Hiss in LDC -mic

vlh · Post by **vlh** » Sat May 09, 2009 3:35 am

I?ve got an old ULS which sometimes makes quite audible hiss... Stops by tapping the mic gently. Also stops if I change the polar pattern back and forth with the switch. Any quesses what would be the cause? The diaphgrapm isn?t in very good condition anymore (dusty and even lacks small piece of the gold coating). Might the exchange of the capsule cure the hiss- problem or is there something broken in the electronics?

Brian · Post by **Brian** » Sun May 10, 2009 10:26 am

dirty connector, cable, or switch, clod solder joint.

vlh · Post by **vlh** » Sun May 10, 2009 10:54 am

Brian wrote:dirty connector, cable, or switch, clod solder joint.

You think that dirty and aged capsule can?t cause that kind of symptoms? I already tried cleaning the switches and the xlr-connector without success.

Brian · Post by **Brian** » Sun May 10, 2009 2:10 pm

I wouldn't think it would be hiss, either sound or no sound and maybe everything in between, but, I wouldn't think hiss. Of course, I could be wrong. Maybe some other capacitor in there is going bad or has a loose joint, could be a cold or fractured joint on something that old too. Now if you're looking to change the cap anyway, why not.

mixedupsteve · Post by **mixedupsteve** » Sun May 10, 2009 5:26 pm

Sounds like a bad connection or solder joint to me too. I don't see how flipping the switch would help if the capsule was bad.

vlh · Post by **vlh** » Sun May 10, 2009 9:03 pm

Just tested the mic again and the hiss now seems to have become constant. Any ideas how to trace the broken component or joint?

http://www.akg.com/mediendatenbank2/psf ... f992e6.pdf

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Hiss in LDC -mic

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