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older LPs - different EQ?

After seeing 35,000+ LPs in one place on Sunday, including a wide variety of selections from the early years of recorded music, I suddenly remembered a foggy thing that I read a while back, and I want to confirm.

My impression is that pre-1958 or so (1955?) the record companies used a different equalization curve than the now-ubiquitous RIAA equalization. Is this true? If so, what sort of phono stages do equalization for these properly? Anything else to be aware of in this space?
blw
jrd351
332 posts
 
i think the curve on the lp(33.33rpms) has been the same since the beginning...i wouldn't worry about it.
twl
3,251 posts
 
There are some different eq. curves in the older records. Columbia, Decca/London, another one that I can't remember, and the current RIAA. And yes there are some phono stages that have selectable curves that are built-in. Don't ask me to name one, but I know they are out there, because I have read about them.
inpepinnovations1e75
395 posts
 
My Marantz 7T (as did the original tube 7) had three different EQ curves on it, one if I remember well was a Columbia curve and also a different curve for '78s.

Bob P.
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