A new, improved Master recording disc is being produced by advanced manufacturing facilities and techniques. The erratic quality heretofore common to lacquer discs has been eliminated. The new flatter disc surfaces fulfill the ever increasing demands of stereophonic and fine line cutting. A description is presented of manufacturing improvements, quality control procedures, and comparative test data against out-dated discs.
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https://aes2.org/publications/elibrary-page/?id=612
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