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HI! I am about to learn to find the general correct turnover and rolloff curves for US and European 78 rpm records. So far I have learned: US 78 rpm records: Pre. 1938: turnover 500 (RIIA), rolloff FLAT After 1938: turnover 500 (RIIA), rolloff -5 European 78 rpm records: Pre 1938: turnover 300, rolloff FLAT After 1938, turnover 300, rolloff -5 Can anybody share their experiences within this matter, please? All the best Jan Myren