Alongside this he introduced the lightweight tone arm and sapphire needle to turntables. Peter Goldmark, head of research at CBS-Columbia in the US, worked on 33.3 RPM 12” records with microgrooves that offered much better sound quality. The Royal Navy had invented wider frequency recording to track submarines, and 16” 33 RPM ‘V-Discs’ were a step closer to records. Technological innovations during World War II led to a leap forward.
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