The MC30 was Ortofon's highest achievement before the arrival of MC2000, introducing some important innovations as mentioned by Raul. It was a real statement product that initially came in a luxury leather attaché case, complete with test record. In the Ortofon 100th Anniversary book it is mentioned that the MC20 which preceeded the MC30 was (co)designed by a young Japanese designer. The story goes that this individual was none other than Nakatsuka San, later of ZYX fame. Small world indeed!
The original MC30 was also a very low output device at 0.1mV (my sample is even lower at 0,09mV) and was probably as difficult to operate in the 70's as the MC2000 was in the 80's. All subsequent versions of MC30 (mk2, Super, Supreme) had higher output to make it more managable, just like subsequent models in the '000' series, but none sounded as good as the original version.
To my ears the original MC30, original MC2000 and MC7500 were the best Ortofon cartridges of the 20th century, until in this century new owners started a new phase of ultra high end designs with models like MC Anna and the A90 and A95 Anniversary models. These are extremily good systems, but their sonic priorities are more geared towards maximum information retrieval, consistent with what high end audio is all about these days.