ADC's FIRST PHONO CARTRIDGES 

1961. A comparison of ADC's first cartridges. While other cartridge companies began manufacturering in the 1940s and 1950s, ADC started in 1961, The models were premium quality with ultra high compliances and low tracking forces. Even the base model surpassed other manufacturer's top models. And while cartridge series usually consisted of a single cartridge body with a variety of different stylus assemblies, ADC's first models were all different cartridges with coils tuned to match the different stylus assemblies. The problem with these models was that the majority of turntables and tonearms were not comapatible with their high compliance and low tracking forces.