I found out that you cannot just get a player with 3 (or variable) speed settings as you require specialized cartridges.
you need Technics Direct Drive SL1200GR if you want to play 78 and 33/45 on the same turntable with ease.
A specialized cartridge can be just specialized stylus, Stanton and Pickering made them all (for all formats: stereo, different mono, 78 etc ... )