Robin L's photo the Dual looks like it has a flip-over stylus. That would indicate a ceramic cartridge.
A "'modern" magnetic cartridge will give you much better sound, but perhaps not the "vintage sound" you're looking for. Ceramic cartridges have higher output (into a very-high impedance) and frequency response that roughly approximates RIAA EQ so they don't need a phono preamp. Tubes are "naturally" high-impedance so it was easy to have a compatible input in the tube days. (The ceramic cartridge won't work with anything "modern".)
I found
this about ceramic cartridges: