Apr 2003 11:04 am
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A tip to use, AFTER you clean the molex connector (with the amp off, some 600 grit paper can lightly take off the oxidation), get some of the Caig ProGold GXL, and put a drop on a qtip and lightly brush it over the pins, that will keep the oxidation from coming back. I use the stuff on all tube pins for tube amps after i clean and retension the sockets... it's a must when usign NOS tubes.... but it will work equally well for the molex connector (and the wires going into the speaker terminals as well). My parts dealer gave me a sample tube a few years ago (size of small super glue tube, or smaller), and it's lasted me this long... so a VERY little goes a long way!
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