Weird sounds coming from bass guitar

Ivchikx · 30th September 2011, 12:18 PM

Have a bass guitar Yamaha BB615 and Ampeg B-100R amp. Plugged guitar in, played a bit and noticed weird noises and poping sounds. Changed amps - same thing. Any ideas what's wrong?

phase_accurate · 30th September 2011, 12:27 PM

Maybe the situation improves as soon as you learn to play !

Regards

Charles

phase_accurate · 30th September 2011, 12:29 PM

Sorry - couldn't resist !

Can the built-in preamp be bypassed with a switch ? If yes do so and tell us what happens.

Regards

Charles

Ivchikx · 30th September 2011, 01:02 PM

Quote:

Originally Posted by phase_accurate

Maybe the situation improves as soon as you learn to play !

A good one! But that's not the case. I can play bass guitar. And the sounds doesn't dissapear when I stop playing. Checked the wire form guitar to amp. Even replaced guitar's TRS female conector.

Guitar inside in post atachment.

AstroSonic · 30th September 2011, 01:38 PM

The weird sounds are present even when the bass is not being played (but is connected). Therefore, the signal is not causing the amp to make these sounds (as they are present wothout a signal).

The weird sounds are present through other amps. Therefore, the cause is either the guitar or the wire between amp and guitar.

The wire between amp and guitar checks out ok. Therefore the wire is good.

That leaves only the guitar...

While you could confirm this by bypasing the active circuitry, that would be redundant at this point - it would just tell you what you already know: that it is the active circuitry.

Pull the board out and check closely all the connections and solder joints. If they all look ok, check the electtronic components. If the resistors are not discolored (even slightly), then the cause is most likely a bad electrolytic capacitor. You might consider replacing all the electrolytics with bass-friendly Nichicon Muse or Panasonic TSH (or other low esr types) caps. Can't really tell you which one, and most likely there will be no physical/visual indication of failure. If you do see a cap that shows swelling or leakage, definitely replace it. If you are not familiar with electronics have a knowledgeable friend help.

Good luck,

Bob

Enzo · 30th September 2011, 11:49 PM

What do you mean "the wire checks out"? Did you try a different guitar cord? And did you try this guitar cord with a different instrument? Intermittent connections and noises often won;t show up on ohm meters. Never assume.

Is there a battery in that axe? If so, is it up to voltage? And wiggling it, does it make noise? (Loose battery clip)

30th September 2011, 12:18 PM	#1
Ivchikx diyAudio Member Join Date: Feb 2011 Location: Baldone, Latvia	Weird sounds coming from bass guitar Have a bass guitar Yamaha BB615 and Ampeg B-100R amp. Plugged guitar in, played a bit and noticed weird noises and poping sounds. Changed amps - same thing. Any ideas what's wrong?

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30th September 2011, 12:27 PM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Maybe the situation improves as soon as you learn to play ! Regards Charles

30th September 2011, 12:29 PM	#3
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Sorry - couldn't resist ! Can the built-in preamp be bypassed with a switch ? If yes do so and tell us what happens. Regards Charles

30th September 2011, 01:38 PM	#5
AstroSonic diyAudio Member Join Date: Jun 2004 Location: central Pennsylvania, USA	The weird sounds are present even when the bass is not being played (but is connected). Therefore, the signal is not causing the amp to make these sounds (as they are present wothout a signal). The weird sounds are present through other amps. Therefore, the cause is either the guitar or the wire between amp and guitar. The wire between amp and guitar checks out ok. Therefore the wire is good. That leaves only the guitar... While you could confirm this by bypasing the active circuitry, that would be redundant at this point - it would just tell you what you already know: that it is the active circuitry. Pull the board out and check closely all the connections and solder joints. If they all look ok, check the electtronic components. If the resistors are not discolored (even slightly), then the cause is most likely a bad electrolytic capacitor. You might consider replacing all the electrolytics with bass-friendly Nichicon Muse or Panasonic TSH (or other low esr types) caps. Can't really tell you which one, and most likely there will be no physical/visual indication of failure. If you do see a cap that shows swelling or leakage, definitely replace it. If you are not familiar with electronics have a knowledgeable friend help. Good luck, Bob

30th September 2011, 11:49 PM	#6
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	What do you mean "the wire checks out"? Did you try a different guitar cord? And did you try this guitar cord with a different instrument? Intermittent connections and noises often won;t show up on ohm meters. Never assume. Is there a battery in that axe? If so, is it up to voltage? And wiggling it, does it make noise? (Loose battery clip)