![]() In the past, I've fixed similar problems in electric guitars by shielding the inner cavity with copper tape. It's entirely possible that there was some sort of shielding problem on the previous wire, as this answer suggests, but I can't say for certain. I didn't have time to shield the wire - I can't get my hand all the way into the cavity of the guitar, and I don't have tools to work inside a guitar (outside of some skinny pliers and a small inspection mirror), so I elected to simply replace the pickup. The problem turned out to be either the pickup or the wire to the preamp. (I don't want to order a pickup, only to find the problem is the preamp or the wiring.)Įven better, could this simply be a shielding issue? Can the problem be corrected by shielding the electronics? How does one even do that with an acoustic guitar, by sheilding the interior cables? How I can go about diagnosing the problem? I'd like to replace as little of this system as I can. I've swapped the battery and made certain it's connecting solidly, neither made a difference. None of the wires inside are loose (I tightened up a cable that screws into the preamp, and that didn't make any difference), and all the soldered connections inside seem solid. So I've narrowed the problem down to the guitar electronics. (Or, if there were such marks, they've long since been worn off.) But here are pictures of the preamp and of the pickup: The preamp has no identifying marks, other than saying "Fishman Equipped". The guitar was subjected to no unusual stresses in that time, aside from being carried in the trunk of a car in the cold (but it was very well protected, in a hard case with nothing on top of the guitar). ![]() It's also worth mentioning that the problem came upon me quite suddenly, in-between two gigs about two weeks apart. Changing cables, mixers, amps - none of this makes a difference, the hum is still present. There's a continuous hum coming from the guitar, that mostly goes away when I grab the metal end of the cable jack, making me think that this is a grounding issue. ![]() I haven't been able to identify the type of pickup or preamp, although I have emailed both Fishman and Cort in an attempt to get more information. I have an acoustic guitar - a Cort MR750 dreadnought, from about 1998 - with a Fishman pickup system that came pre-installed in the guitar. ![]()
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