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PRF members' tech journal

All your geeky questions about electronics, microphones, tape machines, etc.

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Re: PRF members' tech journal

Postby JohnnySomersett on Thu Nov 23, 2017 4:23 pm

Nate Dort wrote:DONE!

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Hubba hubba!

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Re: PRF members' tech journal

Postby Nate Dort on Fri Jan 19, 2018 3:52 pm

Nate Dort wrote:Borked sennheiser 441 on the way. Something apparently rattling inside. Guess I get to perform some surgery on one of these for the first time.


Got it yesterday. It passed audio, but was quiet and thin sounding. No lows.

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Opened it up and the capsule assembly was rattling around inside. The plastic had broken at the thinnest part, near where it threads into the silver tube that houses the transformer/filter PCB. I've seen stories of broken PCBs in these things, so it opened the silver tube and didn't see anything suspect in there.

Then I hooked the capsule directly to an XLR and plugged it in to a preamp. Still thin sounding. I bumped the plastic horn thing in front of the capsule and it sounded good for a second. Tugged it a bit more and that seemed to fix the low output and thinness. Apparently that plastic horn assembly was slightly touching the capsule and damping the movement.

I epoxied the broken piece of the capsule assembly back on and reassembled. Sounds good now.

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Re: PRF members' tech journal

Postby Mason on Fri Jan 19, 2018 5:02 pm

Thanks for sharing that, Nate. I've got a 441—technically a 541 "Black Fire" model—that not only has a rattly capsule, but is lacking in low end. I got it for free so I wasn't too heartbroken, but it's good to see that this might not be the end of it.
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