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Hi Valerij

Welcome to the forum. Vinyl record reproduction follows the RIAA curve for replay, which is the function of both audio amplification and impressing on that the inverse curve for RIAA replay. https://en.wikipedia.org/wiki/RIAA_equalization

 

The history shows Murray Crosby's invention of emphasis and de-emphasis very much directly involved, as prior to it, the LP record industry struggled with different equalization. Crosby's system, although not acknowledged,  enabled a flat frequency response for RIAA replay   Crosby is also tied to the invention much earlier of FM by Major Edwin Howard Armstrong, which with Armstrong's story is one of the most fascinating and tragic in electronic history. 

 

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Welcome, Valerij.

 

Very nice to see you here.

 

There is a Sansui amplifier owners thread here you will find comrades in arms there, generally a fair few members here are Sansui lovers.

 

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