Fidelity Research 64s vs Jelco SA-750e

I’t’s hard to beat a 64fx or 64S for Koetsu. I once had an opportunity to buy the Koetsu-branded arm for a good price, but passed because it was a Jelco build, and my FR64fx (mounted on a SOTA Star btw) was so obviously built to a higher quality standard.

Now I have a 64S too, on a different table. And many Koetsu cartridges. If you’re a Koetsu lover - just get an FR. Koetsus sound more alive and dynamic on an FR than with the other arms I have (Graham Phantom Supreme and Clearaudio Universal, the latter being an awful pairing). Any hint of sluggish, syrupy sound, missing treble, and/or soft bass disappears with the FR. You get even more of the "midrange magic" - vocals are shockingly palpable. And the depth of the stage expands, too.

That said - the FR64fx is a heavy arm for the SOTA. They can accommodate up to 2.5 lbs, and the 64fx runs 2.2. The 64S is heavier and may or may not work - you’ll want to check on this first. A SOTA definitely won’t work with a B-60 base; my 64S w/ B-60 weights in at 3 pounds!

The Star III with 64fx and an old Onyx Signature was what made me fall in love with Koetsu.

And yes - you can toss the stock FR head shells. Some are OK, but you can do better. 

You could also look at the Jelco 850 if you can fit a 9" arm on it. Lots better than the 750. 

Great thoughts. Thank you. I had not thought about the weight of the ard the Sota suspension! Good warning...

The FR-64s without B-60 base (vta of the fly) is not so good.
I have’t tried the N-60 stabilizer

But 64fx is good as it is, becase the arm base of the 64fx is much better than the arm base of the 64s.

So for the 64s you need the B-60 base which is optional and very expensive.
With 64fx you need nothing, but the right counterweight (heavy counterweight W-250 is optional and very rare!) 

I owned both the Jelco 750D (9-inch) and the FR-64S played with my RSP. The Jelco was tweaked with the old TTW VTA collar which, like the B-60 base, adds even more weight to the arm. The FR-64S was without the B-60 Base. Head shells were Yamamoto HS-4 (Carbon Fiber), HS-6 (Titanium) and Ortofon LH-8000 (Laquered wood).  
In my system, the overall difference was small with the edge going to the FR-64S.  The FR with the LH8000 had the best combo of bass extension, midrange beauty and extension on top. Perhaps the difference would have been even greater with the B-60 base but it was enough that I was happy to sell the Jelco and do not miss it. I think the difference is small enough that you can take your time to find the right FR-64 (condition wise) for your table.