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You may find what you are looking for using the search string "recording playback equipment and cartridges history" *Trescott Research - Paul T. Jackson * 2503 Natalie Lane, Steilacoom, WA 98388 http://www.trescottresearch.com <http://www.trescottresearch.com/> Support Authors: https://www.plateauareawriterassociation.org/ Support Musicians http://www.gatewayconcertband.org <http://www.gatewayconcertband.org/> On 11/1/2019 10:28 AM, 6295LARGE . wrote: > Hello > > Can anyone tell me > > When were the magnetic and ceramic cartridges invented? > > Were orthophonic recordings using microphones? > > When did phonographs start using speakers instead of horns? > > > Please send answers to [log in to unmask] > > > Thank you. > > Ben Roth