Once LPs had settled on RIAA that was usually the only equalization circuit in the system, but there were some exceptions.
I have a Fisher (IIRC model 50C) that is a mono tuner/phono preamp and it had a few switchable equilization options I think they were RIAA, EUR, 78, and possibly something else...I don't do a lot of mono listening so that Fisher has been in the closet for a good 5-10 years now.
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