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It does use the 1 micron diaphragm (same driver as the Lambda Signature) and it says so right in the instructions manual. There is even a comparison chart between the two Sigmas.
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I had my Sigma pro's rebuilt from low bias Sigmas by Stax in Japan. I had some correspondance with them about choices of cable but not about transducers. I hope they used the proper transducer.
More recently I had another low bias Sigma modded by the American distributer using 404 transducers and cable.












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