Robert Cowlin Introduction to Lacquer Discs 2 Also known as Laminate disc Transcription disc Instantaneous disc Acetate disc Directcut disc 3 Format Characteristics c1940 Frequency response ID: 1045023
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1. Signal Extraction fromInstantaneous Lacquer DiscsRobert Cowlin
2. Introduction to Lacquer Discs2
3. Also known as…Laminate discTranscription discInstantaneous disc"Acetate" discDirect-cut disc.3
4. Format Characteristics (c.1940)Frequency response:50 Hz – 8 kHz (dictated by cutting head)Signal-to-noise ratio: >50 dBSizes: 5”, 7”, 10”, 12”, 13”, 14”, 15”, 16”.4
5. Emelie Hooke lacquer disc collection5
6. Transfer Workflow6
7. Preparation7
8. Cleaning8
9. 9
10. 10
11. Before and After…11
12. Choosing the Stylus12
13. 13Jim Lesurf, Hi-Fi News
14. 14
15. 15
16. 16
17. Coarse groove styli17
18. Selecting a stylus without wearing out the disc…18
19. Equalisation19Peter Copland, Manual of Analogue Audio Restoration Techniques
20. Final preparation20
21. Capture21
22. Playback22
23. Further readingBeardsley, R. and Leech-Wilkinson, D. (2009). A Brief History of Recording to ca. 1950. www.charm.rhul.ac.uk/history/p20_4_1.html Copeland, Peter. Manual of Analogue Audio Restoration Techniques. The British Library.Fantel, Hans. “Fabulous Phono Cartridges: 4 Channels and 50,000 Hz”. Popular Mechanics, April, 1975.Guidelines on the Production and Preservation of Digital Audio Objects.www.iasa-web.org/tc04/audio-preservationLesurf, J. (2007). Around the Bend. www.audiomisc.co.uk/HFN/LP3/aroundthebend.htmlPhonograph Pickup Stylus. US3774918A. Victor Company of Japan, Ltd., 1973.Presto Instantaneous Sound Recording Equipment and Discs. New York: Presto Recording Corporation, 1940.Street, Sean. Historical Dictionary of British Radio. Lanham: Rowman & Littlefield, 2015.23
24. Thank youRobert.Cowlin@bl.uk@cowlin_robert24