By 1935 there was an exodus from acoustic phonos, and the shellac formulation had less abrasives. Still used steel needles, but with crystal transducers instead of mica diaphragms. Far less tracking pressure, but still barbaric by today’s standards. A record was a record- and that’s it!
Audacity used to have EQ curves built in- and thanks for that rabbit hole! I remember seeing curves for Columbia, Victor, and even acoustic, there was even an “inverse RIAA” curve. They’re gone now. For shits ‘n’ giggles, I went back to the iMac and opened the file hoping to nullify RIAA and apply the Victor EQ, but the curves aren’t there anymore.
I’d need a db/octave graph to recreate the Victor curve, but that’s a hole I don’t feel like crawling into right now.
Yes- the fixed pitch grooves are quite dynamic! Electronic tube amplification in recording began about 15 years before home phonos had tube amps, whether EQ was applied is a mystery to me.
Correct me if I’m wrong in any of this- INCREASE MY KNOWLEDGE!
EDIT: IIRC, the “V.E.” in the runout of Victor records denotes electronic recording.