reverb problem on nash 400

[sylvainvallieres]

Hi everybody,I've put a hand on a old Nashville 400(around 89)and after two minute of operation the reverb fall down,I close the amp some minute and when I put it on, the reverb is back again for two or three minute and fall down again,big problem or just a little visit at the Peavy doctor?someone know about this?thank you and have a great new year,sylvain

[Jerry Heath]

I'd check the molex connector. Make sure it's not loose. This is a common problem. Do a search on the forum for "molex" you'll see other people having the same problem and you'll also find some recommended fixes.

[Jack Stoner]

The connector that plugs into the underside of the amp from the reverb pan (a "Molex" brand connector) is the weak spot in the reverb system. Sometimes just "reseating" the connector (taking it off then plugging back in) will "clean the contacts". Other times taking the connector off then spraying contact cleaner on both the male and female pins will fix it. Other times one of the female pins in the connector will need "reforming" (making smaller) so it makes good mechanical/electrical contact.

There can be other problems but the majority of times the connector is the culprit.

[sylvainvallieres]

thank's everyone for your reply,I try your sugestion and it's work,the reverd come alive but now i've got a little distortion noise on some note I try some change on equaliser if it's change something or I need to make a caps job,thank's again,Sylvain

[Ron Page]

You'll want to keep the pre-gain below the post-gain setting in order to avoid distortion.

If you need the Nashville 400 manual I believe it's available for download through the Peavey web site.

[Jim Palenscar]

If you continue to have problems- remove the chassis from the cabinet (remove the back plate from the cabinet, the 4 screws on top, the speaker and reverb connections, and the power cord hold down inside the cabinet) and check the solder joints on the other side of the molex connector. Just another common area of concern on those amps.

[Mike Brown]

Ensure that the two bare wires of the reverb harness are not touching each other.

[sylvainvallieres]

thank's all of you,I take all of your's recomandation and everythings work fine now,I appreciate your support,thank's again ,Sylvain

[Mike Brown]

What did you find that was causing the problem? Just curious.

[sylvainvallieres]

I just take out the molex plug,clean the four pins with nail stick(sand)put a little tension on the metal of the plug and I clean the connection on the reverb tank because the send connection have a little spot of oxide,Sylvain