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HumChaser

Chasing a 60hz hum, how do these solder points on the jack look?

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Hey there! 
I'm chasing down a hum on my old Takamine EG540C, starting with the output jack.  The hum goes away when touching the metal of the jack or the cable.  The giant glob of solder concerns me, but I'm so new to this that I frankly have no idea.  How does this look to you?

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sIi4tJU.jpg

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Looks fine to my eyes.

Maybe have a look at this video. Is your preamp and pickup similar to the one here?

At several points throughout the video he highlights some potential failure modes and fixes that can occur with the Takamine pickup assembly. 

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Thank you so much! I'll give it a watch and see what I can do. 

Yeah the soldering looked a little sloppy to me, but it is all firmly connected.  I was hoping it would be a simple solder fix, but I'll probably have to disassemble as he's done to diagnose it fully.

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On 7/21/2020 at 5:17 PM, HumChaser said:

The hum goes away when touching the metal of the jack or the cable.

a bad bridge ground is always the #1 suspect for that issue.

some other sort of "open" in your "negative bus" might also cause it. 

a bad bridge ground is just one possible open in the ground circuit (buzz when you touch the strings, but not when touching the jack).

there should be a ground path from the jack to the bridge, and from the jack to the pickups, through whatever controls you have.

 

Edited by norm barrows

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