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In Reply to: Re: Hey Dave you nutcase posted by dave slalge on October 28, 2001 at 19:45:00:
"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
Follow Ups:
i dunno??? i was going by the post above... is this accurate???http://www.AudioAsylum.com/forums/tubediy/messages/465.html
dave
When the LP was developed, there were still multiple standards but they were soon consolidated into RIAA and a European standard which was the same as RIAA but with a subsonic filter. Short-lived LP EQ curves included the Decca standard, RIAA, and I think maybe two or three more. There were different, non-standard playback EQ settings in the 78 era. More info can be found in one of the reprints from Wireless World published by Old Colony Sound Lab, which contains a full-function preamp designed during the transition era with built-in switchable EQ settings. The reprint is:ITEM #BKAA27 $16.95 Mullard Tube Circuits For Audio Amplifiers
There is also more info in Morgan Jones, Valve Amplifiers.
I have a friend who transfers 78s for reissue projects and he has several variables to consider: playback speed (78s were not all cut at the nominal 78 RPM); stylus shape; stylus material; playback EQ. He has a table of EQ settings and speeds that MOSTLY work for each label but there are always exceptions.
In contrast, us LP-heads have it easy!
-j
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