Electrical playback of 78s

[drh]

...I don’t think that’s particularly accurate.

I’ve been a devotee of vintage 1950’s mono equipment for some time now. I don’t think RIAA became the standard until 1956. Especially with Decca’s ffrr eq.

I have collection of 10” Lp records like Westminster. Some of these are not mastered with a RIAA curve. And I’ve used the suggested settings on my KAB Souvenir Preamp.

Right you are--early mono LPs can vary considerably from RIAA. Remington, for instance, takes much sharper rolloff up top, presumably a deliberate choice to suppress the pronounced surface noise from the cheap material in which its records were pressed. Here is a chart that offers suggested settings for various early LP labels: http://www.shellac.org/slumber/equal.html

It references "dialing your discs," a chart put out by High Fidelity magazine at the time; that can be found here: https://pspatialaudio.com/dial%20your%20discs.png