[duantro]

I recently got an Alec 639 birdcage mic that got dropped and the top got cracked. Does anyone know what the metal is on these? wondering if soldering would hold it, or epoxy would be the way to go. My wife is a jeweler, and has a micro welder, just not sure what kind of fill to use, if I went that route. I'm trying not to destroy it also! Thoughts?
http://www.coutant.org/altec639/

[ln76d]

I think this is alloy, if so, it can be hard to fix.

[EmRR]

there was talk of a 3D printed approach somewhere, I don't know if it was pursued.

[mjrippe]

Epoxy (JB Weld) is probably your best bet.

[Delta Sigma]

The broken top section will come off, right?

It's pretty safe to try epoxy if you can remove the piece. Use very little epoxy and remember that cure times increase with less epoxy so keep it clamped (or tighten that wire) for quite a bit longer than specified on the box.

[duantro]

Yes the top comes off. It is held together by two long screw that go through the top and sandwiches the middle section to the base., so it needs to be somewhat solid.

[dmp]

Are both elements working inside? Might be worth checking before putting effort into the metal repair.
I have one that has a dead dynamic element but the ribbon works. Did not appear possible to repair when I took it apart. Worth keeping just for the ribbon though.

[duantro]

Yes, both elements are working and it sounds pretty great.

[dmp]

Nice.  How does the dynamic element sound in these? Does it have a good bass response?

[duantro]

I just did a quick talking test with the different patterns to make sure it worked, but it sounds pretty close to the ribbon element in sonic character- nice and full.

[mjrippe]

Is it not the same omni dynamic element as used in the 633 "Saltshaker" mic?   

[duantro]

Is it not the same omni dynamic element as used in the 633 "Saltshaker" mic?

I believe you are correct.

[duantro]

there was talk of a 3D printed approach somewhere, I don't know if it was pursued.

I've tried a search and haven't found anything on this. Doesn't the cage do some rf shielding on most mics?

[EmRR]

I've tried a search and haven't found anything on this. Doesn't the cage do some rf shielding on most mics?

The later Altec 670 adaptations have bakelite bodies I believe, and I think an Amperite I have does as well. 

[dmp]

I've tried a search and haven't found anything on this. Doesn't the cage do some rf shielding on most mics?

The mic body would form a Faraday shield around the mic element. I think you could try lining a 3D printed body with copper adhesive foil.

[wlinart]

The mic body would form a Faraday shield around the mic element. I think you could try lining a 3D printed body with copper adhesive foil.

It's also possible to electroplate something 3D-printed. That will also help with some RF shielding.
Here's some help: https://www.youtube.com/watch?v=ilWst2zq-D4

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