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Topic: Noisy Reverb After Warmup |
Bryan Rankins
From:
Missouri, USA
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Posted 28 Apr 2007 4:35 pm |
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I have a N400 that is dead quiet when you first turn it on, then the reverb starts to hiss/hum after about 20 minutes of playing. If I turn the reverb off,the noise is gone. Any ideas or suggestions?
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09'Rittenberry SD10 (3&5),Thomas D-10 (8&4), Sarno Preamp, BJS bars, Hilton Volume Pedals, Boulet Boots, Walker Seats. |
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Ken Fox
From:
Nashville GA USA
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Posted 28 Apr 2007 6:01 pm Reverb hiss
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I would first suspect the IC chip associated with the reverb drive and return circuits (dual opamp, 4558). This is a plug in chip and easy to change out.
After that I would clean all connections at the reverb tank, RCA male connctors and Molex connectors on ht e reverb harness assembly. Re-tension the Molex connectors on the reverb harness (I use a small flat blade screwdriver blade to accomplish that). |
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Jim Palenscar
From:
Oceanside, Calif, USA
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Posted 7 May 2007 6:17 am
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| It has been my experience that the most common fault in older 400's is the connection of the molex connectors to the circuit board. I would start by cleaning all connectors and re-soldering the connector pins on the board. |
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Larry Robinson
From:
Peachtree City, Georgia, USA
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Posted 7 May 2007 8:44 am
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I recently fixed a Peavey amp with the same symptoms. I disconnected the Tolex connector, sprayed Deoxit D5 on contacts and re-tensioned the connectors inside the Tolex connector, removed and sprayed the RCA connectors on the reverb tank. This cured the problem. However, there could be something else but I would check the mechanical things first.
Larry Robinson |
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