Dear @chakster : Your logic about those cartridges with diferent color has no sense to reklated to tonearms for it.
Both cartridges are diferent: has diferent output levels. The 64fx appeared at the begening of 1980, the 66fx in 1981 and the 64fx pro in 1984. The black body cartridges started at the end of 1980.
Anyway , I know that you like to live in that " audio world " a wrong/dark one but is your choice. Too much to learn, me too.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
Both cartridges are diferent: has diferent output levels. The 64fx appeared at the begening of 1980, the 66fx in 1981 and the 64fx pro in 1984. The black body cartridges started at the end of 1980.
Anyway , I know that you like to live in that " audio world " a wrong/dark one but is your choice. Too much to learn, me too.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.