Proper restoration of historic disc recordings is assisted by an accurate knowledge of the characteristics of the equipment used in the recording process. This paper traces the evolution of electro-mechanical disc cutting heads from the early 1920's to the last models. Use is made of the electro-mechanical equivalent circuits to analyse the performance of moving iron, moving coil and motional feedback types.

Author: Davies, Sean
Affiliation: S.W. Davies Ltd. Aylesbury, UK
AES Convention: 114 (March 2003) Paper Number: 5751
Publication Date: March 1, 2003
Session Subject: Automotive Audio; Instrumentation and Measurement

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