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60 cycle hum fishman powerjack - Fishman Powerjack End Pin Active Acoustic Guitar Preamp

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Loud hum when I turn master above 2

Assuming there isn't an instrument plugged into it when it's humming, it will be time to have it recapped,

Oct 06, 2016 | Fishman Loudbox Mini Acoustic Guitar...

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Fishman loudbox mini american power to aust power

I'm not as familiar with Fishman products, but you might find your answer on this forum:;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.

Good luck!

Jan 13, 2013 | Fishman Loudbox Mini Acoustic Guitar...

1 Answer

How to tune Fishman Prefix Premium blend

If it is the standard ISYS try


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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

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 and parts too.

Feb 05, 2012 | Fishman Loudbox 100 Acoustic Guitar...

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I have a fishman tele power bridge and one of the trandsducers, the A string, is not as loud as he other strings.And it seems to always have a buzzing problem.Not humming,but more like the strings is to...

I would first investigate if the string itself MAY have a problem. If the strings are old, say over a year, try a new set. The only other likely cause of the problem is the setup of the unit.

Oct 31, 2010 | Fishman Powerchip Preamp

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