The SL-1200 was not produced for DJ use. It became popular with DJ’s because it was a fully manual and build quality was above the others. Many moons ago I owned the semi automatic SL-1400 , it was nice but not in the same league as the SL-1200!
http://ajournalofmusicalthings.com/how-the-technics-sl-1200-became-the-most-popular-turntable-in-the...
http://ajournalofmusicalthings.com/how-the-technics-sl-1200-became-the-most-popular-turntable-in-the...