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New Factors in Phonograph Preamplifier Design

An investigation into why various phonograph preamplifiers sound different has produced some new measurement techniques which correlate well with subjectively observed differences. A preamplifier design which performs well on these new tests as well as on conventional ones has evolved. Closely matched A-B listening tests have been performed, and, in general, the unit which measures better does sound better.

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JAES Volume 24 Issue 4 pp. 263-270; May 1976
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AES - Audio Engineering Society