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AR 3 tweeter' s broken wire


Sonnar

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A friend send me an AR 3 tweeter with a broken wire. Damn it, just close to the dome. He asked me if it's possible to repair this speaker . Maybe I could re-solder the wire to the moving coil disassembling the magnetic pot? He has sent me only the tweeter and not the AR 3 speaker because he lives in Genova, very far from Rome. Any suggestions will be helpful! Thank you, Adriano

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Looks like a difficult repair. Perhaps you should consider some conductive epoxy (http://www.mgchemicals.com/products/adhesives/electrically-conductive/silver-conductive-epoxy-8331/ ) instead of solder. Do I see a short piece of wire sticking out near the outside of the dome?

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Thank You der. I'm not able to detect the breaking point because I don' t see the wire outside the dome. There are white dots like corpuscles or glue drops . I restored many AR midranges and tweeters, but this one is awfully difficult! post-116698-0-01451400-1415300368_thumb.

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This is a common point of failure for the AR-3 tweeter, especially if the lead-out portion of the wire is not looped properly. This is a fatigue failure, and the aluminum wire is brittle. Sometimes you can take a small pick or point of a sharp knife and dig around the wire that is protruding, and you can then loop it slightly and crimp or solder the other end to it. I have done this two or three times, but not always was it successful. It's worth a try.

—Tom Tyson

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Thank You, Tom. Yes, it' s worth a try! At present my friend uses a pair of AR 3a tweeters, but You know , all original is better. And, forgive me, AR 3's tweeter gives more sparkling highs than AR 3a's ......

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Whatever has caused the breakage certainly done a perfect job in hidding the slightest hint of the wires.

Maybe a good magnifying glass and a multimeter with needle pointed probes and with a bit of patience can resolve this mystery.

Don't know what else to suggest with my limited knowledge.

David.

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I 've used a magnifyng glass to individuate the wire and I made a welding with aluminium wire, but the tweeter is still persistently mute. AR 3's tweeter is built in a very bizarre way and it' s delicate. God bless compression drivers, simple, robust, eternal. If only it sounded less rugged.

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Yes David, the tester shows no conduction, as if the voice coil were interrupt . My friend told me that the seller has messed up the original crossover, probably exposing the tweeter to some low frequency. Maybe it could be burned the coil. Thank you, David, my best regards. Adriano

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