You’ve got a nice system of high quality, so I suspect you would hear and appreciate the difference between the two tonearms. Not that there is anything wrong with the Jelco. The Koetsu would also benefit from any added effective mass, since I suspect the FR64S is higher in effective mass than the Jelco. So in that regard, it’s a win-win. Whether all this amounts to $1300 of happiness, only you can decide, and unfortunately you have to take the leap in order to know for yourself. But think of it this way: If you buy an FR64S, you most likely can get all your money back should it disappoint you, which I doubt will be the case. I recommend an aftermarket headshell with the FR64S, not an FR headshell. I use an Ortofon LH9000 (18 grams) with my Koetsu Urushi, and the Urushi never sounded better. My FR64S constantly surprises me with all sorts of cartridges, high and low compliance, but in fairness, I've not heard the Jelco in my own system.
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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.
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.