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Fishman Loudbox LBX-001 Bad Capacitor

I have a Fishman Loudbox Pro (LBX-001) Fishman tech tells me the distortion (at all volumes) that I am hearing is likely due to a bad capacitor. I would like to fix it. Any insight into this particular product or schematics that I can glean?

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Posted on Jan 02, 2017

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SOURCE: My Fishman Loudbox 100 bass speaker buzzes- what

It is a poor ground but it is not necessarily in your amp.
If it is only buzzing when you have a guitar or other piece of equipment connected try a new lead cable.
If it buzzes all of the time......remove the cover at the rear of the amp and remove control panel.
Inspect the feed line to the input. If it is loose or broken....repair or take to have repaired.

Posted on Oct 12, 2009

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SOURCE: The reverb (or any effect) on my Fishman Loudbox

If you have a pedal input, you may be getting FALSE trips of this.

You may have a pedal jack with switch that is marginal.

TRY putting a pedal into the effect pedal input IF your unit has that and SEE if it acts stable.

These jack and jack switch problems are a pain on all these amps... any brand.

Posted on Feb 01, 2010

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SOURCE: I have a Kurzweil Mark-Pro

I don't know what you "tested" the power supply board with, but I would use an oscilloscope to look at the outputs to see if any of the regulators are drooping. Clicking is a broad term... if it is a relay, it PROBABLY is for speaker protection and senses balance of the power amps.
With a two minute delay, this is PROBABLY a thermal issue... Use freeze mist/circuit cooler to find suspicious parts.

Posted on Jan 02, 2011

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SOURCE: Mixer does not sound "clean"; almost distorted

If more than one input is bad, then problem has NOTHING to do with the preamps. Check list:
1. Make sure you are using BALANCED lines everywhere... either XLR or TRS cables.

2. Make sure ALL interconnected equipment, mixers, amps, powered speakers, CD players, etc. are ALL powered from the SAME receptacle or power distribution unit.

3. Do proper setup. Select each channel PFL and set the trims so the indicator never goes into clipping, but is in the 70% range during max volume input to mics, etc..

4. During operation the sliders should be at least 50% up on used channels and the mains. Setting of levels throughout the system is important for noise free operation. Using EXCESS gain at some point results in distortion and noise. Using sliders near the bottom position results in poor signal to noise ratio.

Now re-read #2 above... and believe it. I have seen a lot of equipment blown due to ground bounce of building power. That is why the pro's run power back to their mixer from the area where the amps are powered.

Posted on Apr 30, 2011

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SOURCE: I have a new fishman

Does it make the noises at higher gains with nothing plugged in? If not, check your guitar cables and connectors.

Posted on Jul 11, 2011

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Either the speakers have loosened from the faceplate, or one or more have blown. Open the amp and tighten them down. If that doesn't fix it, remove them a take them to the nearest speaker repair shop for a checkup. If blown either have them re-coned or replace them.

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I'm not as familiar with Fishman products, but you might find your answer on this forum: http://www.acousticguitar.com/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=1;t=030507

Remember to be VERY specific about the problem, what you WANT to work, and what is NOT working as a result of your purchase.

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What's your problem?I have two Fishman amps.The older Loudbox 100 single channel and a Loudbox mini. I am trying to find the service manual for the older fishman as I have a fault with it and the


Fishman iis you best bet http://www.fishman.com

You can download the user manuals, they do have a block diagram, but the scan is pretty bad.

It may end up the person looking at it is going to need to rely upon their general knowledge.

My own suggestion is to pull the chassis out so you can work on it while powering it. And then work your way through the amp with either a signal source plugged in at the input, and with high impedance headphones with test lead ends, go through each audio stage carefully. until the fault is isolated. If it is not caps or the rectifiers in the power supply, faulty ground connections to chassis or faceplate, a faulty 4558 is most probable. The headphone approach is the fastest way to address this last one. If a different series of preamp chip is used, a good source for the IC datasheets in general is Digikey http://www.digikey.com and parts too.

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I have seen defective XLR cables so check it with an ohmmeter. It is possible the mic input preamp has been damaged. If that is the case, the unit will have to be repaired.

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Very low volume from mic input even with Gain and Master turned full on


You haven't told us what type mic you are using. If you are trying to use a condensr mic with this, you will need a preamp that supplies Phantom power to the mic. You haven't told us what cable you are using. Do check that you aren't using a condenser mic as there will be virtually no volume.

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I don't understand your question. The "Aux in" is just that an input that goes to the power amp. Please note that the Fishman Loudbox does NOT have a headphone jack so don't be disappointed as there plain isn't a headphone jack on this unit. I would recommend that you get a small headphone amplifier for the purpose... or even go to a thrift store and get an old stereo system that has a headphone jack and use that.

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1 Answer

The fuse blows right away. How do I isolate this problem?


Unplug all cables, turn all gains and volume to zero and switch on. If the fuse still blows I'm afraid it has a power supply fault and will need repairing by a tech.

Also, make sure it is a T-type or slow blow fuse of the correct rating. Ensure that if a mains voltage selector exists that it is set for your local mains voltage.

May 27, 2011 | Fishman Loudbox 100 Acoustic Guitar...

1 Answer

The reverb (or any effect) on my Fishman Loudbox 100 has become unreliable. It goes in and out randomly.


If you have a pedal input, you may be getting FALSE trips of this.

You may have a pedal jack with switch that is marginal.

TRY putting a pedal into the effect pedal input IF your unit has that and SEE if it acts stable.

These jack and jack switch problems are a pain on all these amps... any brand.

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