After some weeks with Kuzma Safir 9 I like to share some observations:
1. VTF
The Safir 9 is very heavy! I never had a tonearm, which is changing the VTF so dramatically by the height of the scale.
It is obvious, that the VTF should be measured in the area of the center of gravity of the arm.
But with Safir 9 this is a mandatory must.
Putting the scale on top of a record or on the platter can make a huge difference in VTF. (2.45 versus 2.0 as an example)
In my case the scale is too high to show the correct weight, even if placed direct on the platter.
The AF3P has fortunately the rubber ring on a level a little below the platter, so with my scale I can measure now on the level for a 180g record.
The Safir 9 has 2 counterweights, a big one and a little one. So the adjustment is very fast and can be made very precise.
As with every tonearm, the counterweight has a resonance control / damping effect as well. So at first I found out, that the position of the 2 weights do matter in sound. But (in my case) more important is the effect to counter turn the 2 weights into each other, that they are fixed together, depending on the torque you apply, the resonance effect will change. With some carts you might prefer the 2 weights being separate, with the Aidas Mammoth the 2 weights should be strong together to get a sharper and more precise picture of the musicians in the room and to get the transients more precise
2. VTA
adjusting VTA has (for me) two side effects with Safir 9.
One effect , the obvious one, is, that you change the height of the centre of gravity, so your VTF will change, when you adjust VTA.
On Safir 9, this can become a significant change.
I preferred (in my set up) to keep the base of the Safir 9 in parallel to the record and to get the best VTF measure.
It seems, that having the zero level of the record surface in the same layer than the centre of gravity of Safir 9 is better for the performance.
The second effect:
To adjust VTA, you have to open the big tonearmbase screw , than you can turn the little screw to adjust VTA precisely.
This works good!
After having done this, you close the tonearmbase screw again.
But you still will find to have some force against the little adjustment screw.
In my set up this sounds a very little muddy and closed.
Open up the adjustment screw to not have any torque applied,
opens up the performance of the music reproduction a little more.
I definitely makes fun to try to understand the Safir 9 better and better over the time