Discuss The Viv Lab Rigid Arm

Raul

 

 The underhung just has not that "perfect "equilibrium

Can you provide a list of underhung arms you have experimented with?

dave

Is there the possibility the Cart's Styli will have less wear from a Groove Side Wall when used on a Underhung Geometry Tonearm?

I ask this, as the anti skate is not required, hence the force that can be applied to a groove side wall, through Anti Skate Setting creep or inaccurate set up on a Overhung Geometry is no longer an impact on the Styli when used on a Underhung Geometry.

In relation to the value of some Cart's that are being purchased and mounted on a Tonearm, if a method used that is able to extend Cart' Life through lessened wear, and the TA > Cart' marriage is one the end user finds audibly satisfying. The notion that wear might be decreased, might be one more occurrence to add to why a underhung geometry is worth considering.  

Pindac, good question about stylus wear. We’ll have to wait and see; using theory, I could argue either side of that question in favor of either overhang with AS or underhang.

My experience of dealing with AS has left me to do the method where there is a eye on the Styli/Cantilever within the Groove at the Outer Grooves approx’ 5mm inside of the Lead In Dead Wax and again at the Inner Groove approx’ 5mm inside of the Lead Out Dead Wax.

As long as the Cantilever is seemingly to my eye not askew, I settle for that as the side force that is to work with said Cartridge. This is the one that seemingly transfers across a selection of Albums. As said in the past in my descriptions the Hole Centre Groove Misalignment when present has a Industry Standard that does not increase to more than 0.2mm.

As I have a interest in Cart’s Optimisation, I have quite a few years of observing Cart’s conditions, as a result of viewing images supplied by Third Party Services and others with a similar interest to my own for taking Macro Images and showing their own Cart’s. On numerous occasions I have witnessed Cart’s from a broad range of purchase values, that are with Cantilevers noticeably askew and off the Centre Line to the Cart’s Body.

I have the notion, this is a cause due to the Cart’s fragility in conjunction with incorrect AS being used at the time of Set Up, or AS Creep has occurred and has not been recognised to have occurred through a extended period of the Cart’s usage.

It does seem to me the cause of the askew, is usually outside of what a loss of set up for overall optimisation, or what any wear and tear issues developing within the Cart’s critical mechanical interfaces is able to create. I would also strongly suggest such off centred cantilevers are resulting in a excess of force being applied/developing, that is capable of causing uneven wear to a Groove Wall and a Styli. How much damage is occurring to the LP’s Groove Wall that is irreparable, is something I have not got the knowledge to comment on.

Is there any known situations where a user has reported back that a Cart’ with a In Line Cantilever, after a period of usage on a Underhung Geometry has been witnessed to have a Cantilever that is quite noticeably askew to the Cart’s Centre Line??

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Dear @lewm : Seems to me that you " die for " the skating force and nothing wrong with that.

Now, LT tonearms appeared for one main critical reason ( where skate develoved was not in that " equation ". ) that was and is that the mounted cartridge on it rides the LP grooves surface in "exactly " the same way that that LP recording was under the cutting head machine this is LT.

Audiophiles, me including, bougth the LT ( still today do. ) designs for that main critical reason and no one said or say: " I’m buy because no skating ", no one cares about because this is only an additional side LT tonearm benefit.

In the other side almost all the off-set angle pivot tonearms come with some kind of anti-skating mechanism that in some way or the other has the AS under " control " and no not " perfect " but those kind of designers try to put at minimum.

So, all overhang tonearm designs with Löfgreen alignments set-up are ( no matter what ) the second best " road " behind the LT and not the underhung that you like it or not is far away from there . The overhang tonearm designs are not with ZERO ( 0 ) AS, designers take care about in the best each one of them can and again not " perfect "..

R.