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MArkBass 250 black line fix??


BaggyMan
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One the disadvantages of trawling around the web and such is seeing something useful before you actually need it. 

So in the hope that someone on here has such information

 

I have a Jeff berlin combo with the 250 black line head in it.  The first head has a problem with the digital switching power supply issue which was pant wettingly expensive to replace /repair,  so I bought a second hand 'hardly used' one to swap it out .

 

All seemed well when i started getting a distortion in the signal and output.  I seemed to vaguely remember a fix that re-routes a cable away from the power or something which solves it.....anyone??

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