Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into their Design

Direct recording is becoming commercially more and more important. Acetate blanks are used for high-quality recordings, but these materials are essentially softer than pressed records, and therefore make necessary new considerations in the design of high-quality pick-up to be used with them. — It is shown that a dynamic stylus pressure of approximately 25 grams is the maximum force that acetate can tolerate without permanent deformation of the modulated grooves, even when due consideration is given to the proper matching of stiffness and inertia of the vibratory system of the pick-up. — A simple formula is given for the most suitable condition of the matching of inertia and stiffness for a complex wave-form. Other factors that interfere with the construction of a light pick-up, such as uneven record and turntable surfaces, are explained, and suggestions are made for the reduction of these effects. — The advantages of “constant amplitude” as a method of recording and reproduction are shown, and a constant amplitude system is demonstrated.

Print ISSN

0097-5834

Published

1939-08

Content type

Original Research

DOI

10.5594/J11968