Cartridge Opinions - Sorry

Hi rauliruegas.
I guess there's no-one on this forum that knows more than you.
Try not to patronize in every piece you post.

You are correct it is fundamental to retain the positional relationship between disc surface and stylus through TT and arm bearings with minimum free play.  If this is not achieved, the orientation of the stylus in the groove is allowed to vary, varying the signal in a manner not in the groove.

A properly engineered unipivot can do this.  Its advantage is the arm wand sits on a single point and is held down by its mass, preventing lateral movement in any direction, as long as the bearing does not jitter.

A gimbal set-up must always have some free-play in its bearings, otherwise the arm wand would be unable to move. Thus there will always be unwanted movement between arm wand and arm housing, however small.

A well-engineered air-bearing parallel tracker will do a better job than either.  It requires a high pressure air supply, not a fish-tank compressor.  Even though the tiny air gap in the bearing theoretically allows relative movement between its two elements, the high pressure in the space holds the air-gap constant between them..

Dear @clearthinker : Absolutely wrong. I'm only other audiophile with different ignorance levels than other gentlemans and I know not one but several Agoners with way higher knowledge audio levels than me.
I can see that you have high knowledge level and probably better than me. Good.

In the other side no one in audio knows everything about everything in all thousands of audio subjects. Certainly not me.

R.

A gimbal set-up must always have some free-play in its bearings, otherwise the arm wand would be unable to move.

This statement is false. If a bearing in a gimbal system is over-tightened the arm can still move but a lot depends on the bearing. At some point if tightened too much the arm will get quite stiff, and likely also the bearing will be damaged. The latter issue is far more profound with jeweled bearings, which is why they often have some slop to prevent damage. If a metal bearing is hard enough, this issue is overcome. The SME5 is a good example of this as is the Triplanar and I suspect there are others- its a big world out there.

Regarding the tonearms I just don't understand what do you mean. Because I've been using Technics most of my life and never had a miss tracking or something (and Grado DJ200i was on it for a long time).

Yes- I can imagine this is true- a friend of mine has the EPA-100 and I've not heard it mistrack. But just because this is so does not mean that the cartridge is actually tracking its best. But the difference is both audible and measurable.

Hi Raulruegas
Thank you for that.
Whatever knowledge I have has taken more than 70 years to acquire.

There is too much dogmatism here, as others have observed, but this is entirely understandable.  What we want to avoid is slagging one another off or alleging lack of knowledge in someone we have never met.  We can share knowledge and, indeed, opinions without that.

Sorry atmasphere, you are incorrect.  At least from a technical standpoint.  If it is not over-tightened then it is free to move.  If it is free to move then there must be an interference gap, however small, between the moving parts.  I don't think the hardness of the materials used has any bearing (ho ho) on the question.  As long as the surfaces are accurate and finely finished, their hardness will only affect the service life of the piece.

At least from a technical standpoint. If it is not over-tightened then it is free to move. If it is free to move then there must be an interference gap, however small, between the moving parts.

If so the runout can't be detected. I guess we'll just have to agree that we disagree on this point.