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There's only one RIAA equalization for phono

"multiple riaa schemes in a single phono pre??? never heard of that one... "

RIAA standardized the equalization for phono. Before that every major recording company did its own equalization and sold the phonographs with their equalization scheme built in. All of these were mono records, mostly 78's. Later some preamps built "universal equalization", a switch to the one you needed. kind of like "universal digital players" today. RIAA stepped in and created the standard we live with today. There were no "multiple RIAA schemes." Early records will often be labelled with the RIAA logo on it to tell you it's equalization was for the new standard.

Kurt


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