Definitive info on pre RIAA EQ curves.

[PeteLeoni]

EQ is all over the place on different pre 50s electronically recorded records! Even on same label, sometimes from same era! No wonder they posted "For best quality on *X* machines use *X* records. Has anyone ever written a book on early EQ of 78s? It would be interesting. I just thought I had a hard time with my vinyl pressing guys in 70-90s. It was the wild west early on!

[Orchorsol]

I doubt ultimately there's such a thing as 'definitive' for older 78s, but this is my go-to:
http://www.shellac.org/wams/wequal.html

There's useful information and discussion here, including the statement " 78 EQ is a nightmare":
https://www.lencoheaven.net/forum/index ... ic=15133.0

I use a Graham Slee Revelation phono pre - lots of info here too:
https://www.hifisystemcomponents.com/ab ... cords.html

[PeteLeoni]

That is great! Perfect!
Thanks!!!

[Lah Ca]

Audacity had a thing going at one time with EQ Curve plugins. The links to the downloadable pre-fab plugins are broken. So maybe this project has been abandoned. There is some information here in tables, as well.

https://plugins.audacityteam.org/additi ... d-their-eq

[Lah Ca]

Interesting Stereo Lab article on playing 78s. It addresses EQ issues among other things.

https://pspatialaudio.com/seventy_eights.htm

And it has a link to this PDF file:

https://pspatialaudio.com/Pspatial_EQ_Guide.pdf