Fidelity-Research tonearm like the FR-64fx is one of those great vintage tonearms anyone can use today, the arm can be used with high compliance cartridges with stock counterweight and with low compliance cartridges with optional W250 heavy counterweight. Dynamic tracking force is a super user friendly feature. With an additional N60 stabilizer nut the performance can be improved. This is really amazing in my opinion. You must be an annoying snob to not like the FR tonearms, especially the latest FX series from the 80’s, the FR-66fx is the best of them (predecessor of the IKEDA 407). Any FX tonearm is better than 64s, because the common problem for 64s is dried up grease in the VTF mechanism and in the arm lift. Also the base of the 64s is a joke, compared to the base of the FX series. So the 64s is much harder to find in a good condition simply because it’s older tonearm, but after replacement of the arm lift and arm base (with B60) it’s a great tonearm!
The first bunch of IKEDA tonearms also have stainless steel arm tube. Never triend the latest IKEDA, but old from the early 90’s are amazing. It’s a rock solid tonearm, I love my IT-345.
For the owners of the mighty FR-7f, FR-7fz and IKEDA cantilever-less LOMC cartridges those are the best tonearms. And this combination will give you the sound of Ikeda. People who don’t like this sound are from the parallel world for me (I wouldn’t take their thought seriously), because the FR-7f + FR-66 fx is mind blowing combination in direct comparison to a dosen of vintage and new tonearms and cartridges.
I never tried the 66s, but I believe it’s stunning.
I love the 66fx in my system and I would be happy to find an early version of the Ikeda IT-407 for a good price.