Acoustic preamp problem

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lincolnbluelincolnblue Frets: 95
edited July 30 in Guitar
 I wonder if anyone can help. I have a Faith Neptune Trembessi which has the below preamp.

The guitar has been playing up recently whereby when plugged in, the sound keeps cutting in and out. I tried various things like different cables, batteries etc but tonight I worked it out. The circled button "EQ-S" seems to be the culprit. If I slightly touch it, the sound cuts out. Pressing it in or out doesn't make a difference. 

(To be honest I've never quite put my finger on what the button does) Does anyone have any idea what could be the solution to this? Could it be an easy fix or would it need taking to a luthier?

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  • lincolnbluelincolnblue Frets: 95
    Anyone able to offer any advice?
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  • FunkfingersFunkfingers Frets: 5408
    Given that the pre-amp has dedicated Treble and Bass controls, the likeliest explanation for the EQ-S is a feedback cancelling notch filter.

    If the guitar warranty has expired, your first move should be to unscrew to the pre-amp panel. Lift it out carefully. Inspect the underside for loose connections, dry solder joints or corrosion.

    Spray Servisol electro-lubricant into the EQ-S contacts. Repeatedly depress and release the button to ensure that the cleaning is effective.

    Plug in. Test the controls. If everything works, screw the control panel back into place.


    Be seeing you.
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  • lincolnbluelincolnblue Frets: 95
    Given that the pre-amp has dedicated Treble and Bass controls, the likeliest explanation for the EQ-S is a feedback cancelling notch filter.

    If the guitar warranty has expired, your first move should be to unscrew to the pre-amp panel. Lift it out carefully. Inspect the underside for loose connections, dry solder joints or corrosion.

    Spray Servisol electro-lubricant into the EQ-S contacts. Repeatedly depress and release the button to ensure that the cleaning is effective.

    Plug in. Test the controls. If everything works, screw the control panel back into place.


    Thanks. I shall give that a try and get some Servisol
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