Uni-Protractor Set tonearm alignment

Dear Genesis168, sure enough Stevenson was not stupid - nor for certain is Harry Weisfeld. Both knew/know what they are doping and why.
BTW - Stevenson did in his calculation put the 2nd zero tangential error point ("null point") right at the DIN - respective IEC - cutting limit (i.e. innermost grooved area).
So the tracking distortion due to tangential error is always zero at the theoretical innermost groove.
This is per Stevenson's definition.
At this very same point Löfgren A is approx. 600% (6x) more distortion and Löfgren B is approx. 1000% (10x) higher distortion ( based upon that Stevenson is still say 0.1% tangential error distortion and not really zero ).
Löfgren did "sacrifice" the the inner groove for lower distortions between the 2 zero points.
This works especially well with shorter tonearms (9") and with records with long lead out groove.
He did not took into account stereo and did not dream about what wide-cut LPs some record companies would put out in the late 1950ies and 1960ies.
Many japanese audiophiles with 12" tonearms do align to Stevenson and for - again - very good reason.
With increased effective length of a given tonearm (especially so if the tonearm gets really long .. 11" and more) the Stevenson alignment's curve get's better and better vs Löfgren A (Baerwald) and Löfgren B.

In mountaineering you can usually choose between several routes to climb a mountain. Depending on your skills, periphery conditions, preference and experience. Each route has it's benefits and trade-offs.
Some do accept only the first, old and marked route and some do look for new routes.
Same here.
Cheers,
D.

Travbrow :
"A tracing arc with a specific distortion curve should have the same geometric error and distortions regardless of the arm, cartridge stylus or if the record is stereo or mono, I thought? "
Good question!
With our restricted knowlege till now, this is a fact.
So, what is going on with Daniel's proximity ?

If those 0 points mark the places whitout any distortion
why are we not able to hear them? One should akspect some
special (Aha!)feeling 'around' them. I myself would ply
only those parts on the records because my aim is perfection.

Regards,

We all, I think, recognaze the individual right of belief
in our own hearing. So anybody is entiteld to believe in
his own ears. But to ekspect that anybody else should believe in your hearing is something totaly different. So
no wonder that only some of us use the VPI tonearms.
Regards,

Dear Nandric,

"reducing the complexity means to me not being able to deal with it"

not necessarily. reduction of complexity was and is sometimes a way of gaining new insights - one will believe or not. And it is also a survival pattern in some difficult situations enabling the individual to cope with it.

Of course you are right the psychological implications are also evident when it comes to results being feeded by personality habits avoiding or defending actions. You may conclude from special communication styles and patterns if the individual is able to deal with complexity or not, mostly using only one or two special behavior patterns showing over time. In this way most of us are not very well trained or prepared dealing with complexity.

thanks for your compliments. You are right I am a very optimistic person but having gained experience about "the real world" I do think that we need controversial discussion to some extent. This is what makes it different to the glossy magazines.