Grace, Pioneer, Audio-Technica, Victor used beryllium cantilevers in their top of the line cartridges, then it was prohibited and Boron became the top choice. I’m not trying to say that beryllium is better than Boron, but Beryllium is definitely better than Alluminum or Titanium.
Density (gr/cm): 1.84 Beryllium / 2.69 Aluminum / 4.54 Titanium
Young Modulus (kg/mm): 28,000 Beryllium / 7,400 Aluminum / 11,000 Titanium
Velocity Of Sound Propagation (m/sec): 12,600 Beryllium / 6,420 Aluminum / 5,990 Titanium
Most of these cartridges are very difficult to find in good working condition and are expensive. Best for OP to get either a modern Ortofon MM or modern Audio Technica MM.
Yes, but i have spare in perfect condition, not only me, but many audiogon user have them. For example the Audio-Technica
AT20SLa is about 350 euro with shipping. This is amazing high compliance cartridge. If you think the modern AT is better just read this:
https://www.vinylengine.com/turntable_forum/viewtopic.php?f=19&t=100109AT-Ml170 is also available along with NOS Victor X-1 if anyone interested, just PM me. Time machine in action!
Different engineers and cartridge designers are working in the companies like Audio-Technica, people who designed cartridges in the 70s are retired, new people are woking on the new cartridges. The situation on the high-end market today is way different than in the 70s/80s. New cartridges are not always better, sometimes it’s compromise, especially when we’re talking about Moving Magnet cartridges, the trend today is MC, not MM.