Noise from treble knob

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Audcog
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Noise from treble knob

Postby Audcog » Sun May 20, 2018 4:14 pm

I have a 2 yo DC400. The other night I started hearing a lot of “hiss”. I plug in another guitar and hiss went away. It seems be coming from my tone control (passive) treble control (active), turn up tone noise goes up but is not completely eliminated by dialing tone all the way down. Noise is louder on active pup. Bass tone control doesn’t affect the level of the noise (perfectly silent). Still under warranty but no sure if should spend $ to send back/return to be checked out. Any insights?

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UnexplodedCow
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Re: Noise from treble knob

Postby UnexplodedCow » Mon May 21, 2018 9:40 am

Have you checked the battery?
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Re: Noise from treble knob

Postby Audcog » Mon May 21, 2018 12:58 pm

Yes, I thought the new battery helped at first but noise is still there. Tried a few different amps and hiss is loud in all of them. Still under warranty so I think I will send it back $150 to ship one way :(

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Re: Noise from treble knob

Postby UnexplodedCow » Tue May 22, 2018 8:58 am

Normally that type of hiss is brought from either low volts, or something going wrong in the preamp module.

You could just have a dirty output jack (which switches the battery supply on inside the guitar), and spraying some cleaner in it, and running a plug in and out a few times might do the trick. De-oxit is popular/great for this.

If it's not that, consider taking the guitar to an amp/pedal tech to have the circuit traced, as the modules themselves are relatively simple op-amp designs. It could be something as simple as a micro-cracked solder joint, or tin whiskers on a couple of the SMT components, or maybe on an op-amp. Maybe a dirty pot, or bad connection caused this (there is at least one ribbon cable in that cavity).

It would likely be cheaper for the amp tech to resolve the issue than to ship across the country for Kiesel to fix under warranty. I ran into this issue with the Vader nut retrofit: it would have cost me more to ship it there/pay for the retrofit than it would to pay a local luthier to retrofit a replacement. Warranty needs are *the* biggest downside to a mail-order business model.

I hope some of this helps.
We are entitled to our own, wrong, opinions.

Guitar theorem: G=X+1 where G= guitars one needs, and X = guitars one has.

Do or do not; there is no understand.

Audcog
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Re: Noise from treble knob

Postby Audcog » Tue May 22, 2018 9:43 am

Thanks, very helpful. I’ll post a response when I get it fixed for everyone’s future reference.


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